Efeitos deletérios do Lockdown frente à COVID-19 sobre respostas à saúde de adolescentes com obesidade: um estudo longitudinal / Deleterious effects of COVID-2019 Lockdown on health responses in adolescents with obesity: longitudinal study

Trata-se de um estudo longitudinal e observacional que investigou as consequências do lockdown em decorrência do coronavírus em 2020, na aptidão física relacionada à saúde e respostas bioquímicas de 16 adolescentes do sexo masculino com sobrepeso ou obesidade (idade 12,6 ± 1,8 anos). A antropometria, composição corporal, testes de aptidão física e medidas de biomarcadores sanguíneos (glicemia em jejum, colesterol total [CT], colesterol de lipoproteína de baixa densidade [LDL-c], triglicerídeos [TG], aspartato aminotransferase [AST] e alanina aminotransferase [ALT]) foram avaliados antes e após 8 meses de lockdown. Os resultados mostraram um aumento do peso corporal, massa livre de gordura e circunferência da cintura e do quadril (p<0,05) após 8 meses. A força isométrica máxima de preensão manual e a flexibilidade aumentaram, enquanto a resistência muscular diminuiu (p<0,05). A glicemia em jejum, CT, LDL-c, TG, TG/glicose, AST, ALT, TG/HDL-c, CT/HDL-c e LDL/HDL aumentaram (p<0,05), ao passo que os níveis de HDL-c diminuíram significativamente (p<0,05). Portanto, 8 meses de isolamento social promoveram efeitos deletérios sobre parâmetros morfológicos e aptidão física em adolescentes. No entanto, o pequeno tamanho da amostra impede a generalização desses achados.

This longitudinal and observational study investigated the consequences of the coronavirus disease 2019 lockdown on health-related physical fitness and biochemical responses in 16 overweight or obese male adolescents (aged 12.6±1.8 years). The anthropometry, body composition, physical fitness tests, and measures of blood biomarkers (fasting blood glucose, total cholesterol [TC], low-density lipoprotein cholesterol [LDL-c], triglycerides [TG], aspartate aminotransferase [AST], and alanine aminotransferase [ALT]) were evaluated before and after 8 months of lockdown. The results showed increased body weight, fat-free mass, and waist and hip circumference (p<0.05) after 8 months. Maximum isometric handgrip strength and flexibility increased, while muscle endurance decreased (p<0.05). Fasting blood glucose, TC, LDL-c, TG, TG/glucose, AST, ALT, TG/HDL-c, CT/HDL-c, and LDL/HDL increased (p<0.05), while the HDL-c levels decreased significantly (p<0.05). Therefore, eight months of social isolation promoted harmful effects on adolescents' morphological parameters and physical fitness. However, the small sample size prevents the generalization of these findings.

Asociación entre la condición física y calidad de vida con la fragilidad en personas mayores / Association between physical fitness and quality of life with frailty in elderly

RESUMEN Introducción: El envejecimiento patológico provoca cambios anatomofisiológicos responsables de generar deterioro en la condición física y calidad de vida de las personas mayores. Así también se ha observado un aumento en la presencia de síndromes geriátricos como la fragilidad física. Objetivo: Determinar si existe asociación entre la condición física y calidad de vida con la fragilidad en personas mayores. Métodos: Estudio correlacional. Se incluyeron 84 personas mayores de 65 años (62 mujeres y 22 hombres) entre agosto y septiembre del año 2021 en las regiones metropolitana y Maule, Chile. Se midieron la condición física, calidad de vida y fragilidad. La condición física se evaluó con la batería Senior Fittnes Test y la calidad de vida fue medida con el cuestionario World Health Organization Quality of Life Old (WHOQOL-OLD). La fragilidad se determinó con el fenotipo de Fried. Se utilizaron tablas de contingencia para asociar las variables de estudio con la fragilidad a través de la prueba de ji cuadrado. Resultados: La fragilidad se asoció con algunos componentes de la condición física como fuerza del tren superior (p= 0,038), fuerza del tren inferior (p= 0,018), flexibilidad del tren inferior (p= 0,004), resistencia aeróbica (p= 0,038), agilidad y equilibrio dinámico (p= 0,002). También, se observaron asociaciones significativas con dimensiones de calidad de vida como autonomía (p= 0,007), actividades del pasado, presente y futuro (p= 0,018), participación social (p= 0,006) e intimidad (p= 0,038). Conclusión: Existe asociación entre fragilidad con dimensiones de calidad de vida y con variables de la condición física.

