Respiratory muscles: structure, function and relationship with the ACE gene: a brief morphofunctional communication / Músculos respiratorios: estructura, función y relación con el gen de la ECA: una breve comunicación morfofuncional

SUMMARY: Pulmonary ventilation is a mechanical process in which the respiratory muscles act in coordination to maintain the oxygenation of the organism. Any alteration in the performance of these muscles may reduce the effectiveness of the process. The respiratory muscles differ from the other skeletal muscles in the vital support that they provide through rhythmiccontractions. The structure and energy system of the muscles are specially adapted to perform this function. The composition of the respiratory muscles is exceptional; they are small, and present an abundant capillary network, endowing them with a high aerobic level and resistance to fatigue. Coordinated regulation of the local renin-angiotensin system provides proper blood flow and energy supply in the myofibrils of the skeletal muscle tissue. Specifically, this performance will depend to a large extent on blood flow and glucose consumption, regulated by the renin-angiotensin system. The angiotensin converting enzyme is responsible for degrading kinins, which finally regulate muscle bioenergy and glucose between the blood vessel and the skeletal muscle. The objective of this review is to describe the structure of the respiratory muscles and their association with the angiotensin converting enzyme gene.

La ventilación pulmonar es un proceso mecánico en el que los músculos respiratorios actúan coordinadamente para mantener la oxigenación en el organismo. Así, cualquier alteración en el desempeño de estos músculos puede reducir la efectividad del proceso. Los músculos respiratorios se diferencian de otros músculos esqueléticos, debido al apoyo vital que brindan a través de sus contracciones rítmicas. La estructura y el sistema energético de estos músculos están especialmente adaptados para realizar esta función. La composición de los músculos respiratorios es especial; son pequeñas y presentan una abundante red capilar, lo que les otorga un alto nivel aeróbico y resistencia a la fatiga. La regulación coordinada del sistema renina-angiotensina local, proporciona un adecuado flujo sanguíneo y suministro de energía a las miofibrillas del músculo esquelético. En concreto, este rendimiento dependerá en gran medida del flujo sanguíneo y del consumo de glucosa, regulado por el sistema renina-angiotensina. Aquí, la enzima convertidora de angiotensina es responsable de degradar las kininas, que finalmente regulan la bioenergía muscular y la glucosa entre el vaso sanguíneo y el músculo esquelético. El objetivo de esta breve comunicación es describir la estructura de los músculos respiratorios y su asociación con el gen de la enzima convertidora de angiotensina.

Respiratory muscle sequelae in young university students infected by coronavirus disease 2019: an observational study

SUMMARY BACKGROUND: The infection caused by coronavirus disease 2019 can lead to respiratory sequelae in individuals who have experienced severe or mild symptoms. METHODS: An observational, cross-sectional study was developed, following the STROBE guidelines. Maximal inspiratory and expiratory mouth pressures were assessed in 50 healthy young students (26 women, 24 men; age 22.20±2.41 years). The inclusion criteria were as follows: aged between 18 and 35 years; control group: not diagnosed with coronavirus disease 2019; and coronavirus disease 2019 group: diagnosed with coronavirus disease 2019, at least 6 months ago. The exclusion criteria were as follows: obese/overweight; infected with coronavirus disease 2019 or coronavirus disease 2019 symptoms in the last 6 months; smokers; and asthmatics. RESULTS: When comparing with groups, the coronavirus disease 2019 group presented statistically significant lower maximal inspiratory pressure values compared with the control group (88.32±16.62 vs. 101.01±17.42 cm H2O; p=0.01). Regarding the maximal expiratory pressure, no significant differences were found. Similar results were found when performing a subgroup analysis by sex and group. CONCLUSIONS: Young students who suffered from coronavirus disease 2019 asymptomatically or mildly at least 6 months ago presented a significant decrease in the inspiratory muscle strength as a sequel, so we believe that patients affected by this disease should have a brief postinfection assessment of this musculature to detect the indication for cardiorespiratory rehabilitation.

Fisiología respiratoria: el control de la respiración / Respiratory fisiology: the breath control

El control de la respiración comprende un componente automático involuntario y un componente voluntario, con centros de control en el tronco encefálico, principalmente en la médula oblonga y en el puente, y en la corteza cerebral. Estos centros reciben aferencias provenientes de sensores que detectan señales químicas y no químicas, interactúan entre sí y generan respuestas que llegan a las neuronas motoras inferiores a nivel de médula espinal. Estos procesos determinan el funcionamiento de los músculos implicados en la respiración, y de ese modo permite garantizar que los niveles de pO2 p CO2 y pH en la sangre arterial se mantengan en forma óptima, frente a diferentes situaciones y demandas metabólicas. Se hace una revisión actualizada del tema que permita comprender estos procesos.

The control of breathing comprises an involuntary automatic component and a voluntary component, with control centers in the brain stem, mainly in the medulla oblongata and in the bridge, and in the cerebral cortex. These centers receive afferences from sensors that detect chemical and non-chemical signals, interact with each other and generate responses that reach the lower motor neurons at the spinal cord level. These processes determine the functioning of the muscles involved in breathing, and thus ensure that the levels of pO2 p CO2 and pH in arterial blood are optimally maintained, in the face of different situations and metabolic demands. An up-to-date review of the subject is carried out to understand these processes.

Oxigenación de músculos respiratorios y locomotores durante el test cardiopulmonar en pacientes con circulación de fontan: serie de casos / Patients with fontan: oxygen consumption in respiratory and Locomotor muscles during excersie testing

Resumen: Antecedentes: Los pacientes con circulación de Fontan (PCF) presentan limitación cardíaca durante el esfuerzo máximo lo que repercute en menor capacidad de ejercicio (VO2-peak). La rehabilitación cardiovascular (RC) revierte este desacondicionamiento, al aumentar el gasto cardíaco y diferencia arteriovenosa de oxígeno, aspectos evaluados con monitorización invasiva y gases exhalados. La valoración no invasiva de la saturación muscular de oxígeno (SmO2) es un método de reciente aplicación para evaluar la limitación muscular al ejercicio. En PCF esta limitación puede atribuirse a la mayor acción de músculos respiratorios (cambios ventilatorios) y/o locomotores (carga periférica). Objetivo: Evaluar el trabajo de músculos respiratorios y locomotores durante el ejercicio físico máximo e incremental mediante los cambios en la SmO2. Métodos: A seis PCF (5 hombres; 13.8±2.9 años; 158±9cm; 49.8±13.3 kg) se les valoró el VO2-peak (23.0±4.5mL·kg-1·min-1) mediante ciclo-ergoespirometría sincrónicamente con SmO2 en músculos respiratorios (SmO2-m.Intercostales) y locomotores (SmO2-m.Vastus-Laterallis) mediante espectroscopía cercana al rango infrarrojo durante el test cardiopulmonar. Resultados: SmO2-m.Intercostales disminuyó desde el 60% del VO2-peak (p<0.05), mientras que SmO2-m.Vastus-Laterallis no cambió. La ventilación pulmonar (VE) aumentó progresivamente, siendo significativo a partir del 60% VO2-peak (p<0.05). La mayor desoxigenación de SmO2-m.Intercostales (∆SmO2) se asoció con los máximos cambios en ventilación pulmonar (∆VE) en ejercicio (rho=0.80; p=0.05). Conclusiones: Durante un protocolo de esfuerzo, los pacientes con circulación de Fontan presentan mayor trabajo muscular respiratorio que locomotor. Los cambios en la ventilación pulmonar se asocian a mayor extracción de oxígeno en la musculatura respiratoria, reforzando la necesidad de incorporar el entrenamiento respiratorio en la rehabilitación cardiovascular.

