Rehabilitación cardiorrespiratoria en hipertensión pulmonar: experiencia en un centro de referencia / Cardiorespiratory rehabilitation in pulmonary hypertension: experience in a reference center

RESUMEN Introducción: La hipertensión pulmonar (HP) abarca un grupo heterogéneo de enfermedades que genera discapacidad y aumento de la morbimortalidad. La rehabilitación cardiorrespiratoria (RC) es un recurso terapéutico subutilizado en esta condición. Objetivo: Estimar los efectos de un programa de RC en una prueba de caminata de campo y en la calidad de vida de pacientes con diagnóstico de HP de los grupos I y IV. Materiales y Métodos: Los pacientes fueron evaluados antes y después de la intervención mediante la prueba de caminata de 6 minutos (PC6M) y el Saint George's Respiratory Questionnaire (SGRQ). El programa de RC consistió en 8 semanas de ejercicios supervisados con modalidad institucional. Resultados: Se incluyeron 19 pacientes con diagnóstico de HP precapilar por cateterismo cardíaco derecho, 18 mujeres (94,7%) con una media de edad de 45,5 ± 14,3 años. Trece (68,4%) presentaron HP del grupo I, y 6 (31,6%) HP del grupo IV. Se observaron cambios estadísticamente significativos en la PC6M (diferencia de medias -DM- 31 ± 27,3 metros; p <0,001), y en el SGRQ (DM 8,2 ± 10,2; p<0,01). No se reportaron eventos adversos graves durante el programa. Conclusiones: Nuestro estudio sugiere que un programa de RC supervisado en pacientes con HP podría mejorar la distancia caminada y la calidad de vida.

ABSTRACT Background: Pulmonary hypertension (PH) comprises a heterogeneous group of diseases resulting in disability and increased morbidity and mortality. Cardiopulmonary rehabilitation (CR) is a therapeutic resource not widely used in this condition. Objective: The aim of this study was to evaluate the effects of a CR program on a walking test and on the quality of life in patients with group 1 and group 4 PH Methods: Patients were evaluated before and after the intervention with the six-minute walk test (6MWT) and Saint George's Respiratory Questionnaire (SGRQ). The program consisted of 8 weeks of supervised exercises within the institution. Results: Nineteen patients with precapillary PH diagnosed by right heart catheterization were included; 18 were women (94.7%) with a mean age of 45.5±14.3 years. Thirteen (68.4%) patients had group 1 PH and 6 (31.6%) had group 4 PH. There were statistically significant changes in the 6MWT [mean difference (MD) 31±27.3 m; p<0.001], and in the SGRQ (MD 8.2±10.2; p<0.01). No adverse events were reported during the program. Conclusions: Our study suggests that a supervised CR program in patients with PH could improve the distance walked and the quality of life.

Application of 6-minute walk and grip strength tests in nursing evaluation of early arterial stiffness in community-dwelling elderly / 中国实用护理杂志

Objective:To explore the application of 6MWT and handgrip strength test in the nursing evaluation of arterial stiffness in community-dwelling elderly.Methods:From September 2019 to January 2020, 129 community-dwelling elderly people (age 60 years or older) were selected as the research subjects. Arterial stiffness was detected by pulse wave detector, and handgrip strength test and 6MWT were performed. Pearson correlation analysis and multiple linear regression methods were used to analyze the relationship between handgrip strength and 6MWT test indicators and aortic pulse wave velocity (aPWV) and augmentation index75 (AIx75).Results:The community-dwelling older people of aPWV was (10.50 ± 1.36) m/s and was negatively correlated with 6MWT distance and 6WMT work, of which the correlation coefficients were -0.404 and -0.285 respectively ( P<0.05). The community-dwelling older people of AIx75 was (28.51 ± 10.81) % and was negatively correlated with handgrip strength, relative grip strength, 6MWT distance and 6MWT work, of which the range of correlation coefficients were from -0.261 to -0.226 ( P<0.05). After adjusting for age, gender, and blood pressure, 6MWT distance and grip strength were independently related to aPWV and AIx75, respectively. Conclusions:In community-dwelling elderly people, both the grip strength test and 6MWT can be used for nursing evaluation of early arterial stiffness, but the specific evaluation role is different.

Application of six-minute walk test in preoperative evaluation of patients undergoing pulmonary lobectomy / 中国康复理论与实践

@#Objective To analyze the feasibility of six-minute walk test (6MWT) before pulmonary lobectomy and prediction for postoperative outcome. Methods A total of 580 patients who were hospitalized in the department of lung surgery from May, 2017 to May, 2019 were reviewed, and 274 eligible patients were selected, who underwent first surgery and the surgical method was pulmonary lobectomy. They were divided into two groups based on the results of 6MWT before operation. The cut-off value of six-minute walk distance (6MWD) was obtained by receiver operating characteristic curve (ROC) area under curve (AUC). The postoperative outcome and the occurrence of cardiopulmonary complications in the two groups were analyzed. Results Compared to patients with 6MWD > 449 meters, the age was significantly older (P < 0.001), the forced expiratory volume in the first second (FEV1) was poor in patients with 6MWD ≤ 449 meters (P < 0.05), and other factors such as surgical resection site, pathological stage, gender, etc., were not significantly different (P > 0.05). The incidence of postoperative cardiopulmonary complications was significantly higher (OR = 2.672, 95%CI 1.488 to 4.798, P = 0.002), and the postoperative extubation time and hospital stay was longer in patients with 6MWD ≤ 449 meters than in patients with 6MWD > 449 meters (P < 0.05). 6MWD ≤ 449 meters was an independent risk factor for postoperative cardiopulmonary complications (OR = 2.395, 95%CI 1.299 to 4.415, P = 0.005). Conclusion As a simple function test, 6MWT can be routinely used to assess the physiological function of patients undergoing pulmonary lobectomy. Patients with 6MWD ≤ 449 meters may be in higher risks of postoperative cardiopulmonary complications.