ABSTRACT Introduction: Pathological aging causes anatomophysiological changes responsible for generating deterioration in the physical condition and quality of life of the elderly. Thus, an increase in the presence of geriatric syndromes such as physical frailty has also been observed. Objective: To determine if there is an association between physical condition and quality of life with the frailty in older adults. Methods: Correlational study. 84 people over 60 years of age (62 women and 22 men) were included. Physical fitness, quality of life and frailty were measured. Physical fitness was assessed with the Senior Fitness Test battery and quality of life was measured with the World Health Organization Quality of Life Old (WHOQOL-OLD) questionnaire. Frailty was determined with the Fried phenotype. Contingency tables were used to associate the study variables with frailty through the Chi-square test. Results: Frailty was associated with some components of physical fitness such as upper body strength (p= 0.038), lower body strength (p= 0.018), lower body flexibility (p= 0.004), aerobic endurance (p= 0.038), agility and dynamic balance (p= 0.002). Also, significant associations were observed with quality of life dimensions such as autonomy (p= 0.007), past, present and future activities (p= 0.018), social participation (p= 0.006) and intimacy (p= 0.038). Conclusion: There is an association between frailty with dimensions of quality of life and with variables of physical fitness.

Proposal of a normative table for classification of body fat percentage in Brazilian jiu-jitsu athletes / Propuesta de tabla normativa para la clasificación del porcentaje de grasa corporal en atletas de jiu-jitsu brasileño

SUMMARY: Previous evidence indicates that body fat can distinguish Brazilian jiu-jitsu (BJJ) athletes according to the competitive level. However, propositions of cut-off points for establishing classifications of body fat percentage for combat sports athletes and, specifically, for BJJ athletes are still incipient in the literature. In this sense, the main aim of the present study was to establish a normative table for the classification of body fat percentage in BJJ athletes. As a secondary aim, athletes were compared according to competitive level. Ninety male BJJ athletes (aged: 29.0 ± 8.2 years; practice time: 6.0 ± 2.1 years; body mass: 82.1 ± 12.7 kg; height: 175.9 ± 6.5 cm; fat mass: 16.0 ± 8.9 kg; bone mineral content: 3.7 ± 0.6 kg; muscle mass: 37.9 ± 5.4 kg; body fat percentage: 17.3 ± 6.8 %; basal metabolic rate: 1811.4 ± 193.4 kcal) from different competitive levels: state (n= 42), national (n= 26) and international (n= 22) took part in this study. All athletes had their body composition measured via tetrapolar bioelectrical impedance. Percentiles p10, p25, p50, p75, and p90 were used to establish the classification. As a result, the following classification was obtained: <7.7 % (very low); ≥7.7-11.5 % (low); 11.6-17.0 % (medium); 17.1-24.0 % (high) and ≥24.1 % (very high). State-level athletes had a higher fat percentage than national and international-level athletes (p<0.05). The proposed cut-off points can help professionals responsible for sports training and nutritional prescription in monitoring the body fat of BJJ athletes.

RESUMEN: La grasa corporal puede distinguir a los atletas de jiu-jitsu brasileño (BJJ) según el nivel competitivo. Sin embargo, las propuestas de puntos de corte para establecer clasificaciones de porcentaje de grasa corporal para deportistas de deportes de combate y, específicamente, para deportistas de BJJ son aún incipientes en la literatura. En este sentido, el objetivo principal del presente estudio fue establecer una tabla normativa para la clasificación del porcentaje de grasa corporal en atletas de BJJ. Secundariamente, comparar a los deportistas según el nivel competitivo. Participaron noventa atletas masculinos de BJJ (edad: 29,0 ± 8,2 años; tiempo de práctica: 6,0 ± 2,1 años; masa corporal: 82,1 ± 12,7 kg; estatura: 175,9 ± 6,5 cm; masa adiposa: 16,0 ± 8,9 kg; contenido mineral óseo: 3,7 ± 0,6 kg; masa muscular: 37,9 ± 5,4 kg; porcentaje de grasa corporal: 17,3 ± 6,8 %; tasa metabólica basal: 1811,4 ± 193,4 kcal) de diferentes niveles competitivos: estatal (n= 42), nacional (n= 26) e internacional (n= 22). Se evaluó la composición corporal a través de bioimpedancia tetrapolar. Para establecer la clasificación se utilizaron los percentiles p10, p25, p50, p75 y p90. Como resultado se obtuvo la siguiente clasificación: <7,7 % (muy bajo); ≥7,7-11,5 % (bajo); 11,6-17,0 % (medio); 17,1-24,0 % (alto) y ≥24,1 % (muy alto). Los atletas de nivel estatal tenían un porcentaje de grasa corporal más alto respecto a los atletas de nivel nacional e internacional (p <0.05). Los puntos de corte propuestos pueden ser útiles para monitorizar la grasa corporal de los atletas de BJJ.