Abstract: Background: During a maximum incremental exercise patients with Fontan circulation (PFC) show cardiac limitation reducing aerobic exercise capacity (VO2-peak). Cardiovascular rehabilitation (CR) reverses this deconditioning by increasing cardiac output and arteriovenous oxygen difference, aspects that can be evaluated by invasive methods and analyzing the exhaled gases. Non-invasive assessment of muscle oxygen saturation (SmO2) is a novel method for recording local oxygen levels. By this technology, it is possible to evaluate the muscle limitation to exercise. In PFC, that limitation could be attributed to higher contractions of respiratory (ventilatory changes) and/ or locomotor muscles (peripheral load). Objective: To evaluate in PFC the changes at SmO2 of respiratory and locomotor muscles during a maximum and incremental exercise protocol (cardiopulmonary test, VO2-peak). Methods: Six PFC (5 men; 13.8±2.9 years; 158±9 cm; 49.8±13.3 kg) were assessed during the VO2peak test (23.0±4.5mL·kg-1·min-1) by cyclo-ergospirometry synchronously with SmO2 at respiratory (SmO2-m.Intercostales) and locomotor (SmO2-m. Vastus-Laterallis) muscles by Near-Infrared Spectroscopy (NIRS). Results: SmO2-m.Intercostales decreased from 60% of VO2-peak (p<0.05), while SmO2-m.Vastus-Laterallis did not change. Minute ventilation (VE) increased progressively, showing changes to rest at 60% of VO2-peak (p<0.05). The higher deoxygenation of SmO2-m.Intercostales (∆SmO2) correlated to maximum changes of lung ventilation (∆VE) (rho=0.80; p=0.05). Conclusions: During an incremental and maximum exercise protocol, patients with Fontan circulation have more work at respiratory than locomotor muscles. Changes in VE are direct associated with greater extraction of oxygen at respiratory muscles, reinforcing the incorporation of respiratory muscle training in cardiovascular rehabilitation.

Relationship between respiratory muscle strength and grip strength in institutionalized and community-dwelling older adults / Relação entre força muscular respiratória e de preensão palmar em idosos institucionalizados e da comunidade

OBJECTIVE: To evaluate the relationship between respiratory muscle strength and grip strength in institutionalized and communitydwelling older adults. METHODS: This convenience sampled cross-sectional study had 64 voluntary participants with a good general health status and without limiting chronic diseases: 33 were institutionalized and 31 lived in the community. Maximal inspiratory pressure, maximal expiratory pressure, peak expiratory flow, grip strength, anthropometric data, and physical activity level were assessed. The data were subjected to descriptive analysis, Pearson's correlation test, and linear regression analysis. RESULTS: In the institutionalized group, there was no between respiratory variables and grip strength, but maximal expiratory pressure was the respiratory predictor most strongly associated with grip strength (p = 0.04). In the community-dwelling group, there was a correlation between maximal inspiratory pressure and grip strength (r = 0.54), maximal expiratory pressure and grip strength (r = 0.62), and peak expiratory flow and grip strength (r = 0.64); peak expiratory flow and maximal expiratory pressure were the respiratory predictors most strongly associated with grip strength (p < 0.05). In a joint group analysis, there was an association between maximal inspiratory pressure and grip strength (r = 0.40), maximal expiratory pressure and grip strength (r = 0.57), and peak expiratory flow and grip strength (r = 0.57); peak expiratory flow and maximal expiratory pressure were the respiratory predictors most strongly associated with grip strength (p < 0.05). CONCLUSIONS: Peak expiratory flow and maximal expiratory pressure seem to be good predictors of grip strength in community-dwelling older adults, but this relationship does not seem to be maintained in institutionalized patients, possibly because of a greater loss of respiratory function.

OBJETIVO: Avaliar a relação entre força muscular respiratória e força de preensão palmar em idosos institucionalizados e da comunidade. METODOLOGIA: Caracteriza-se por um estudo transversal com 64 voluntários, sendo 33 institucionalizados e 31 da comunidade. Avaliou-se a pressão inspiratória máxima, pressão expiratória máxima, pico de fluxo expiratório, força de preensão palmar, dados antropométricos e nível de atividade física.Os dados foram submetidos a uma análise descritiva, teste de correlação de Pearson e análise de regressão linear. RESULTADOS: No grupo de institucionalizados, não houve correlação entre as variáveis respiratórias e as de força de preensão palmar, porém o preditor respiratório mais fortemente associado à força de preensão palmar foi a pressão expiratória máxima (p = 0,04). No grupo da comunidade, verificou-se correlação entre pressão inspiratória máxima e força de preensão palmar (r = 0,54), pressão expiratória máxima e força de preensão palmar (r = 0,62), pico de fluxo expiratório e força de preensão palmar (r = 0,64), e o preditor respiratório mais fortemente associado à força de preensão palmar foi pico de fluxo expiratório e pressão expiratória máxima (p < 0,05). Na análise conjunta dos grupos, verificou-se associação entre pressão inspiratória máxima e força de preensão palmar (r = 0,40), pressão expiratória máxima e força de preensão palmar (r = 0,57), pico de fluxo expiratório e força de preensão palmar (r = 0,57), e o preditor respiratório mais fortemente associado à força de preensão palmar foi pico de fluxo expiratório e pressão expiratória máxima (p < 0,05). CONCLUSÕES: Em idosos da comunidade, o pico de fluxo expiratório e a pressão expiratória máxima parecem ser bons preditores da força de preensão palmar, enquanto, em institucionalizados, essa relação parece não se manter possivelmente por conta de maior acentuação de perda da função respiratória.

Fisiología respiratoria: fisiología de los músculos de la respiración / Physiology of the respiratory muscles

La respiración es un proceso continuo donde los músculos respiratorios tienen un rol central e imprescindible para la vida. Su óptimo funcionamiento involucra diversas estructuras que deben funcionar de forma armónica y coordinada, para que el gasto energético asociado a sus demandas permita aumentos considerables de carga sin afectar mayormente la función esencial de intercambio gaseoso. Comprender la fisiología muscular, desde la base anatómica hasta su comportamiento en el ejercicio y la enfermedad, es fundamental para detectar con anticipación las diversas disfunciones que se producen cuando este equilibrio se descompensa. El objetivo de esta revisión es entregar las bases fisiológicas del comportamiento de la musculatura respiratoria que permitan comprender y aplicar las mejores estrategias de evaluación y tratamiento, cuando la función normal se ve alterada, ya sea por enfermedad, desuso o altas cargas asociadas al ejercicio físico.