Correlação entre capacidade funcional, força muscular respiratória e força de preensão palmar em candidatos a transplante de fígado / Correlation of functional capacity, respiratory muscle strength, and hand grip strength in liver transplant candidates

Introdução: O transplante de fígado (TxF) é o procedimento padrão recomendado para pacientes com doença hepática terminal. Muitos, enquanto aguardam o TxF apresentam como deterioração funcional a diminuição da força muscular respiratória, força de preensão palmar e capacidade funcional. O objetivo deste estudo foi correlacionar a capacidade funcional, força muscular respiratória e força de preensão palmar em candidatos a transplante de fígado. Métodos: Trata-se de um estudo observacional, prospectivo, quantitativo. Participaram do estudo pacientes candidatos ao TxF que estavam em tratamento na unidade de transplante de fígado em um hospital de referência no noroeste paulista. Os pacientes foram avaliados por meio de: teste de caminhada de seis minutos, manovacuometria e dinamometria. Para análise dos dados foi utilizado o teste de correlação linear de Pearson. Valores de p ≤ 0,05 foram considerados significantes. Resultados: Foram avaliados 38 pacientes cirróticos no pré-operatório de TxF. A média de idade dos pacientes foi de 54,34 ± 8,18 anos, com predominância do gênero masculino (68%), a média do MELD e do IMC foram de 20,84 ± 6,26 pontos e 27,75 ± 5,0 kg/m2, respectivamente. Na força muscular respiratória verificou-se que os pacientes apresentaram média de pressão inspiratória máxima (PImáx) 75,89% e pressão expiratória máxima (PEmáx) 76,82% do predito. Nas análises de correlações entre as variáveis do estudo verificou-se correlação diretamente proporcional, significativa (p ≤ 0,0001) e forte entre preensão manual vs força muscular respiratória, moderada entre preensão manual vs capacidade funcional e moderada entre força muscular respiratória vs capacidade funcional. Conclusão: Os pacientes candidatos a TxF apresentaram correlação positiva entre capacidade funcional, força muscular respiratória e força de preensão palmar. Alterações na força muscular respiratória e de preensão palmar se correlacionaram a redução na capacidade funcional nestes pacientes.

Introduction: Liver transplantation (TxF) is the standard procedure recommended for patients with terminal liver disease. Many, while waiting for the TxF present as functional deterioration the decrease in respiratory muscle strength, hand grip strength, and functional capacity. The aim of this study was correlate functional capacity, respiratory muscle strength, and hand grip strength in liver transplant candidates. Methods: This is an observational, prospective, quantitative study. Candidates for TxF who were being treated at the liver transplant unit in a referral hospital in northwest São Paulo participated in the study. The patients were evaluated using: six- minute walk test, manovacuometry, and dynamometry. Pearson's linear correlation test was used for data analysis. Values of p ≤ 0.05 were considered significant. Results: A total of 38 cirrhotic patients were evaluated in the preoperative period of TxF. The mean age of the patients was 54.34 ± 8.18 years, with a predominance of males (68%), the mean MELD and BMI were 20.84 ± 6.26 points and 27.75 ± 5.0 kg/m2, respectively. Regarding respiratory muscle strength, it was found that patients had a mean maximum inspiratory pressure (PImax) 75.89% and maximum expiratory pressure (PEmax) 76.82% of the predicted. In the analysis of correlations between the study variables, there was a directly proportional, significant (p ≤ 0.0001) and strong correlation between hand grip vs respiratory muscle strength, moderate between hand grip vs functional capacity and moderate between respiratory muscle strength vs functional capacity. Conclusion: Candidate patients for TxF showed a positive correlation between functional capacity, respiratory muscle strength, and hand grip strength. Changes in respiratory muscle strength and hand grip was correlated with the reduction in functional capacity in these patients.

Lung function and stress echocardiography in pulmonary arterial hypertension: a cross-sectional study

ABSTRACT BACKGROUND: The mechanism of exercise limitation in idiopathic pulmonary arterial hypertension (IPAH) is not fully understood. The role of hemodynamic alterations is well recognized, but mechanical, ventilatory and gasometric factors may also contribute to reduction of exercise capacity in these individuals. OBJECTIVE: To investigate whether there is an association between ventilatory pattern and stress Doppler echocardiography (SDE) variables in IPAH patients. DESIGN AND SETTING: Single-center prospective study conducted in a Brazilian university hospital. METHODS: We included 14 stable IPAH patients and 14 age and sex-matched controls. Volumetric capnography (VCap), spirometry, six-minute walk test and SDE were performed on both the patients and the control subjects. Arterial blood gases were collected only from the patients. The IPAH patients and control subjects were compared with regard to the abovementioned variables. RESULTS: The mean age of the patients was 38.4 years, and 78.6% were women. The patients showed hypocapnia, and in spirometry 42.9% presented forced vital capacity (FVC) below the lower limit of normality. In VCap, IPAH patients had higher respiratory rates (RR) and lower elimination of CO2 in each breath. There was a significant correlation between reduced FVC and the magnitude of increases in tricuspid regurgitation velocity (TRV). In IPAH patients, VCap showed similar tidal volumes and a higher RR, which at least partially explained the hypocapnia. CONCLUSIONS: The patients with IPAH showed hypocapnia, probably related to their higher respiratory rate with preserved tidal volumes; FVC was reduced and this reduction was positively correlated with cardiac output.