Relación entre actividad física y calidad de vida en adolescentes durante la pandemia por la COVID-19

RESUMEN Introducción: La pandemia por la COVID-19 ha generado distanciamiento social, lo cual provoca disminución de la práctica de actividad física y menor calidad de vida relacionada con la salud. Objetivo: Relacionar el nivel de actividad física con la calidad de vida relacionada con la salud, en adolescentes, durante el confinamiento por la COVID-19. Métodos: Estudio transversal que evaluó 184 estudiantes (61,4 % mujeres) con una edad media de 13,97 + 1,69 años, residentes en la región del Maule, Chile. Se emplearon dos encuestas de autoaplicación, la versión corta del Cuestionario Internacional de Actividad Física y la versión validada en población chilena, del KIDDO-KINDL. Resultados: Se presentó correlación directa y significativa entre el tiempo total de actividad física leve con la autoestima (p= 0,043) y, entre el tiempo total sentado con el bienestar emocional (p= 0,025), autoestima (p= 0,014), escuela (p= 0,031) y puntaje total de calidad de vida (p= 0,006) para el total de la muestra. Solo las mujeres presentaron correlación (p< 0,05) entre el tiempo total sentado con la familia, escuela y puntaje total de calidad de vida. Además, se encontraron diferencias significativas (p< 0,05) en el tiempo total de actividad física moderada, escuela y puntaje total de calidad de vida a favor de los hombres. Conclusión: Existe relación entre el tiempo total de actividad física con la autoestima y, entre el tiempo total sentado con el bienestar emocional, autoestima, escuela y puntaje total de calidad de vida en adolescentes durante el confinamiento por la COVID-19.

ABSTRACT Introduction: The COVID-19 pandemic has generated social distancing, causing a decrease in the practice of physical activity and a lower health-related quality of life. Objective: To relate the level of physical activity with health-related quality of life in youth, during COVID-19 lockdown. Methods: Cross-sectional study that evaluated 184 students (61,4 % female) with a mean age of 13,97 + 1,69 years, residing in the Maule region, Chile. Two self-application surveys were applied, with the short version of the International Physical Activity Questionnaire and the valid version in the Chilean population of the KIDDO-KINDL. Results: There was a direct and significant correlation between the total time of mild physical activity with self-esteem (p= 0,043) and, between the total sitting time with emotional well-being (p= 0,025), self-esteem (p= 0,014), school (p= 0,031), and total quality of life score (p= 0,006) for the total sample. Only females showed a correlation (p< 0,05) between total time sitting with family, school, and total quality of life score. In addition, significant differences (p< 0,05) were found in the total time of moderate physical activity, school, and total quality of life score in favor of males. Conclusion: There is a relationship between the total time of physical activity with self-esteem and between the total sitting time with emotional well-being, self-esteem, school, and total quality of life score in youth during COVID-19 lockdown.

Effects of a high-intensity interval training program on body composition and physical fitness in female field hockey players / Efectos de un programa de entrenamiento intervalado de alta intensidad sobre la composición corporal y condición física en jugadoras de hockey césped

SUMMARY: High-intensity interval training (HIIT) is zed by achieving similar effects to conventional physical and physiological training in a shorter time, allowing its dissemination in the sports field. The present study was aimed to analyze the effects of a HIIT program on body composition and general and specific physical fitness in Chilean female field hockey players. Experimental, repeated measures, simple blind, parallel groups, and a quantitative approach were used. The participants were randomized, and distributed into a control group (CG; n= 10) that maintained regular field hockey training and an experimental group (EG; n= 10) that also received complementary training with HIIT. Body composition (muscle mass and adipose mass), general physical fitness (jump performance with countermovement jump [CMJ] and maximum oxygen consumption [VO2max] were evaluated with the test Course-Navette), and specific physical fitness (pushing speed, dribbling speed, and shooting accuracy) were assessed with established protocols. Pre- and post-intervention comparisons were made with Student's t and Wilcoxon tests, considering p<0.05. The main results indicate that the EG presented a significant increase in muscle mass (p = 0.024; d = 0.62), CMJ (p = 0.005; d = 1.10), VO2max (p = 0.001; d = 1.58) and a significant reduction in adipose mass (p = 0.023; d = 0.36) and time in pushing speed (p = 0.028; d = 0.79). The CG did not present significant changes in any of the variables analyzed, and no significant differences were reported between the groups. In conclusion, eight weeks of HIIT significantly increases muscle mass, jump performance, and VO2max and significantly reduces adipose mass and time in pushing speed in Chilean female field hockey players.