Breathing is a continuous process where the respiratory muscles have a central and essential role for life. Its optimal operation involves various structures that must work in a harmonious and coordinated way, so that the energy expenditure associated with their demands allows considerable increases in load without significantly affecting the essential function of gas exchange. Understanding muscle physiology, from the anatomical basis to its behavior in exercise and disease, is essential to anticipate the various dysfunctions that can occur when this balance is decompensated. The objective of this review is to provide physiological bases for the behavior of the respiratory muscles that allow understanding and applying the best evaluation and treatment strategies, when its correct functioning is altered, either due to illness, disuse or high loads associated with physical exercise.

Static and dynamic evaluation of respiratory muscle strength in asthmatic children and adolescents / Avaliação estática e dinâmica da força muscular respiratória de crianças e adolescentes asmáticos

Abstract Objectives: to evaluate static and dynamic respiratory muscle strength in children and adolescents with asthma. Methods: cross-sectional study, involving 80 children and adolescents, 40 with asthma and 40 healthy controls. Biological and clinical characteristics were analyzed. The analysis of the dynamic inspiratory muscle strength was obtained using the KH5 device of the POWERbreathe® line, while the static evaluation was performed using an analog manova-cuometer. Results: the mean obtained from the S-Index was higher in the control group compared to asthmatics (p = 0.026). There was no statistical difference between MIP values for asthmatics and predicted values (p = 0.056). The MEP results showed a significant difference between the mean of the cases and the predicted values (p = 0.000). There was a positive correlation between height and S-Index (p = 0.002 and r = 0.438). Conclusion: the present study demonstrated that the static inspiratory muscle strength (PImáx) of children and adolescents with asthma in comparison with the values predicted in the literature does not differ, however, when submitted to dynamic assessment (S-Index), it presents higher values in healthy controls. In addition, the S-Index showed a positive correlation with the child's height.

Resumo Objetivos: avaliar a força muscular respiratória estática e dinâmica em crianças e adolescentes com asma. Métodos: estudo transversal, envolvendo 80 crianças e adolescentes, sendo 40 com asma e 40 controles saudáveis. Analisadas características biológicas e clínicas.A análise da força muscular inspiratória dinâmica foi obtida através do dispositivo KH5 da linha POWERbreathe®, enquanto a avaliação estática, foirealizadapor meio de um manova-cuômetro analógico. Resultados: a média obtida do S-Index foi maior no grupo controle comparado aos asmáticos (p= 0.026). Não houve diferença estatísticaentre os valores de PImáx dos asmáticos e os valores preditos (p = 0.056). Os resultados da PEmáx demonstraram uma diferença significante entre a média dos casos com os valores preditos (p = 0.000). Houve correlação positiva entre a altura e S-Index (p = 0,002 e r = 0,438). Conclusão: o presente estudo demonstrou que a força muscular inspiratória estática (PImáx) de crianças e adolescentes asmáticos em comparação com os valores preditos na literatura não difere, porém, quando submetidos à avaliação dinâmica (S-Index), esta apresenta valores superiores em controles saudáveis. Além disso, o S-Index demonstrou uma correlação positiva com a altura da criança.

Quanto tempo de oclusão é necessário para avaliar a pressão inspiratória máxima pelo método da válvula expiratória unidirecional em sujeitos sem via aérea artificial? / ¿Cuánto tiempo de oclusión es necesario para evaluar la presión inspiratoria máxima por el método de la válvula espiratoria unidireccional en sujetos sin vía aérea artificial? / How much occlusion time is necessary to assess maximal inspiratory pressure by the unidirectional expiratory valve method in subjects without artificial airway?

RESUMO O objetivo desse estudo foi determinar o tempo de oclusão necessário para avaliar a pressão inspiratória máxima (PIMáx) obtida pelo método da válvula expiratória unidirecional em sujeitos sem via aérea artificial. Foram avaliados 31 sujeitos, com idade entre 18 e 60 anos. A PIMáx foi avaliada pelo método convencional (PIMáxconv) e pelo método da válvula expiratória unidirecional (PIMáxuni), sendo a ordem de avaliação definida por meio de sorteio. Para a medida da PIMáxuni, um manovacuômetro digital foi acoplado a uma válvula expiratória unidirecional e máscara orofacial por 20 segundos de oclusão. Nesse período, todos os sujeitos foram encorajados a realizar esforços inspiratórios máximos. Para definir a ótima duração da manobra, o tempo de esforço foi dividido a cada intervalo de 5 segundos (0-5s, 0-10s, 0-15s, 0-20s). Os intervalos de tempo para obtenção da PIMáxuni foram comparados por meio do teste de ANOVA One-way. Para comparação das médias dos valores de PIMáxconv e PIMáxuni, foi utilizado o teste t de Student. O nível de significância foi de 5%. A média dos valores da PIMáxconv foi de -102,5±23,9 cmH2O, enquanto que a PIMáxuni foi de -117,3±24,8 cmH2O (p<0,001). O valor absoluto máximo da PIMáxuni foi alcançado dentro do intervalo de 0-20 segundos, que foi significativamente superior ao valor absoluto máximo obtido nos primeiros 5 segundos (p=0,036). O tempo de oclusão necessário para avaliar a PIMáx pelo método da válvula expiratória unidirecional em sujeitos colaborativos sem via aérea artificial deve ser de pelo menos 20 segundos.

RESUMEN Este estudio busca determinar cuánto tiempo de oclusión es necesario para obtener la presión inspiratoria máxima (PIMáx) por medio del método de la válvula espiratoria unidireccional en individuos sin vía aérea artificial. Se evaluaron 31 sujetos de entre 18 y 60 años de edad. La PIMáx se evaluó mediante el método estándar (PIMáxest) y el método de válvula espiratoria unidireccional (PIMáxuni), siendo que el orden de evaluación se estableció por medio de un sorteo. Para el PIMáxuni, un manovacuómetro digital se ha conectado a una válvula espiratoria unidireccional y una máscara orofacial durante 20 segundos de oclusión. Durante este período, se alentó a los individuos a hacer esfuerzos respiratorios máximos. Para definir la óptima duración de la maniobra, el tiempo de esfuerzo se dividió en intervalos de cinco segundos (0-5s, 0-10s, 0-15s, 0-20s). Los intervalos del tiempo para el PIMáxuni se compararon mediante la prueba ANOVA one-way. Las medias de los valores de PIMáxest y de PIMáxuni se compararon mediante la prueba pareada t de Student. El nivel de significancia se estableció en el 5%. La media de los valores de PIMáxest (-102,5±23,9 cmH2O) presentó una diferencia estadísticamente significativa en comparación con la media de los valores de PIMáxuni (-117,3±24,8 cmH2O, p<0,001). El valor absoluto máximo obtenido de PIMáxuni estaba dentro del intervalo de 0-20 segundos, que fue significativamente superior del valor absoluto máximo durante los primeros 5 segundos (p=0,036). El tiempo de oclusión necesario para registrar la PIMáx por el método de válvula espiratoria unidireccional en individuos colaborativos sin vía aérea artificial debe ser de al menos 20 segundos.