Evaluación de la capacidad funcional en escolares con fisiología de corazón univentricular / Assessment of functional capacity among students with univentricular heart

Se realizó un estudio transversal en escolares con corazón univentricular en estadio pos-bypass total de ventrículo derecho con el objetivo de determinar la capacidad funcional basal mediante el test de marcha en 6 minutos e identificar posibles factores determinantes. Participaron 30 pacientes con una mediana de edad de 12 años. Dieciocho pacientes fueron de sexo masculino. La mediana de distancia recorrida fue de 551,3 metros, un 84 % de la distancia teórica para población pediátrica sana. Las variables talla, presión arterial sistólica pretest y saturación arterial de oxígeno de reposo se asociaron significativamente con la distancia recorrida en el modelo de regresión lineal múltiple. No hubo asociación significativa en los metros caminados respecto de las variables sexo, estado nutricional, dignóstico cardiológico inicial, número de cirugías previas y edad al momento del bypass total de ventrículo derecho

A cross-sectional study was done in students with univentricular heart after undergoing total cavopulmonary connection (Fontan procedure) to establish their baseline functional capacity based on the six-minute walk test and identify potential determining factors. Thirty patients were included; their median age was 12 years old. Eighteen patients were males. The median distance walked was 551.3 meters, 84 % of the theoretical distance for a healthy pediatric population. Height, pre-test systolic blood pressure, and resting arterial oxygen saturation showed a significant association with the distance walked in the multiple linear regression model. No significant association was observed in the meters walked in terms of the following outcome measures: sex, nutritional status, baseline cardiological diagnosis, number of prior surgeries, and age at the time of Fontan procedure

Correlation of Six Minute Walk Test and Lung Function Test Variables (% FEV1, % FVC, % DLCO) in Patients with Connective Tissue Disorder - Interstitial Lung Disease

Interstitial Lung Diseases (ILDs) also known as diffuse parenchymal lung disease, include a group of diffuse parenchymal infiltrative lung diseases. A restrictive defect is the most frequent pulmonary abnormality in patients with pulmonary fibrosis which is the usual consequence of many ILDs. Connective tissue disorders are usually rare, but are potentially life threatening conditions. The spectrum of ILD varies from mucocutaneous symptoms, arthralgia / arthritis to impairment of pulmonary and renal function. Systemic Lupus Erythematosus (SLE), Systemic Sclerosis (SSc), Sjogren’s Syndrome (SS), inflammatory muscle diseases and overlap-syndromes are grouped together as connective-tissue disorders. Involvement of lung and its function is the most common form of interstitial lung disease, leading to high morbidity and mortality among the group of connective tissue disorders. We wanted to correlate the 6-Min Walk Distance (6MWTD) with the Pulmonary Function Test values such as % FEV1, % FVC and FEV1 / FVC, among patients with connective tissue disorder associated Interstitial Lung Disease in SRM Medical College Hospital, a tertiary care hospital in Tamilnadu, South India. MethodsThis study was done as a cross sectional analytical study among 31 patients in the Department of Respiratory Medicine, Rheumatology and General Medicine in SRM medical college and hospital. Each patient was explained the purpose of the study and the need for complete co-operation. Those who satisfied the inclusion and exclusion criteria were included. Data was collected using a structured proforma. 6-minute walk test and pulmonary function tests were performed and correlated. ResultsThere appears to be a significant correlation between 6-minute walk test, % desaturation, 6 Minute Walk Test Distance, 6 Minute Walk Test Pre BDI and 6 Minute Walk Test Post BDI with spirometry values especially with the Spirometry FEV 1 %, Spirometry FVC % and % predicted DLCO. Conclusions6MWT can be used as a useful surrogate for pulmonary function tests especially among the population where spirometry is not possible. 6MWT has good reproducibility, is simple to perform and can be used as a screening tool for Interstitial Lung Disease in connective tissue disorder patients.

Respuesta a la prueba de caminata de seis minutos en niños con riesgo cardiovascular / Response to the six-minute walk test in children with cardiovascular risk

INTRODUCCIÓN: El riesgo cardiovascular (RCV) se define como la posibilidad que tiene un sujeto de sufrir una enfermedad cardiovascular dentro de un determinado plazo de tiempo. Si bien la patología se hace sintomatica en etapa adulta, los cambios fisiopatológicos comienzan a desarrollarse en edades tempranas. OBJETIVO: Establecer la relación entre capacidad cardiorrespiratoria, estimada a través de la prueba de caminata de seis minutos (PC6M), y el RCV en niños con síndrome metabólico. PACIENTES Y MÉTODO: Se analizaron 42 niños, edad 5 a 15 años, que asistieron a la Unidad de Cardiología Infantil del Hospital Carlos Van Buren entre los años 2015 y 2017. Cada participante se categorizó de acuerdo al puntaje de RCV de Alustiza, que define 3 niveles de riesgo: bajo (0 a 6 puntos), medio (7 a 8 puntos) y alto (9 o más puntos), lo que se traduciría en una mayor probabilidad de desarrollar una enfermedad cardiovascular, y realizó concomitantemente la PC6M. RESULTADOS: La edad media del grupo de ni ños fue de 10,9 ± 2,7 años, con un Índice de Masa Corporal (IMC) = 31,0 ± 4,6 kg/m2 (z-score 3,2 ± 0,7). Los niños recorren 75,2 ± 8,9 por ciento de la distancia teórica, con un porcentaje de frecuencia cardíaca de reserva (FCR) = 31,0 ± 9,4. No se observaron relaciones estadísticamente significativas entre RCV y PC6M. CONCLUSIONES: No se encuentra relación entre la capacidad cardiorrespiratoria y RCV. Se cuestiona la utilidad de la PC6M para valorar el RCV en la población de estudio.