RESUMEN: El entrenamiento intervalado de alta intensidad (EIAI) se caracteriza por conseguir en un menor tiempo efec- tos similares al entrenamiento convencional a nivel físico y fisiológico, lo que ha permitido su difusión en el ámbito deportivo. El objetivo del presente estudio fue analizar los efectos de un programa de EIAI sobre la composición corporal, condición física general y específica en mujeres chilenas que practican hockey césped. Estudio experimental, de medidas repetidas, simple ciego, grupos paralelos y enfoque cuantitativo. Las participantes fueron aleatorizadas y distribuidas en grupo control (GC; n=10) que mantuvo los entrenamientos regulares de hockey césped y grupo experimental (GE; n=10) que además recibió de complemento EIAI. Se evaluó la composición corporal (masa muscular y masa adiposa), condición física general (capacidad de salto con el salto contra movimiento [CMJ] y consumo máximo de oxígeno [VO2máx] con la prueba Course de Navette) y condición física específica (velocidad de empuje, velocidad de dribling y precisión de tiro) con protocolos establecidos. Se realizaron comparaciones pre y post intervención con las pruebas t de Student y Wilcoxon, considerando un p<0,05. Los principales resultados indican que el GE presentó un aumento significativo de la masa muscular (p=0,024; d=0,62), CMJ (p=0,005; d=1,10), VO2máx (p=0,001; d=1,58) y, una reducción significativa, de la masa adiposa (p=0,023; d=0,36) y del tiempo en la velocidad de empuje (p=0,028; d=0,79). El GC no presentó cambios significativos en ninguna de las variables analizadas, mientras que no se reportaron diferencias significativas entre los grupos. En conclusión, ocho semanas de EIAI aumentan significativamente la masa muscular, capacidad de salto y VO2máx, además de reducir significativamente la masa adiposa y el tiempo en la velocidad de empuje en mujeres chilenas que practican hockey césped.

Effects of intra-set rest on morphological variables, maximal strength and jump performance in university students / Efectos del descanso intra-serie sobre variables morfológicas, fuerza máxima y saltabilidad en estudiantes universitarios

SUMMARY: The appropriate dosage of resistance training could promote physical and physiological adaptations and decrease injuries. The aim of the study was to analyze the effects of the different intra-set rest after eight weeks of resistance training on morphological variables, maximal strength, and jump performance in physically active university students. Twenty-five students (15 men and 10 women) were randomized by sex and distributed in Control Group (CG) (n=8) with rest only at the end of the series; Experimental Group 1 (EG1) (n=9) with an intra-set rest of 30 s, and Experimental Group 2 (EG2) (n=8) with four intra-set rest of 10 s. Morphological variables [body weight, bipedal height, body mass index (BMI), fat mass and muscle mass], maximum upper body strength (bench press and military press), lower body strength [parallel squat (45°) and deadlift], as well as countermovement jump (CMJ) were measured. All three groups obtained a significant increase (p0.05); thereby, there is an equivalent increase in muscle mass, maximal strength, jump performance, and a fat mass reduction.

RESUMEN: La dosificación adecuada de ejercicios de resistencia muscular permite favorecer adaptaciones físicas y fisiológicas, y reducir lesiones. El objetivo de este estudio fue analizar los efectos de distintos tiempos de descanso intra-serie luego de ocho semanas de ejercicios de resistencia muscular sobre variables morfológicas, fuerza máxima y saltabilidad en estudiantes universitarios físicamente activos. Veinticinco estudiantes (15 hombres y 10 mujeres) fueron aleatorizados por sexo y distribuidos en: grupo control (GC) (n=8) con descanso sólo al final de la serie; grupo experimental 1 (GE1) (n=9) con un descanso intra-serie de 30 s y grupo experimental 2 (GE2) (n=8) con cuatro descansos intra-serie de 10 s. Se midieron variables morfológicas [peso corporal, estatura bípeda, índice de masa corporal (IMC), masa adiposa y masa muscular], fuerza máxima del tren superior (press de banco plano y press militar) e inferior [sentadilla paralela (45°) y peso muerto] y saltabilidad con el salto contramovimiento (CMJ). Se obtuvo un aumento significativo (p<0,01) del peso corporal e IMC y, una reducción significativa (p<0,01) de la masa adiposa en los tres grupos. La masa muscular aumentó significativamente (p<0,01) en el GC y GE1. La fuerza máxima del tren superior e inferior aumentaron significativamente (p<0,05) en los tres grupos y para todos los ejercicios, mientras que el CMJ aumentó significativamente en el GC y GE1. No existen diferencias significativas entre distintos tiempos de descanso intra-serie cuando se utiliza el mismo volumen, intensidad y descanso total durante las series de ejercicios, logrando un aumento equivalente en masa muscular, fuerza máxima, saltabilidad y reducción de la masa adiposa.

Association between fitness, anthropometric indices and laboratory parameters in elderly women

ABSTRACT Background: Aging causes an involution of anthropometric and health indices that can affect physical fitness. Aim: To determine the influence of anthropometric and health indices on the physical fitness of elderly women. Material and Methods: Anthropometric parameters, serum lipids, blood glucose and physical fitness evaluated using Senior Fitness Test, were assessed in 140 women aged 70 ± 5 years. The association between parameters was analyzed using Pearson's correlation coefficient and multiple regression models. Results: In the regression models serum lipids and the suprailiac skinfold were significant predictors of the up and go test (R2= 0.48). HDL cholesterol and the level of physical activity were predictors of the two minutes step test (R2= 0.31). Serum lipids, suprailiac skinfold and age were predictors of the back-scratch test (R2= 0.41). Fasting blood glucose and HDL cholesterol were predictors of the chair sit and reach test (R2= 0.24). Serum lipids and body mass index were predictors of the arm curl test (R2= 0.37). Body mass index and serum lipids were predictors of the chair stand test (R2= 0.49). Conclusions: Anthropometric variables, serum lipid levels and blood glucose were predictors of different physical fitness parameters in these women.