ABSTRACT The aim of this study was to determine how much occlusion time is necessary to obtain maximal inspiratory pressure (MIP) by the unidirectional expiratory valve method in subjects without artificial airway. Thirty-one subjects aged 18-60 years were evaluated. MIP was evaluated by the standard method (MIPstan) and by the unidirectional expiratory valve method MIPuni, with the order of evaluation determined randomly by lot. For MIPuni measurement, a digital vacuum manometer was attached to a unidirectional expiratory valve and an orofacial mask for 20 seconds of occlusion. During this period, all subjects were encouraged to make maximal respiratory efforts. To define the optimum duration of the maneuver, the 20 seconds of effort were partitioned at every five-second interval (0-5s, 0-10s, 0-15s, 0-20s). The time intervals for obtaining MIPuni were compared with the one-way ANOVA test. The mean values of the standard method and the unidirectional expiratory valve method were compared using the paired Student's t-test. The significance level was established at 5%. The mean values for the MIPstan (-102.5±23.9 cmH2O) presented a statistically significant difference as compared to the mean values for MIPuni (-117.3±24.8 cmH2O; p<0.001). Maximal peak values for MIPuni were achieved within the 20-second time window, which differed significantly from the peak values obtained during the first five seconds (p=0.036). The occlusion time necessary to record MIP by the unidirectional expiratory valve method in collaborative subjects without artificial airway should be of at least 20 seconds.

Desempenho muscular respiratório após 12 sessões de treinamento utilizando o aparelho Reformer do método Pilates / Rendimiento muscular respiratorio después de 12 sesiones de entrenamiento utilizando el aparato Reformer del método Pilates / Respiratory muscle performance after 12 sessions of training using the apparatus Reformer of Pilates method

RESUMO Analisar o desempenho muscular respiratório em praticantes de exercícios utilizando o aparelho Reformer do Método Pilates após um treinamento de 12 sessões. O estudo foi realizado com 24 voluntárias, adultas jovens, saudáveis, não tabagistas e não praticantes de exercício físico regular, divididas em Grupo Controle (GC) e Grupo Treinado (GT). Os dois grupos foram submetidos às avaliações inicial e final para análise do desempenho dos músculos respiratórios por meio da manovacuometria e da eletromiografia do músculo reto abdominal. Utilizou-se o teste de Shapiro-Wilk para verificar a normalidade dos dados. A análise de variância two-way foi empregada para as comparações entre os grupos (GT e GC) e os momentos (inicial e final). Para comparações múltiplas, utilizou-se o teste post-hoc de Scheffé. Os GC e GT foram pareados para idade e IMC e, para verificação de diferenças entre os grupos, utilizou-se o teste t pareado. Considerou-se p<0,05 para significância. Houve diferença significante (p=0,039) entre os valores iniciais (116,6 ± 12,8) e finais (120 ± 12,8) de PImáx no GT, assim como entre os valores iniciais (75,3 ± 12,4) e finais (89,3 ± 13,7) de PEmáx nesse mesmo grupo (p=0,0005). Para a eletromiografia houve diferença significante (p=0,03) entre o momento inicial (42,1 ± 15,8) e final (76,7 ± 37,1) do GT para o músculo reto abdominal esquerdo. Conclui-se que as doze sessões de Pilates utilizando o aparelho Reformer melhoraram o desempenho muscular respiratório, aumentando a força da musculatura inspiratória e expiratória.

RESUMEN Evaluar el rendimiento de los músculos respiratorios en practicantes de ejercicios utilizando el método Reformer de Pilates después de un entrenamiento de 12 sesiones. Este estudio se realizó con 24 voluntarios, adultos jóvenes, sanos, no fumadores y no deportistas regulares, siendo divididos en grupo control (GC) y grupo entrenado (GE). El GE participó en un programa de entrenamiento ejecutando 6 ejercicios en el aparato Reformer. Ambos grupos se sometieron a evaluaciones iniciales y finales para analizar el rendimiento de los músculos respiratorios mediante la manovacuometría y la electromiografía del músculo recto abdominal. La prueba de Shapiro-Wilk se utilizó para verificar la normalidad de los datos. Se utilizó el análisis de varianza two-way para las comparaciones entre los grupos (GE y GC) y los momentos (inicial y final). Para comparaciones múltiples, se utilizó la prueba post-hoc de Scheffé. El GC y el GE se emparejaron por edad e IMC mediante la prueba t pareada. Se consideró el valor de significación p<0,05. Se observó una diferencia significativa (p=0,039) entre los valores iniciales (116,6 ± 12,8) y finales (120 ± 12,8) de PImax en el grupo entrenado, así como entre los valores de iniciales (75,3 ± 12,4) y finales (89,3 ± 13,7) de PEmax en el mismo grupo (p=0,0005). En la electromiografía, se observó una diferencia significativa (p=0,03) entre los momentos inicial (42,1 ± 15,8) y final (76,7 ± 37,1) del GE para el músculo recto abdominal izquierdo. Se concluye que las 12 sesiones de Pilates utilizando el aparato Reformer mejoran el rendimiento de los músculos respiratorios, aumentando la fuerza muscular inspiratoria y espiratoria.

ABSTRACT To analyze respiratory muscle performance in exercise practitioners using the Reformer of Pilates method after a 12-session training. This study was carried out with 24 volunteers, healthy young adults, non-smokers and non-regular exercisers, divided into control group (CG) and trained group (TG). The TG participated in a training program executing 6 exercises in the Reformer apparatus. Both groups were submitted to the initial and final evaluations to analyze the performance of the respiratory muscles through the manovacuometry and electromyography of the rectus abdominis muscle. The Shapiro-Wilk test was used to verify the data normality. Two-way analysis of variance was used for the comparisons between the groups (TG and CG) and moments (Initial and Final). For multiple comparisons, the Scheffé post hoc test was used. The groups Control and Trained were paired by age and BMI by paired t test. P <0.05 was considered for significance. A significant difference (p=0039) was observed between the initial (116.6 ± 12.8) and final (120 ± 12.8) values of MIP in the trained group, as well as between baseline values (75.3 ± 12.4) and final (89.3 ± 13.7) of MEP in the same group (p=0.0005). For electromyography, a significant difference (p=0.03) was observed between the initial (42.1 ± 15.8) and final (76.7 ± 37.1) moments of the TG for the left rectus abdominis muscle. The conclusion is that the 12 Pilates sessions using the Reformer apparatus improve respiratory muscle performance, increasing the inspiratory and expiratory muscle strength.