INTRODUCTION: Cardiovascular risk (CVR) is defined as the possibility of a subject suffering from car diovascular disease within a certain period. Although the pathology appears in adult life, the physiopathological changes start to develop at an early age. OBJECTIVE: To establish the relationship bet ween cardiorespiratory capacity (CRC)and CVR in children with metabolic syndrome. PATIENTS AND METHODS: We analyzed data corresponding to 42 children aged from 5 to 15 years who were seen at the Children's Cardiology Unit of the Carlos Van Buren Hospital between 2015 and 2017. Each parti cipant was categorized according to the Alustiza's CVR score, which defines 3 levels of risk: low (0 to 6 points), medium (7 to 8 points) and high (9 or more points), which representing a greater probability of developing cardiovascular disease, and performed 6MWT. RESULTS: The mean age of the children was 10.9 ± 2.7 years, body mass index (BMI) = 31.0 ± 4.6 kg/m2 (z-score 3.2 ± 0.7), percentage of theoretical distance walked = 75.2 ± 8.9, and percentage of heart rate reserve (HRR) = 31.0 ± 9.4. There was no statistical association between 6MWT and CVR. CONCLUSIONS: There is no relationship between the cardiorespiratory capacity and the CVR. The use of the 6MWT is questioned as an ins trument to assess CVR in the population under study.

Correlation of spirometry and six minute walk test in patients with chronic obstructive pulmonary disease from Sundargarh, Odisha, India

Background: Six‑Minute Walk Test (6MWT) is a simple, objective, reproducible test which correlated well with different spirometric indices, and thus able to predict severity of Chronic Obstructive Pulmonary Disease (COPD) and can replace spirometry in resource poor set‑up. Here, author evaluated the correlation of 6 minute walk distance (6MWD) with spirometric indices in COPD patients and the potential of 6MWT as an alternative to the assessment of severity of COPD.Methods: This cross-sectional observational study included a total of 80 COPD patients, diagnosed by GOLD criteria (Post bronchodilator FEV1/ FVC ratio <0.7). Modified Medical Research Council (mMRC) grading was used (age, weight, height, body mass index- BMI and breathlessness) and all the patients underwent spirometric measurement of FEV1, FVC and FEV1/ FVC ratio and tests were repeated after bronchodilation using 200-400 μg of salbutamol. 6MWT was performed following American Thoracic Society (ATS) protocol of 6MWT and distance was measured in meters.Results: Author found significant negative correlation of 6MWT with age (r=-0.384, p=0.00) and mMRC grading of dyspnea (r=-0.559, p=0.00) and significant positive correlation with height (r=0.267, p=0.019) and weight (r=0.293, p=0.008). Significant positive correlation of 6MWD was noted with post bronchodilator FEV1(r=0.608, p=0.00), FEV1% (r=0.429, p=0.00), FVC (r=0.514 p=0.00), FVC% (r=0.313 p=0.005), FEV1/FVC % (r=0.336, p=0.001). Positive correlation was also observed between 6MWT and BMI but statistically insignificant (r=0.177, p=0.116). There was significant negative correlation between 6MWT and GOLD staging (r=-0.536, p=0.00).Conclusions: This finding concludes that 6MWT can be used for the assessment of severity of disease in COPD patients in places where spirometry is not available.

Correlation of Sit to Stand Test with Six Minute Walk Test in Chronic Obstructive Pulmonary Disease Patients

Introduction: Functional status assessment in patients suffering with Chronic Obstructive Pulmonary Disease (COPD) is the essential component and Six-Minute Walk Test (6MWT) is a valid tool for it. The amount of physical activity possible in patients with chronic obstructive pulmonary disease (COPD) predicts exacerbations, hospital admissions, and mortality. Therefore, guidelines advocate the need to entitle improved physical activity status as a major target of treatment in such patients. Objective: To determine the correlation of sit to stand test with 6-minute walk test in patients with chronic obstructive pulmonary disease. Methodology: An analytical cross-sectional study was done in Chest Medicine department, Jinnah hospital, Karachi during 2015-16. A total of 100 patients with mildto-severe COPD were included in this study. The STST and 6MW Test was performed and compared with each other and with COPD Assessment Test (CAT). Results: Overall 100 patients were recruited for the study with mild-tosevere chronic obstructive pulmonary disease. The mean age of the patients was 60.50 ± 7.03 years. On applying the Correlation coefficient test, a moderate positive correlation was found between Sit to stand test and 6-minute walk test distance (r=0.71, p=0.0005). Mild positive correlation was also found in these patients between the Sit to stand test and chronic obstructive pulmonary disease Assessment Test score (STST and CAT r=0.46, p=0.011). Similarly, moderate positive correlation was found between 6-minute walk test distance and chronic obstructive pulmonary disease Assessment Test score (r=0.58, p=0.001). Conclusion: It is concluded that in COPD patients, the functional capacity can be assessed through STST instead of 6 MW Test having the same results.