Antecedentes: El envejecimiento causa involución de indices antropométricos y de salud, los cuales pueden afectar la condición física. Objetivo: Determinar la influencia de indices antropométricos y de salud sobre la condición física de mujeres mayores. Material y Métodos: Se evaluaron parámetros antropométricos, lípidos séricos y la condición física mediante el "senior fitness test" en 140 mujeres de 70 ± 5 años. La asociación entre variables se evaluó mediante correlaciones simples y modelos de regresión múltiple. Resultados: En los modelos de regresión múltiple, los lípidos séricos y pliegue suprailíaco fueron predictores significativos de la prueba de levantarse, caminar y volver a sentarse (R2 = 0,48). El colesterol HDL y el nivel de actividad física fueron predictores de la prueba de dos minutos de marcha (R2 = 0,310). Los lípidos séricos, el pliegue suprailíaco y la edad fueron predictores de la prueba de juntar las manos tras la espalda (R2 = 0,41). La glicemia en ayunas y el colesterol HDL fueron predictores de la prueba de flexión del tronco en silla (R2 = 0,24). El índice de masa corporal y los lípidos séricos fueron predictores de la prueba de flexo-extensión de codo (R2= 0,37). El índice de masa corporal y los lípidos séricos fueron predictores de la prueba de sentarse y levantarse de una silla (R2 = 0,49). Conclusiones: Las variables antropométricas, los lípidos séricos y la glicemia fueron predictores de diversas pruebas de capacidad física en mujeres mayores.

Factores asociados a una baja calidad de vida en adultos chilenos durante la cuarentena por COVID-19

Background: The quarantine and social distancing implemented during COVID 19 pandemic may hamper the quality of life of the population. Aim: To determine the factors associated with a low quality of life during COVID 19 quarantine in Chilean adults. Material and Methods: The SF-36 survey about quality of life was answered by 1,082 Chilean adults aged between 18 and 60 years, who were quarantined by the COVID-19 health alert. Other variables studied were sociodemographic background, nutritional status, lifestyles, level of physical activity, sedentary behavior and sleep hours. Risk factors associated with low quality of life were identified by logistic regression analysis for each of the 8 dimensions evaluated in the SF-36 questionnaire. Results: The factors that increased the probability of having a lower general health perception were being female (Odds ratio (OR) = 1.29; p = 0.05), being physically inactive (OR = 2.76 p < 0.01), unhealthy hours of sleep (OR = 1.58, p < 0.01), smoking (OR = 1.59, p < 0.01) and eating junk food (OR = 2.26; p < 0.01). For the other dimensions of quality of life, the most frequently repeated factors were being female, junk food consumption, and being physically inactive and sedentary. Conclusions: There are factors associated with a low quality of life during the quarantine of the COVID-19 pandemic in the Chilean population. Their identification could reinforce remedial actions at the government level to benefit the health of the population during this health emergency.

Visceral adiposity index as a tool for cardiometabolic risk in obese older women / Índice de adiposidade visceral como ferramenta para avaliar o risco cardiometabólico em idosas obesas

OBJECTIVE: To correlate anthropometric measurements, lipid profile, cardiorespiratory fitness, and visceral adiposity index (VAI) in sedentary obese older women. METHODS: Twenty-seven insufficiently active and overweight older women were included in this cross-sectional study. We evaluated their anthropometric profile (body weight and stature, body mass index, waist and hip circumferences) and body composition (fat mass, body fat percentage, and musculoskeletal mass). Venous blood samples were analyzed for high and low-density lipoproteins (HDL-c and LDL-c), triglycerides (TG), and the LDL/HDL ratio. Peak oxygen uptake (VO2 peak) was measured using an adapted Bruce test using direct spirometry. We tested data normality and applied Pearson's correlation, assuming a p < 0.05. RESULS: The following correlations were observed: VAI and HDL (r = -0.53); VAI and LDL (r = 0.35); VAI and TG (r = 0.86); VAI and TG/HDL (r = 0.99) and VAI and VO2 peak (r = -0.55), with p ≤ 0.01 for all analyses. CONCLUSION: The findings suggested that VAI may be used as a tool to assess cardiometabolic risk in obese older women. Future studies should evaluate the applicability of VAI as a cardiometabolic risk factor indicator in older adults.