Effects of high-intensity inspiratory muscle training associated with aerobic exercise in patients undergoing cabg: randomized clinical trial

Abstract Objective: Evaluate the interaction between high-intensity inspiratory muscle training (IMT) and aerobic exercise on physical capacity, respiratory muscle strength, peripheral muscle strength, and quality of life of patients who underwent coronary artery bypass grafting (CABG). Methods: Twenty-four patients underwent CABG were randomized into two groups. During 36 sessions, one group received IMT associated with aerobic exercise and the other group received only aerobic exercise. Primary outcome was the distance in the six-minute walk distance (6MWD) test. Secondary outcomes included respiratory muscle strength, peripheral muscle strength, and quality of life. Measures were taken at the baseline, at the 12th session, the 24th session, and 36th session. Results: Baseline characteristics were similar between the groups. There was no statistically significant difference between the two groups in any outcome [6MWD - P=0.935; peak oxygen consumption (PeakVO2) - P=0.853; maximal inspiratory pressure (MIP) - P=0.243; maximal expiratory pressure (MEP) - P=0.268; sitting-rising test (SRT) - P=0.212], but there was interaction in MIP (P=0.000) and all outcomes improved in the two groups (6MWD - P=0.000; PeakVO2 - P=0.000; MIP - P=0.000; MEP - P=0.000; SRT - P=0.000). Conclusion: There was an improvement of all outcomes in both groups, but IMT was not able to provide additional benefits. The use of this combination should be used with caution to not generate higher costs in the rehabilitation process of these patients.

Effect of pilates method on inspiratory and expiratory muscle strength in the elderly / Efeito do método pilates na força dos músculos inspiratórios e expiratórios em idosos

Abstract With aging, the respiratory muscle strength decreases and the Pilates method is a technique that uses respiration as one of its principles. The present study has the aim of analyzing the influence of the Pilates method on respiratory muscle strength in older women. For the evaluation of respiratory muscle strength (inspiratory and expiratory), manovacuometer was used. Thirty-oneolder women were divided into two groups: 14 participated in the Pilates group and 17 in the control group. Participantsof the Pilates group performed 16 sessions of Pilates method with an hour of training, twice week for eight weeks. The control group participated in four educational lectures for eight weeks. For statistical analysis, Shapiro-Wilk, ANOVA for repeated measures (p <0.05) and Cohen's D index were performed. The results showed significant difference and the mean effect for the Cohen's D index expiratory muscle strength of the Pilates group when comparing before (69.71 ± 25.48) and after (85.23 ± 22.21) training (p<0.05) with an increase of 23%. The results of inspiratory muscle strength were not significant but presented an average effect for the Cohen's D index for the Pilates group before (69.71 ± 35.46) and after (88.00 ± 34.87) training, with an increase of 27%. The control group did not present significant differences for the variables evaluated. It could be concluded that the Pilates method is effective in improving expiratory muscle strength and provides positive effects on the increase in inspiratory muscle strength.

Resumo Com o envelhecimento, a força muscular respiratória diminui e o método Pilates é uma técnica que utiliza da respiração como um de seus princípios. Com isso, o presente estudo tem como objetivo analisar a influência do método Pilates na força muscular respiratória em idosas. Para a avaliação da força dos músculos respiratórios (inspiratórios e expiratórios) foi utilizado o manovacuomêtro. Participaram da pesquisa 31 idosas que foram divididas em dois grupos, 14 idosas participaram do grupo Pilates e 17 do grupo controle. As idosas participantes do grupo Pilates realizaram 16 sessões com uma hora de treinamento, duas vezes na semana, durante oito semanas. Quanto ao grupo controle, as idosas participaram de quatro palestras educativas durante oito semanas. Para a análise estatística foi realizado o teste de Shapiro-Wilk, ANOVA para medidas repetidas e o D de Cohen. Os resultados mostraram diferença significativa e efeito médio para o índice de D de Cohen da força dos músculos expiratórios do grupo Pilates, ao comparar antes (69,71 ± 25,48) e após (85,23 ± 22,21) o treinamento (p<0,05), com aumento de 23%. Os resultados da força muscular inspiratória não apresentaram diferença significativa, mas apresentou efeito médio para o índice de D de Cohen para o grupo Pilates comparando antes (69,71 ± 35,46) e após (88,00 ± 34,87) o treinamento, com um aumento de 27%. O grupo controle não apresentou diferença significativa para as variáveis avaliadas. Pode-se concluir que o método Pilates é eficaz na melhora da força muscular expiratória e apresenta efeito positivo sobre o aumento da força muscular inspiratória.

Airway positive pressure vs. exercises with inspiratory loading focused on pulmonary and respiratory muscular functions in the postoperative period of bariatric surgery / Pressão positiva nas vias aéreas versus exercícios com carga inspiratória na função pulmonar e na função muscular respiratória no pós-operatório de cirurgia bariátrica

ABSTRACT Background: Bariatric surgery can trigger postoperative pulmonary complications due to factors inherent to the procedure, mainly due to diaphragmatic dysfunction. Aim: To evaluate and compare the effects of two levels of positive pressure and exercises with inspiratory load on lung function, inspiratory muscle strength and respiratory muscle resistance, and the prevalence of atelectasis after gastroplasty. Methods: Clinical, randomized and blind trial, with subjects submitted to bariatric surgery, allocated to two groups: positive pressure group, who received positive pressure at two levels during one hour and conventional respiratory physiotherapy and inspiratory load group, who performed exercises with load linear inspiratory pressure, six sets of 15 repetitions, in addition to conventional respiratory physiotherapy, both of which were applied twice in the immediate postoperative period and three times a day on the first postoperative day. Spirometry was performed for pulmonary function analysis, nasal inspiratory pressure for inspiratory muscle strength and incremental test of respiratory muscle resistance for sustained maximal inspiratory pressure, both preoperatively and on hospital discharge on the second postoperative day. Results: There was no significant difference (p> 0.05) in the expiratory reserve volume and in the tidal volume in the pre and postoperative periods when compared intra and intergroup. There was no significant difference (p>0.05) in the nasal inspiratory pressure and the maximal inspiratory pressure maintained in the inspiratory load group in the intragroup evaluation, but with a significant difference (p<0.05) compared to the positive pressure group. The prevalence of atelectasis was 5% in both groups with no significant difference (p>0.05) between them. Conclusion: Both groups, associated with conventional respiratory physiotherapy, preserved expiratory reserve volume and tidal volume and had a low atelectasis rate. The inspiratory loading group still maintained inspiratory muscle strength and resistance of respiratory muscles.