Distância percorrida em indivíduos hipertensos: estudo de corte transversal / Distance travelled in hypertensive subjects: cross-sectional study

INTRODUÇÃO: A hipertensão arterial sistêmica é uma condição clínica ocasionada por diversos fatores que acarretam na elevação dos níveis de pressão arterial de forma sustentada, sendo importante avaliar a capacidade funcional desses indivíduos, visando ter-se um diagnóstico precoce, além de ser um meio de prevenção das repercussões da hipertensão. Um dos instrumentos utilizados é o teste de caminhada de seis minutos (TC6) que é executado em nível submáximo, possibilitando a análise das respostas dos sistemas envolvidos durante as atividades. OBJETIVOS: Verificar a distância percorrida dos indivíduos hipertensos. MATERIAIS E MÉTODOS: Estudo de corte transversal, com população de hipertensos, entre 30 e 60 anos. O TC6 foi realizado de acordo com protocolo padronizado pela ATS e calculada a distância prevista através da equação preditiva de Enright e Sherrill. Foi utilizado o teste T de Student para comparação das médias de distância e calculado o percentual da diferença entre os valores percorridos e previstos. RESULTADOS: 44 sujeitos de ambos os sexos foram avaliados e observou-se média de idade de 48,80±7,08 anos, 56,8% dos indivíduos apresentaram pressão controlada, 81,8% estavam em uso regular da medicação anti-hipertensiva. A média da distância obtida nos indivíduos que alcançaram os valores previstos foi de 503±38,6 metros. Sendo que a maioria dos indivíduos percorreram em média 86,3±7,2% da distância prevista. CONCLUSÃO: Indivíduos com hipertensão arterial apresentam diminuição da distância percorrida, independente da pressão arterial estar controlada ou não.

INTRODUCTION: Systemic arterial hypertension is a clinical condition caused by several factors that cause the elevation of blood pressure levels in a sustainable way, it is important to assess the functional capacity of these individuals, aiming to have an early diagnosis, in addition being a means of preventing the effects of hypertension. One of the instruments used is the six-minute walk test (6MWT) that runs in the submaximal level, enabling the analysis of the responses of the systems involved during the activities. OBJECTIVES: To determine the distance travelled of hypertensive individuals. MATERIALS AND METHODS: A cross-sectional study, with a population of hypertensive patients, between 30 and 60 years. The TC6 was performed according to a standardized protocol by the ATS and calculated the distance provided by the predictive equation of Enright and Sherril. The Student T test was used for comparison of the average distance and calculated the percentage difference between the values driven and laid down. RESULTS: 44 subjects of both genders were assessed, with an average age of 48.80±7.08 years, 56.8% of the individuals presented controlled pressure, 81.8% were in regular use of anti-hypertensive medication. The average distance obtained in individuals who have achieved the expected values was 503±38.6 meters. The majority of individuals have traveled on average 86.3±7.2% of the expected distance. CONCLUSION: Individuals with arterial hypertension have distance travelled reduced, whether blood pressure is controlled or not.

Six Minute Walk Test (6MWT) In Various Pediatric Conditions: A Literature Review

The Six Minute Walk Test (6MWT) was developed in 1963 by Balke to evaluate functional capacity. The test was developed in frail elderly patients 60-90 years of age referred to a geriatric hospital, and it targets community dwelling frail elders. However, the test has been used in a variety of chronic diseases, in adult and pediatric populations as well as in healthy adults and healthy pediatric population. It is a common outcome measurement tool used in physical therapy to determine ones basic exercise endurance and functional fitness. It is simple to perform, and it can help the physical therapist evaluate improvement or decline in one’s overall functional status during his/her rehabilitation program. It is a self paced sub maximal exercise test used to assess functional exercise capacity in patients with chronic diseases. The test has been used as an estimate of physical fitness in severe cardiopulmonary diseases, cystic fibrosis, juvenile idiopathic arthritis, etc in pediatric population. Knowledge about its measurement properties is needed to determine whether it is an appropriate test to use in paediatric population. The purpose of this study will be to systematically review all published clinimetric studies on the 6MWT in various pediatric conditions.

Adaptação cardiovascular no Teste de Caminhada dos Seis Minutos em pacientes com DPOC: estudo transversal / Cardiovascular adaptation in the six-minute walk test in COPD patients: transversal study