OBJETIVO: Correlacionar medidas antropométricas, perfil lipídico, aptidão cardiorrespiratória e índice de adiposidade visceral (IAV) em idosas obesas sedentárias. METODOLOGIA: Vinte e sete idosas insuficientemente ativas e com sobrepeso foram incluídas neste estudo transversal. Foram avaliados o perfil antropométrico (peso corporal e estatura, índice de massa corporal, circunferências da cintura e quadril) e composição corporal (massa gorda, percentual de gordura corporal e massa musculoesquelética). Amostras de sangue venoso foram analisadas para lipoproteínas de alta e baixa densidade (HDL-c e LDLc), triglicerídeos (TG) e a relação LDL/HDL. O consumo de oxigênio de pico (VO2 pico) foi medido usando um teste de Bruce adaptado usando espirometria direta. Testamos a normalidade dos dados e aplicamos a correlação de Pearson, assumindo um p ≤ 0,05. RESULTADOS: Foram observadas as seguintes correlações: IAV e HDL (r = -0,53); IAV e LDL (r = 0,35); IAV e TG (r = 0,86); IAV e TG/HDL (r = 0,99); e IAV e VO2 pico (r = -0,55), com p <0,01 para todas as análises. CONCLUSÃO: Os achados sugerem que o IAV pode ser utilizado como ferramenta para avaliar o risco cardiometabólico em idosas obesas. Estudos futuros devem avaliar a aplicabilidade do IAV como indicador de fator de risco cardiometabólico em idosos.

Changes in anthropometric parameters and physical fitness in older adults after participating in a 16-week physical activity program / Cambios en los parámetros antropométricos y la condición física en adultos mayores luego de participar en un programa de actividad física de 16 semanas

Abstract Introduction: Physical activity is important for achieving healthy aging. Objective: To analyze changes in anthropometric parameters and physical fitness among Chilean older adults after participating in a 16-week physical activity program and to evaluate whether there were differences in relation to their baseline nutritional status or not. Materials and methods: Pre-experimental quantitative study. The study population consisted of 176 older adults (155 women and 21 men) distributed in three groups: normal weight (n = 56), overweight (n=67) and obese (n = 53). The following variables were evaluated: body mass index (BMI), waist circumference (WC), waist-to-height ratio (WHR) and physical fitness. Results: Significant decreases between pre- and post-measurements were found for WC (p<0.001), BMI (p=0.015), and WHR (p<0.001). Improvements were observed in the following tests: chair stand (p<0.001), arm curl (p<0.001), 2-min step (p<0.001), chair sit-&-reach (p=0.018) and back scratch (p=0.014). Regarding BMI, significant changes were observed between normal weight vs. overweight participants (p=0.001) and between normal weight vs. obese participants (p=0.001). Conclusion: Older adult participants that regularly attended the physical activity program were able to reduce their WC, BMI and WHR, and also improved their physical-functional performance on the chair stand, arm curl, 2-min step, chair sit-&-reach and back scratch tests. In addition, anthropometric parameters and physical fitness also improved regardless of their baseline nutritional status.

Resumen Introducción. La actividad física es de gran importancia para lograr un envejecimiento saludable. Objetivos. Estudiar los cambios en los parámetros antropométricos y la condición física de adultos mayores (AM) chilenos después de 16 semanas de participación en un programa de actividad física, y evaluar las diferencias en relación con su estado nutricional inicial. Materiales y métodos. Estudio pre-experimental cuantitativo. Población: 176 AM (155 mujeres y 21 hombres) distribuidos en 3 grupos: normopesos (n = 56), sobrepesos (n=67) y obesos (n = 53). Se evaluaron las siguientes variables: índice de masa corporal (IMC), perímetro de cintura (PC), índice cintura-estatura (ICE) y condición física. Resultados. Se observaron reducciones significativas en PC (p<0.001), IMC (p=0.015) e ICE (p<0.001), y mejoras en las siguientes pruebas: sentarse y levantarse de una silla (p<0.001), flexiones del codo (p<0.001), dos minutos de marcha (p<0.001), flexión del tronco en silla (p=0.018) y juntar las manos tras la espalda (p=0.014). Se encontraron diferencias significativas respecto al IMC entre participantes normopesos y sobrepesos (p=0.001), y entre normopesos y obesos (p=0.001). Conclusión. Los AM que participaron regularmente en el programa de actividad física lograron reducir su PC, IMC e ICE y mejorar su rendimiento físico-funcional en las pruebas de sentarse y levantarse de una silla, flexiones de codo, dos minutos de marcha, y flexibilidad del tren inferior y superior. Además, sus parámetros antropométricos y su condición física mejoraron independientemente de su estado nutricional inicial.

Control postural en niños con sobrepeso y obesidad: una revisión de la literatura / Postural control in children with overweight and obesity: A review of literature

RESUMEN El sobrepeso y obesidad infantil se han convertido en un problema de salud a nivel mundial. A medida que la incidencia y la gravedad del sobrepeso y la obesidad siguen aumentando en niños y niñas, la determinación de los efectos fisiológicos y consecuencias funcionales se hacen cada vez más importantes. Estas últimas han sido las menos estudiadas, subestimándose su impacto sobre el desempeño motor. El control postural juega un papel importante en el desarrollo motor del niño, ya que es necesario para lograr nuevas posturas en etapas tempranas de la vida y para la adquisición de habilidades motoras más complejas. Esta revisión revela que los niños y niñas con sobrepeso y obesidad presentan un déficit del control postural evidenciado principalmente a partir de evaluaciones estáticas en una plataforma de fuerza y el análisis de la excursión del centro de presión. Entre las causas de la alteración del equilibrio en los niños y niñas con exceso de peso destaca la interacción de factores mecánicos, sensoriales y neuromusculares. Un pobre control postural provocaría un aumento del riesgo de caídas y lesiones, retraso en el desarrollo motor, limitaciones de la movilidad, alteración de la marcha y dificultad para la adquisición de otras habilidades motoras.