RESUMO Racional : A cirurgia bariátrica pode desencadear complicações pulmonares no pós-operatório devido a fatores inerentes ao procedimento, sobretudo pela disfunção diafragmática. Objetivo : Avaliar e comparar os efeitos da aplicação de dois níveis de pressão positiva e dos exercícios com carga inspiratória na função pulmonar, força muscular inspiratória e resistência muscular respiratória e na prevalência de atelectasia após gastroplastia. Métodos : Ensaio clínico, randomizado e cego, com sujeitos submetidos à cirurgia bariátrica, alocados em dois grupos: grupo pressão positiva, que recebeu pressão positiva em dois níveis, durante uma hora e fisioterapia respiratória convencional e grupo carga inspiratória, que realizou exercícios com carga linear pressórica inspiratória, seis séries de 15 repetições, além da fisioterapia respiratória convencional, sendo ambos aplicados duas vezes no pós-operatório imediato e três vezes ao dia no primeiro dia de pós-operatório. Foram realizados espirometria para análise da função pulmonar, pressão inspiratória nasal para força muscular inspiratória e teste incremental de resistência muscular respiratória para pressão inspiratória máxima sustentada, no pré-operatório e no dia da alta hospitalar, no segundo dia de pós-operatório. Resultados : Não houve diferença significativa (p>0,05) no volume de reserva expiratório e no volume corrente no pré e no pós-operatório quando comparados intra e intergrupo. Não houve diferença significativa (p>0,05) na pressão inspiratória nasal e na pressão inspiratória máxima sustentada no grupo carga inspiratória na avaliação intragrupo, mas com diferença significativa (p<0,05) comparada ao grupo pressão positiva. A prevalência de atelectasias foi de 5% em ambos os grupos sem diferença significativa (p>0,05) entre eles. Conclusão : Ambos os grupos, associados à fisioterapia respiratória convencional, preservaram o volume de reserva expiratório e o volume corrente e apresentaram baixo índice de atelectasias. O grupo carga inspiratória ainda manteve a força muscular inspiratória e a resistência dos músculos respiratórios.

The influence of inspiratory muscle training combined with the Pilates method on lung function in elderly women: A randomized controlled trial

OBJECTIVE: Aging is progressive, and its effects on the respiratory system include changes in the composition of the connective tissues of the lung that influence thoracic and lung compliance. The Powerbreathe® K5 is a device used for inspiratory muscle training with resistance adapted to the level of the inspiratory muscles to be trained. The Pilates method promotes muscle rebalancing exercises that emphasize the powerhouse. The aim of this study was to evaluate the influence of inspiratory muscle training combined with the Pilates method on lung function in elderly women. METHODS: The participants were aged sixty years or older, were active women with no recent fractures, and were not gait device users. They were randomly divided into a Pilates with inspiratory training group (n=11), a Pilates group (n=11) and a control group (n=9). Spirometry, manovacuometry, a six-minute walk test, an abdominal curl-up test, and pulmonary variables were assessed before and after twenty intervention sessions. RESULTS: The intervention led to an increase in maximal inspiratory muscle strength and pressure and power pulmonary variables (p<0.0001), maximal expiratory muscle strength (p<0.0014), six-minute walk test performance (p<0.01), and abdominal curl-up test performance (p<0.00001). The control group showed no differences in the analyzed variables (p>0.05). CONCLUSION: The results of this study suggest inspiratory muscle training associated with the Pilates method provides an improvement in the lung function and physical conditioning of elderly patients.

Comparative study of respiratory muscle strength in women undergoing conventional and single-port laparoscopic cholecystectomy

Abstract Purpose: To evaluate respiratory muscle strength (PImax and PEmax) before and 24 and 48 h after conventional and single-port laparoscopic cholecystectomy. Methods: Forty women with symptomatic cholelithiasis (18 to 70 years) participated in the study. The patients were divided into two groups: 21 patients undergoing conventional laparoscopic cholecystectomy and 19 patients undergoing single-port laparoscopic cholecystectomy. Differences were considered to be significant when p<0.05. Results: The results showed a greater decline in PImax after 24 h in the group submitted to conventional laparoscopic cholecystectomy, with a significant difference between groups (p=0.0308). Conclusion: Recovery of the parameters studied was more satisfactory and respiratory muscle strength was less compromised in the group submitted to single-port laparoscopic cholecystectomy.

Estudo comparativo do ângulo da cifose torácica e da força dos músculos respiratórios de mulheres idosas / A comparative study of thoracic kyphosis angles and respiratory muscle strength of elderly women

Objetivo: O aumento da cifose torácica e a diminuição da força dos músculos respiratórios estão entre as alterações fisiológicas mais observadas em idosos. O objetivo deste estudo foi comparar medidas do ângulo da cifose torácica e da força dos músculos respiratórios entre idosas praticantes e não praticantes de atividade física. Método: Foram avaliadas 54 idosas entre 60 e 80 anos, distribuídas em dois grupos: Grupo 1, com 27 idosas praticantes de atividade física (71,3 ± 5,1 anos); e Grupo 2, com 27 idosas não praticantes de atividade física (70,2 ± 4,8 anos). A força dos músculos respiratórios foi avaliada por meio da pressão inspiratória máxima (Pimáx) e da pressão expiratória máxima (Pemáx); e o grau de cifose torácica, por meio do método Flexicurva. Para a análise dos dados, foram utilizados correlação de Pearson e teste t de Student, com nível de significância p < 0,05. Resultados: As idosas do Grupo 1 exibiram valores maiores na Pimáx e na Pemáx quando comparadas com as idosas do Grupo 2. Esse resultado poderia ser explicado pelos efeitos do tempo da prática de atividade física regular e da especificidade do esporte. Conclusão: Os resultados sugerem que a prática regular de atividade física contribui para a manutenção da força dos músculos respiratórios e para retardar o aumento do ângulo da cifose torácica em idosas fisicamente ativas.

Objective: The increase in thoracic kyphosis and the decrease in respiratory muscle strength are among the most frequently observed physiological changes in the elderly. The aim of this study was to compare thoracic kyphosis angle and respiratory muscle strength measurements among women who do physical activity with those who do not. Method: We evaluated 54 elderly women aged between 60 and 80 years old, and distributed them into two groups: Group 1, with 27 physically active elderly women (71.3 ± 5.1 years old); and Group 2, with 27 elderly women who do not do physical activity (70.2 ± 4.8 years old). Respiratory muscle strength was assessed by maximal inspiratory pressure (MIP) and maximal expiratory pressure (MEP), and the angle degree of the thoracic kyphosis was measured using the Flexicurva method. For data analysis, we used Pearson's correlation test and Student's t-test, with a significance level set at p < 0.05. Results: Group 1participants showed higher values of MIP and MEP when compared to those in Group 2. A possible reason for this result could be the effects of regular physical activity and, specifically, the sport practiced. Conclusion: Results suggest that regular participation in physical activity contributes to the maintenance of respiratory muscle strength and delays the increase of the thoracic kyphosis angle in physically active elderly women.