OBJETIVO: Avaliar o comportamento da adaptação cardiovascular e da saturação periférica de oxigênio em indivíduos com DPOC submetidos no teste de caminhada dos seis minutos (TC6). MATERIAL E MÉTODOS: Trata-se de um estudo de corte transversal, que foram incluídas pessoas com diagnóstico de DPOC, confirmado pela espirometria e de ambos os sexos. A magnitude de sintomas foi avaliada pela escala de dispneia Medical Research Council (MRC) e questionário COPD Assessment Test (CAT). Aplicou-se o TC6 para avaliar a tolerância ao esforço. Para mensurar a frequência cardíaca máxima (FC máx) prevista para a idade foram utilizadas equações específicas para população brasileira. RESULTADOS: Avaliou-se 34 indivíduos com DPOC, 20 (58,8%) homens; relação VEF1/CVF foi 56,7%± 10,2% pós broncodilatador (BD). Quatorze 14 (41,2%) indivíduos apresentaram impacto clínico moderado; 16 (47,2%) dos avaliados apresentou grau 2 na escala do MRC. As médias das distâncias percorridas no primeiro e segundo TC6 foram 383,5 ± 13,6; 408,6 ± 85,7 metros, correspondendo a 70, 75%; 75,10% em relação ao valor previsto (p=0,001). As médias da FC máx ao final do primeiro e segundo TC6, foram 94,1 ± 21,9; 92,3 ± 17,9 bpm e a FC pós percentual da FC máx prevista pré e pós TC6 foram 61,1% ± 17,7%; 59,7% ± 21,5% e 14 (41,2%) pacientes apresentaram dessaturação de O2 no primeiro TC6; 9 (26,5%) no segundo teste. CONCLUSÕES: Pacientes com DPOC, apresentam aumento da FC identificado pelo esforço submáximo, por meio do percentual da FC max. Indivíduos com maior comprometimento da função pulmonar apresentaram dessaturação de O2. .

OBJECTIVE: To evaluate the behavior of cardiovascular adaptation and peripheral oxygen saturation in individuals with COPD submitted to the six-minute walk test (6MWT). MATERIAL AND METHODS: It was performed a descriptive study with person with a diagnosis of COPD confirmed by spirometry of both sexes. The Medical Research Council (MRC) dyspnea scale and the COPD Assessment Test (CAT) questionnaire were used to assess the magnitude of symptoms. The 6MWT was used to assess effort tolerance. To measure the maximum heart rate (HRmax) predicted for age, specific equations were used for the Brazilian population. RESULTS: 34 individuals with COPD were evaluated, 20 (58.8%) men; FEV1 / FVC ratio was 56.7% ± 10.2% after BD. Fourteen (41.2%) were classified as grade 2 and were classified as grade 2 (MRC scale). The means of the distances covered in the first and second TC6 were 383.5 ± 13.6; 408.6 ± 85.7 meters, corresponding to 70.7%; 75.1% in relation to the predicted value (p = 0.001). The mean maximum heart rate at the end of the first and second 6MWT were 94.1 ± 21.9; 92.3 ± 17.9 bpm and the heart rate post-percentage of the predicted maximum heart rate before and after the 6MWT were 61.1% ± 17.7%; 59.7% ± 21.5% and 14 (41.2%) patients presented O2 desaturation on the 6MWT; 9 (26.5%) in the second test. CONCLUSIONS: Patients with COPD throughout the 6MWT show increased heart rate and O2 desaturation in exercise activity.

Relationship between gait speed and physical function in patients with symptomatic peripheral artery disease

OBJECTIVE: The aim of the study was to analyze the relationship between gait speed and measurements of physical function in patients with symptomatic peripheral artery disease (PAD). METHODS: One hundred sixty-nine patients (age 66.6±9.4 years) with symptomatic PAD were recruited. Usual and fast gait speeds were assessed with a 4-meter walk test. Objective (balance, sit-to-stand, handrip strength, and six-minute walk test) and subjective (WIQ - Walking Impairment Questionnaire and WELCH - Walking Estimated-Limitation Calculated by History) measurements of physical function were obtained. Crude and adjusted linear regression analyses were used to confirm significant associations. RESULTS: Usual and fast gait speeds were significantly correlated with all objective and subjective physical function variables examined (r<0.55, p<0.05). In the multivariate model, usual gait speed was associated with six-minute walking distance (β=0.001, p<0.001), sit-to-stand test score (β=-0.005, p=0.012), and WIQ stairs score (β=0.002, p=0.006) adjusted by age, ankle brachial index, body mass index, and gender. Fast gait speed was associated with six-minute walking distance (β=0.002, p<0.001), WIQ stairs score (β=0.003, p=0.010), and WELCH total score (β=0.004, p=0.026) adjusted by age, ankle brachial index, body mass index, and gender. CONCLUSION: Usual and fast gait speeds assessed with the 4-meter test were moderately associated with objective and subjective measurements of physical function in symptomatic PAD patients.

Ventilation distribution as a contributor to the functional exercise capacity in patients with systemic sclerosis-associated interstitial lung disease without pulmonary hypertension

Phenotypic differences have been described between patients with systemic sclerosis (SSc)-associated interstitial lung disease (ILD) and SSc-associated pulmonary hypertension, including performance differences in the 6-min walk test (6MWT). Moreover, the correlations between the 6MWT and traditional pulmonary function tests (PFTs) are weak, indicating the need to search for new parameters that explain exercise performance. Thus, our objective was to evaluate the impact of ventilation distribution heterogeneity assessed by the nitrogen single-breath washout (N2SBW) test and peripheral muscle dysfunction on the exercise capacity in patients with SSc-ILD and limited involvement of the pulmonary parenchyma. In this cross-sectional study, 20 women with SSc-ILD and 20 matched controls underwent PFTs (including spirometry, diffusing capacity for carbon monoxide (DLco), and the N2SBW test) and performed the 6MWT and knee isometric dynamometry. The 6-min walking distance (6MWD, % predicted) was strongly correlated with the phase III slope of the single-breath nitrogen washout (phase III slopeN2SBW) (r=−0.753, P<0.0001) and reasonably correlated with the forced vital capacity (FVC) (r=0.466, P=0.008) and DLco (r=0.398, P=0.011). The peripheral oxygen saturation (SpO2) during exercise was not significantly correlated with any of the pulmonary or muscle function parameters. The phase III slopeN2SBW was the only predictive variable for the 6MWD, whereas quadriceps strength and FVC/DLco were predictive variables for SpO2. Ventilation distribution heterogeneity is one factor that contributes to a lower 6MWD in SSc-ILD patients. In addition, muscle dysfunction and abnormal lung diffusion at least partly explain the decreased SpO2 of these patients.