ABSTRACT Overweight and childhood obesity have become a global health problem. As the incidence and severity of overweight and obesity in children continue to rise, determining the physiological effects and functional consequences are becoming increasingly important. The latter have been the least studied, underestimating its impact on motor performance. Postural control plays an important role in the motor development of the child, as it is necessary to achieve new postures in the early stages of life and to acquire more complex motor skills. This review reveals that children with overweight and obesity have a deficit of postural control evidenced mainly from static assessments in a force platform and the analysis of the excursion of the center of pressure. Among the causes of impaired balance in overweight children is the interaction of mechanical, sensory and neuromuscular factors. Poor postural control would lead to an increased risk of falls and injuries, delayed motor development, limited mobility, impaired gait, and difficulty in acquiring other motor skills.

Variations in glenohumeral movement control when implementing an auditory feedback system: A pilot study / Variaciones en el control del movimiento glenohumeral al implementar un sistema de retroalimentación auditiva: un estudio piloto

Abstract Introduction: Human motor control requires a learning process and it can be trained by means of various sensory feedback sources. Objective: To determine variations in glenohumeral movement control by learning in young adults exposed to an auditory feedback system while they perform object translation tasks classified by difficulty level. Materials and methods: The study involved 45 volunteers of both sexes (22 women), aged between 18 and 32 years. Glenohumeral movement control was measured by means of the root mean square (RMS) of the accelerometry signal, while task execution speed (TES) was measured using an accelerometer during the execution of the task according to its difficulty (easy, moderate and hard) in four stages of randomized intervention (control, pre-exposure, exposure-with auditory feedback, and post-exposure). Results: Statistically significant differences (p<0.001) were found between the pre-exposure and exposure stages and between pre-exposure and post-exposure stages. A significant increase (p <0.001) in TES was identified between the pre-exposure and exposure stages for tasks classified as easy and hard, respectively. Conclusion: The use of an auditory feedback system in young adults without pathologies enhanced learning and glenohumeral movement control without reducing TES. This effect was maintained after the feedback, so the use of this type of feedback system in healthy individuals could result in a useful strategy for the training of motor control of the shoulder.

Resumen Introducción. El control del movimiento humano requiere de un proceso de aprendizaje y puede ser entrenado por medio de la retroalimentación proveniente de diversas fuentes sensoriales. Objetivo. Determinar variaciones en el control del movimiento glenohumeral por aprendizaje en adultos jóvenes sometidos a un sistema de retroalimentación auditiva, mientras realizan tareas de traslación de objetos clasificadas por nivel de dificultad. Materiales y métodos. Participaron 45 voluntarios de ambos sexos (22 mujeres) entre 18 y 32 años. El control del movimiento glenohumeral se midió por medio de la raíz media cuadrática de acelerometría, mientras que para la velocidad de ejecución de la tarea (VE) se usó un acelerómetro durante la ejecución de tareas según dificultad (fácil, moderado y difícil) en cuatro etapas aleatorizadas de intervención (control, pre-exposición, exposición con retroalimentación auditiva y post-exposición). Resultados. Se encontraron diferencias significativas (p<0.001) entre las etapas pre-exposición y exposición, y entre pre-exposición y postexposición. Se identificó un aumento significativo de la VE entre pre-exposición y exposición para tareas con clasificación fácil y difícil. Conclusión. El uso de un sistema de retroalimentación auditiva en adultos jóvenes sin patologías podría favorecer el aprendizaje y el control del movimiento glenohumeral sin disminuir la VE, resultado que se mantiene luego de la retroalimentación, por lo que el uso de un sistema de retroalimentación auditiva en individuos sanos podría resultar en una estrategia útil para el entrenamiento del control motriz del hombro.

Valores de referencia para la batería de pruebas Senior Fitness Test en mujeres mayores chilenas físicamente activas / Reference values for the senior fitness test in Chilean older women

Background:: The Senior Fitness Test (SFT) is frequently used to assess physical fitness and functional independence in older people. Aim: To establish reference values for the SFT in Chilean physically active older women according to age ranges. Material and Methods: Cross-sectional study that included 1048 Chilean women aged between 60 and 85 years. Chair stand (CS), arm curl (AC), two-min walk (2 min), chair sit-and-reach (CSr), back scratch (BS), and timed up-and-go test (TUG) were evaluated. The reference values are presented in percentiles (p5, p10, p25, p50, p75, p90 and p95) and are distributed age intervals (60-64, 65-69, 70-74, 75-79 and ≥ 80 years). Results: There was a decrease in strength (CS and AC), aerobic resistance (2 min) and flexibility (CSr and BS) along with age, whereas the time required to perform the timed up and go increased along with age. Conclusions: Physically active older women show a deterioration in physical fitness along with age. These women have higher reference values in CS, AC, 2 min and CSr, and lower in BS and TUG, than those reported abroad for the SFT.