Potencial aplicação clínica da eletromiografia de superfície como indicador de recuperação neuromuscular durante testes de desmame após envenenamento por organofosforados / Potential clinical application of surface electromyography as indicator of neuromuscular recovery during weaning tests after organophosphate poisoning

RESUMO Este estudo teve como objetivo explorar a utilidade da avaliação da atividade muscular respiratória em pacientes em uso de ventilação mecânica após envenenamento agudo por organofosforados, para fornecer informações complementares para determinação do melhor momento para suspensão do suporte ventilatório. Foi registrada eletromiografia de superfície em músculos respiratórios (diafragma, intercostais externos e esternocleidomastóideos) em um homem jovem afetado por autoenvenenamento com quantidade desconhecida de paration, para determinar o nível de atividade muscular no decurso de diversas tentativas de desmame da ventilação mecânica. A distribuição de energia de cada frequência de sinal de eletromiografia de superfície; a sincronização entre máquina, paciente e músculos; a atividade da enzima acetilcolinesterase; o trabalho respiratório e os índices de respiração rápida e superficial foram calculados em cada uma das tentativas de desmame. O trabalho respiratório e o índice de respiração rápida e superficial não se correlacionaram com a falha ou o sucesso da tentativa de desmame. O diafragma aumentou gradualmente seu envolvimento com a ventilação, tendo alcançado resposta máxima, que se correlacionou com o sucesso do desmame e a atividade máxima da enzima acetilcolinesterase. Por outro lado, a atividade de músculos respiratórios acessórios mostrou tendência oposta.

ABSTRACT This study aimed to explore the usefulness of measuring respiratory muscle activity in mechanically ventilated patients suffering from acute organophosphate poisoning, with a view towards providing complementary information to determine the best time to suspend ventilatory support. Surface electromyography in respiratory muscles (diaphragm, external intercostal and sternocleidomastoid muscles) was recorded in a young man affected by self-poisoning with an unknown amount of parathion to determine the muscle activity level during several weaning attempts from mechanical ventilation. The energy distribution of each surface electromyography signal frequency, the synchronization between machine and patient and between muscles, acetylcholinesterase enzyme activity, and work of breathing and rapid shallow breathing indices were calculated in each weaning attempt. The work of breathing and rapid shallow breathing indices were not correlated with the failure/success of the weaning attempt. The diaphragm gradually increased its engagement with ventilation, achieving a maximal response that correlated with successful weaning and maximal acetylcholinesterase enzyme activity; in contrast, the activity of accessory respiratory muscles showed an opposite trend.

Análisis de presión inspiratoria máxima según tres protocolos en estudiantes voluntarios asintomáticos de la Universidad Católica del Maule, Chile / Analysis of maximal inspiratory pressure according to three protocols in asymptomatic volunteer students at the Catholic University of Maule, Chile

Maximum inspiratory pressure (MIP) has been used as an indicator of inspiratory muscle strength. Nevertheless their values show a high variability (~20%). The aim of this study was to determine the MIP, according to three protocols in young subjects. An observational cross-sectional study was carried out on a convenience sample of 60 students, 30 men (19.2 ± 0.81 years-old) and 30 women (19.17 ± 0.91 years-old). MIP was evaluated according to the protocol defined for each group of 20 participants of both genders: Group 1: American Thoracic Society/European Respiratory Society (ATS/ERS); Group 2: Learning; Group 3: Warming. For the analysis we used descriptive and inferential statistics, a p value < 0.05 was considered significant. No differences in MIP were found for the three best averages between groups (p = 0.078). When comparing the total performance of MIP replicates G3 was higher than G1 and G2 (p <0.0001). The coefficient of variation was higher in G2. It is concluded that the warming protocol (G3) could mitigate the effect of learning.

La presión inspiratoria máxima (PIM) ha sido utilizada como indicador de fuerza de la musculatura inspiratoria. No obstante sus valores presentan gran variabilidad (~20%). El objetivo del estudio fue determinar la PIM, según tres protocolos en sujetos jóvenes. Se realizó un estudio observacional de corte transversal en una muestra por conveniencia de 60 estudiantes, 30 hombres (19,2 ± 0,81 años) y 30 mujeres (19,17 ± 0,91 años). Se evaluó la PIM según el protocolo definido para cada grupo compuesto por 20 participantes de ambos géneros: Grupo 1: American Thoracic Society/European Respiratory Society (ATS/ERS); Grupo 2: Aprendizaje; Grupo 3: Calentamiento. Para el análisis se utilizó estadística descriptiva, e inferencial considerándose significativo un valor de p < 0,05. No se encontraron diferencias de PIM de los tres mejores promedios entre grupos (p = 0,078). Al comparar el desempeño total de las repeticiones de PIMG3 fue más alto que G1 y G2 (p < 0,0001). El coeficiente de variación fue más alto en G2. Se concluye que el protocolo calentamiento (G3) podría atenuar el efecto de aprendizaje.

Diaphragmatic mobility: relationship with lung function, respiratory muscle strength, dyspnea, and physical activity in daily life in patients with COPD / Relação da mobilidade diafragmática com função pulmonar, força muscular respiratória, dispneia e atividade física de vida diária em pacientes com DPOC

ABSTRACT Objective: To evaluate diaphragmatic mobility in relation to lung function, respiratory muscle strength, dyspnea, and physical activity in daily life (PADL) in patients with COPD. Methods: We included 25 patients with COPD, classified according to the Global Initiative for Chronic Obstructive Lung Disease criteria, and 25 healthy individuals. For all of the participants, the following were evaluated: anthropometric variables, spirometric parameters, respiratory muscle strength, diaphragmatic mobility (by X-ray), PADL, and the perception of dyspnea. Results: In the COPD group, diaphragmatic mobility was found to correlate with lung function variables, inspiratory muscle strength, and the perception of dyspnea, whereas it did not correlate with expiratory muscle strength or PADL. Conclusions: In patients with COPD, diaphragmatic mobility seems to be associated with airway obstruction and lung hyperinflation, as well as with ventilatory capacity and the perception of dyspnea, although not with PADL.

RESUMO Objetivo: Avaliar a relação da mobilidade diafragmática com a função pulmonar, força muscular respiratória, dispneia e atividade física de vida diária (AFVD) em pacientes com DPOC. Métodos: Foram avaliados 25 pacientes com diagnóstico de DPOC, classificados de acordo com critérios da Global Initiative for Chronic Obstructive Lung Disease, e 25 indivíduos saudáveis. Todos foram submetidos às seguintes avaliações: mensuração antropométrica, espirometria, força muscular respiratória, mobilidade diafragmática (por radiografia), AFVD e percepção de dispneia. Resultados: No grupo DPOC, houve correlações da mobilidade diafragmática com variáveis de função pulmonar, força muscular inspiratória e percepção de dispneia. Não houve correlações da mobilidade diafragmática com força muscular expiratória e AFVD. Conclusões: A mobilidade diafragmática parece estar associada tanto com a obstrução das vias aéreas quanto com a hiperinsuflação pulmonar em pacientes com DPOC, assim como com a capacidade ventilatória e percepção de dispneia, mas não com AFVD.