Valores normales del test de marcha de 6 minutos en niños y adolescentes sanos: una revisión sistemática y metaanálisis / Normal values of 6-minute walk test in healthy children and adolescents: a systematic review and meta-analysis

INTRODUCCIÓN: El test de marcha de 6 minutos (TM6') es una prueba de ejercicio submáximo ampliamente utilizada en el contexto clínico, la cual, permite evaluar la capacidad física en niños sanos y con enfermedades asociadas. Para una adecuada interpretación del TM6' es necesario comparar el valor obtenido con un valor normal apropiado para la población de interés. El objetivo de este trabajo fue analizar los valores de normalidad del TM6', establecer valores de normalidad agrupados y evaluar su asociación con variables antropométricas y raciales en niños y adolescentes sanos. MÉTODOS: Revisión sistemática de la literatura realizada en 6 bases de datos electrónicas. Se incluyeron estudios de corte transversal que reportaran valores normales del TM6' en niños y adolescentes sanos. Los valores normales de la distancia recorrida (DR) fueron ponderados de acuerdo al tamaño muestral y se evaluó su asociación con el género, la edad y continente de procedencia del estudio. Los coeficientes de correlación entre la distancia recorrida y las variables predictoras fueron metaanalizados mediante el modelo de efectos aleatorios. RESULTADOS: A la revisión ingresaron 10 artículos que consideraron 5.352 individuos (51,9% hombres). El promedio ponderado de la DR fue de 619,8 m existiendo diferencia entre los grupos de edad, género y continente de procedencia. El metaanálisis de efectos aleatorios reveló una moderada asociación entre la DR y las variables estatura, peso y edad. CONCLUSIÓN: El TM6' se asocia con el género, continente y variables antropométricas. Las variables predictoras determinan un bajo porcentaje de la DR normal en niños y adolescentes.

INTRODUCTION: The 6-minute walk test (SMWT) is a submaximal exercise test widely used in the clinical setting, which allows the assessment of physical capacity in healthy and chronic children. For a proper interpretation of SMWT it is necessary to compare the value obtained by the patient with a normal value appropriate for the studied population. The aim of this study was to analyze the normal values of SMWT, in order to establish grouped normal values and to evaluate their association with anthropometric and racial variables in healthy children and adolescents. METHODS: Systematic review performed in 6 electronic databases. We included studies aimed at determining normal values of SMWT in healthy children and adolescents. Normal values of the SMWT were weighted according to the sample size and their association with the gender, age and continent of origin of the study was evaluated. Additionally, the correlation coefficients between the distance during SMWT and the pre dictor variables were meta-analyzed using the random effects model. RESULTS: The review included 10 articles that included 5352 individuals (51.9% men). The weighted average of the distance dur ing SMWT was 619.8 m, there being a difference between the age, gender and continent of origin groups. The meta-analysis of random effects revealed a moderate association between the distance and height, weight and age variables. CONCLUSION: SMWT is associated with gender, continent and anthropometric variables. However, the predictive variables determine a low percentage of normal walked distance in children and adolescents.

Binary cardiac rehabilitation in patients with acute myocardial infarction and the measurement of 6-minute Walk Test / 中华急诊医学杂志

Objective To study the effects of binary cardiac rehabilitation (CR) composed of hospital-based and home-based CR in patients after acute myocardial infarction (AMI) evaluated by six-minute walking distance (6MWD). Methods A total of 38 post-MI patients were divided into two groups, namely conventional CR group (n=20) and binary CR group (n=18). In the first seven days, CR training was carried out in all 38 patients in our hospital, and then 20 patients were kept at CR training in the hospital (hospital-based CR group), whereas the remaining 18 patients (binary CR group) got tele-monitored walking training at home for eight weeks (binary model). Before discharge from hospital based CR or after 8 weeks CR at home, all patients received Cardiopulmonary Exercise Testing and Six-minute Walk Test, and the data of patients' body mass index (BMI),thyroid function, serum lipid metabolism and echocardiography were collected before and after CR. Results After CR, BMI and low density lipoprotein (LDL) decrease in both groups compared with those before CR[hospital-based group: BMI, (25.99±3.36)kg/m2 vs. (23.04±3.72) kg/m2,P＜0.05; LDL, (3.40±1.38) mg/dl vs. (2.04±0.73)mg/ dl,P＜0.01; binary group: BMI, (24.84±2.70) kg/m2 vs. (22.88±2.56) kg/m2,P＜0.05; LDL, (3.40±1.01) mg/dl vs. (92.11±0.37) mg/dl,P＜0.01]. After 8 weeks CR at home or hospital based CR until discharge, the anaerobic threshold (AT), maximum rate of oxygen consumption (VO2max),metabolic equivalent (MET) and 6MWD improved significantly in both groups compared with those at 7 days after CR in hospital [Hospital-based group: AT, (12.37±1.53) mL/(kg. min) vs. (14.77±1.57) mL/(kg. min); VO2max (17.87± 1.66 mL/(kg. min) vs. (20.73±2.14) mL/(kg. min); MET (5.02±0.36) vs. (6.09±0.53); 6MWD (500±53.36) m vs. (582.5±57.6) m,P＜0.01; Binary group: AT, (12.56±1.11) mL/(kg·min) vs. (14.30±1.23) mL/(kg. min); V02max, (17.28±1.38) mL/(kg. min) vs. (20.02±1.37) mL/(kg. min); MET, (5.07±0.47)vs (5.94±0.46); 6MWD,(511.4±50.96) m vs. (590.3±56.1)m,P＜0.01]. There was no significant difference in CR effects observed between two groups (P＞0.05). Conclusions In post-MI patients,a binary model of CR training improved physical capacity and was a similarly effective form of CR as a entirely hospital-based approach. A home-based tele-monitored program facilitated patients' adherence to CR. The 6 minute walk experiment is economical and good evaluation on the CR effect of binary cardiac rehabilitation.

Consistency of Different Intensity Setting Methods of Aerobic Exercise for Coronary Heart Disease / 中国康复理论与实践

@#Objective To explore the consistency of different intensity setting methods of aerobic exercise in order to provide the safe and effective strength setting method for patients with coronary heart disease (CHD).Methods From July, 2016 to July, 2017, CHD patients in our hospital were recruited. The basic data were collected. The patients received cardiopulmonary exercise test firstly to obtain anaerobic threshold, peak oxygen intake and other indicators. They underwent Six-minute Walk Test after a day off. The target heart rate was calculated using anaerobic threshold method (AT), peak oxygen uptake index method (PI), heart rate reserve method (HRR), age estimates method (AE) and quiet heart rate plus 20 method (HR20), respectively. The correlation and consistency of different methods were analyzed.Results There was no correlation (r=-0.131, P>0.05) and there was a very significant difference (P<0.001) between AE and AT on determining target heart rate. There was no correlation (r=0.372, P>0.05) between HR20 and AT. There was correlation (r=0.872, P<0.01) and there was no significant difference (P>0.05) between PI and AT on determining the target heart rate, and the Bland-Altman test showed a consistency between them. There was correlation (r=0.836, P<0.001) and there was no significant difference (P>0.05) between HRR and AT on determining the target heart rate, and Bland-Altman test demonstrated a consistency between them.Conclusion There was no correlation and consistency of AE and HR20 to AT on the target intensity of aerobic exercise. There was significant correlation and consistency between AT and HRR/PI.

Changes in beat by beat heart rate slopes during six minute walk test among healthy adult Saudi male students

Clinically, six minute walk test (6MWT) is the most common exercise test. It is used to estimate the level of physical fitness among patients. The aim of this research to measure the beat by beat heart rate slopes instead of depending on the covered distance to predicate and estimate the level of physical fitness during 6MWT. Seventy (70) healthy adult male students aged between 18 to 27 years were recruited randomly from the general Saudi population in Riyadh. 6 MWT using 50 meter corridor was performed according to standardized American Thoracic Society (ATS) guidelines. Mean distance walked in 6 minutes (470.5±64.6 meters) and beat by beat heart rate (HR) was calculated by heart rate monitor. In addition Body mass index (BMI), Body surface area (BSA), Borg Rating of Perceived Exertion (BRPE) and Maximum predicted heart rate percentage (MPHRP) was also calculated. A stepwise regression equation was used to predict six minute walk test distance (6MWTD), six minute walk test slope (6MWTS) and recovery slope. There was a significant correlation between 6MWTS and the recovery slope (r= -0.460, p <0.001), 6MWTS with 6MWTD (r= 0.264, p<0.05) and recovery slope with 6MWTD (r= -0.249, p <0.05). In conclusion, both 6MWTS and recovery slope can predict the 6MWD

The Effects of Resting Physical Factors on Distance and Intensity of Six-Minute Walk Test in Healthy Female Subjects

PURPOSE: The purpose of this study was to examine the correlations among the resting physical factors related to a six-minute walk test (6MWT) and to determine the effects of the resting physical factors on the distance and intensity related to the 6MWT in healthy female subjects. METHODS: A total of 43 healthy female subjects (22.84±3.90 yrs) participated in this study. They performed the 6MWT, and the physical factors related to the 6MWT were assessed. SPSS 20.0 was used to analyze the data, and the mean and standard deviation were calculated, and the collected data were analyzed by the Pearson's correlation coefficient (among physical factors related to 6MWT) and independent t-test (between six-minute walk distance [6MWD] groups and six-minute walk intensity [6MWI] groups). RESULTS: The 6MWD had a significant negative correlation with the resting HR (beat/min) in healthy female subjects (r= −0.49, p < 0.05). The 6MWI had a significant negative correlation with the resting systolic blood pressure (SBP) (r= −0.45, p < 0.01). A comparison of the 6MWD revealed the long distance group (LDG, 700-799 m) to be significantly higher than the middle distance group (MDG, 600-699 m) in the 6MWI (%), %predicted distance (%), predicted VO2max (mL/kg/min), resting HR (beat/min), and resting SBP (mmHg)(p < 0.05). In the comparison of 6MWI, the moderate intensity group (MIG, 64-75%HRmax) was significantly lower than the low intensity group (LIG, 50-63%HRmax) in the resting SBP (mmHg) (p < 0.05). CONCLUSION: These results suggest that the resting physical factors are related to the 6MWD and 6MWI of the 6MWT in healthy females. In particular, SBP is associated with not only the 6MWD but also the 6MWI in 6MWT.