Efectos de un Programa de Rehabilitación Pulmonar con énfasis en el entrenamiento de la musculatura respiratoria y actividades recreativas en un grupo de pacientes con EPOC / Effects of a program of pulmonary rehabilitation with emphasis on the training of the respiratory muscles and recreational activities in COPD patients

Introducción: La EPOC se caracteriza principalmente por una limitación crónica del flujo aéreo que altera la calidad de vida de los sujetos que la padecen. El objetivo de este estudio es evidenciar los efectos que tiene un programa de rehabilitación pulmonar (RP) diseñado en atención primaria y con escasos recursos en un grupo de pacientes EPOC. Pacientes y Método: Estudio de cohorte prospectivo de 13 pacientes (5 hombres, 8 mujeres) de 74,38 ± 10,12 ( X ¯ ± DS) años de edad, con diagnóstico de EPOC (Estadio GOLD I, II y III) que fueron sometidos durante 3 meses a un programa de RP con énfasis en el entrenamiento de la musculatura respiratoria y periférica, kinesiterapia respiratoria y actividades recreativas como inflar globos. Las variables medidas pre y post entrenamiento fueron: función pulmonar, test de marcha de 6 min (TM6), disnea a través de la escala modificada del Medical Research Council (mMRC), presión inspiratoria máxima (PIM), a volumen residual (VR) y a capacidad residual funcional (CRF), tiempo de resistencia a la fatiga de la musculatura inspiratoria (TRFMI), tiempo de resistencia a la fatiga de la musculatura espiratoria (TRFME), calidad de vida a través del COPD Assessment Test (CAT) y la circunferencia de los globos inflados (CGI) por cada paciente. El análisis estadístico se realizó con el programa SPSS versión 22, utilizando la prueba t de student para muestras relacionadas. Resultados: Hubo cambios significativos (p < 0,05) en: PIM CRF, PIM VR, TRFMI, TRFME, TM6, Disnea, CAT y CGI. Conclusiones: Nuestro programa de RP mejoró ¡a disnea, capacidad de ejercicio, calidad de vida y la fuerza y resistencia de la musculatura respiratoria lo que se reflejó en una mayor CGI por cada paciente post entrenamiento. Por lo tanto, afirmamos que sí es posible diseñar un programa de RP en atención primaria con pocos recursos y obtener excelentes resultados.

Introduction: COPD is characterized by a chronic limitation to airflow that alters the quality of life of the people suffering this illness. The objective of this study is to demonstrate the effects that has a pulmonary rehabilitation program (PRP) designed in primary care using limited resources in a group of COPD patients. Method: Prospective study of 13 patients (5 men, 8 women), age: 74.38 ± 10.12 ( X ¯ ± SD) years-old with COPD, GOLD stage I, II and III, which were submitted for 3 months to a pulmonary rehabilitation program with emphasis on the training of the respiratory muscles and recreational activities like inflating balloons. The variables measured pre and post training were: lung function, six-minute walk test (6MWT), dyspnea using the modified scale from Medical Research Council (mMRC), maximal inspiratory pressure (PIMax) at functional residual capacity (FRC), PIMax at residual volume (RV), time of fatigue resistance of the inspiratory and expiratory muscles (TFRIM and TFREM respectively), quality of life through the COPD assessment Test (CAT) and the circumference of the inflated balloons (CIB) for each patient. Results: Significant changes (p < 0.05) were found in: dyspnea, distance of 6MWT, PIMax at FRC, PIMax at RV, CAT, TFRIM, TFREM and CIB. Conclusions: Our pulmonary rehabilitation program improved the dyspnea, exercise capacity, quality of life and the strength and endurance of the respiratory muscles which was reflected by a greater circumference of the inflated balloons by each patient post-training. Therefore we affirm that it is possible to design a pulmonary rehabilitation program in primary care using limited resources and getting excellent results.

Efecto del entrenamiento de músculos abdominales sobre la fuerza muscular respiratoria y flujos espiratorios forzados en adolescentes sanos sedentarios / Effect of abdominal muscle training on respiratory muscle strength and forced expiratory flows in sedentary, healthy adolescents

Introducción. El entrenamiento muscular respiratorio es el método más utilizado para revertir la debilidad muscular respiratoria; no obstante, el efecto de protocolos basados en maniobras no respiratorias no ha sido suficientemente estudiado en población pediátrica. El objetivo de este estudio fue determinar el efecto del entrenamiento de la musculatura abdominal sobre la fuerza de los músculos respiratorios y los flujos espiratorios forzados en adolescentes sanos. Métodos. Estudio cuasiexperimental. La muestra estuvo integrada por adolescentes sanos divididos en dos grupos: un grupo experimental, quienes realizaron 8 semanas de entrenamiento de la musculatura abdominal activo, y un grupo control equivalente. Se midió la fuerza de los músculos abdominales, la presión inspiratoria máxima, la presión espiratoria máxima (PeMax), el flujo espiratorio máximo y el flujo máximo de tos antes y después del protocolo. Se consideró significativo un valor de p < 0,05. Resultados. Todas las variables estudiadas aumentaron significativamente en el grupo experimental; sin embargo, solo la PeMax se incrementó en el grupo control. Adicionalmente, el grupo experimental presentó una mayor PeMax que el grupo control al final del protocolo, así como también una mayor ganancia en la PeMax y flujo espiratorio máximo. Finalmente, el incremento en la PeMax se asoció con el aumento en el flujo máximo de tos en el grupo experimental, lo que no fue observado en el grupo control. Conclusión. En 8 semanas de entrenamiento de la musculatura abdominal, se logró incrementar la PeMax y el flujo espiratorio máximo en adolescentes sanos (sedentarios). Estos efectos se asociaron a incrementos en el flujo máximo de tos inducidos por la intervención.

Introduction. Respiratory muscle training is the most commonly used method to revert respiratory muscle weakness; however, the effect of protocols based on non-respiratory maneuvers has not been adequately studied in the pediatric population. The objective of this study was to establish the effect of abdominal muscle training on respiratory muscle strength and forced expiratory flows in healthy adolescents. Methods. This was a quasi-experiment. The sample was made up of healthy adolescents divided into two groups: an experimental group who completed eight weeks of active abdominal muscle training, and an equivalent control group. The following indicators were measured: abdominal muscle strength, maximal inspiratory pressure, maximal expiratory pressure (MEP), peak expiratory flow, and peak cough flow, before and after protocol completion. A value of p < 0.05 was considered significant. Results. All studied outcome measures increased significantly in the experimental group but only MEP increased in the control group. In addition, a higher MEP was observed in the experimental group compared to the control group at the end of the protocol, together with a greater increase in MEP and peak expiratory flow. Finally, the increase in MEP was associated with an increase in cough peak flow in the experimental group but not in the control group. Conclusion. After eight weeks of abdominal muscle training, MEP and peak expiratory flow increased in healthy (sedentary) adolescents. Such effects were associated with intervention-induced increases in cough peak flow.