Factores de riesgo asociados a bajo nivel de actividad física y exceso de peso corporal en estudiantes universitarios / Levels of physical activity and excess body weight in university students

Background: University students are considered a vulnerable group due to their adoption of unhealthy diets and lifestyles. Aim: To determine the main risk factors associated with low level of physical activity and excess body weight in university students. Material and Methods: This cross-sectional study included 358 university students from Talca, (53% female). Sociodemographic, academic, health, lifestyle, nutritional status, physical activity and sedentary behavior variables were analyzed by logistic regression. Results: Men were more likely to present excess body weight than women (Odds ratio (OR): 2.16 [95% CI: 1.17-4.01], p = 0.01). Similarly, those with low level of physical activity (OR: 2.13 [95% CI: 1.10-414], p = 0.03), musculoskeletal injuries (OR: 2.43 [95% CI: 1.09-6.34], p = 0.05) and smokers (OR: 2.09 [95% CI: 1.05-4.14], p = 0.04) were more likely to have excess body weight. Individuals with excess body weight (OR: 2.94 [95% CI: 1.31-6.61], p < 0.01), high sedentary behaviors (OR: 2.01 [95% CI: 1.04-4.55], p = 0.04), those who spent more than 7 hours per week studying (OR: 2.11 [95% CI: 1.06-4.66], p = 0.04), and those with presence of musculoskeletal injuries (OR: 1.49 [95% CI: 1.06- 3.66], p = 0.04) were more likely to be physically inactive. In addition, men were 73% less likely to have low physical activity levels compared to women (OR: 0.27 [95% CI: 0.11-0.56], p < 0.01). Conclusions: University students have several modifiable risk factors associated with low levels of physical activity and excess weight. Healthy lifestyles promotion should modify these risk behaviors.

Ecuación para predecir el consumo máximo de oxígeno a partir de la prueba de caminata de seis minutos en jóvenes sanos / An equation to predict maximum oxygen consumption from the six-minute walk test in healthy young adults

Background: The six-minute walk test (SMWT) is an easy-to-use test that measures walking distance. Aim: To elaborate an equation to estimate the maximum oxygen consumption (VO2 max) using the results of the SMWT. Material and Methods: Forty men and 40 women aged 22.5 ± 2 years, underwent a SMWT to measure the total walked distance and the recovery heart rate (RhR) Also, VO2 max was estimated from the maximal workload achieved in a cyclo-ergometer using the Storer test. A multivariate regression analysis resulted in a prediction equation that was validated with distributional assumptions of normality, independence and homoscedasticity. The limits of concordance of the predictive model were checked with the Bland-Altman diagram. Results: Body mass index (BMI), sex, RhR and total walked distance explained VO2 max variance by 3.4, 73.1, 17.9 and 32.8%, respectively. The prediction equation achieved was VO2 max (ml.min−1) = −3672.585 + (966.472 × Sex [1: female, 2: male]) + (-18.492 X RhR [beats.minute−1]) + (9.191 X Distance [m]) + (87.707 × BMI). The R2 of the equation was 0.91 (p < 0.01). Conclusions: This equation predicts VO2 max in Chilean university students according to sex, BMI, cardiovascular response and performance in the SMWT.

Asociación entre índices antropométricos de salud y condición física en mujeres mayores físicamente activas / Association between health anthropometric indexes with physical fitness in physically active elderly women

Resumen: Objetivo: Asociar los índices antropométricos de salud con la condición física de las mujeres mayores (MM) que participan en talleres de ejercicio físico. Material y métodos: Participaron 272 mujeres chilenas mayores de 60 años. Las variables correspondieron al IMC, perímetro de cintura (PC), índice cintura estatura (ICE) y condición física (CF). Se realizaron correlaciones a través del coeficiente de Pearson o Spearman, y asociaciones bivariadas mediante ji cuadrada de Pearson y el test exacto de Fisher, considerando un p<0.05. Resultados: De las MM, 70.8% alcanzó sobrepeso u obesidad; y 68.8% y 96% riesgo cardiometabólico de acuerdo con PC e ICE, respectivamente. Su CF presentó un rendimiento igual (53.5%) o superior (33.8%) según su edad y sexo. Se encontraron correlaciones inversas entre estado nutricional y riesgo cardiometabólico con las pruebas de CF (excepto la agilidad y equilibrio dinámico, en donde la relación fue directa), y asociación directa con juntar manos. Conclusiones: El exceso de peso en MM físicamente activas no afecta su rendimiento físico-funcional; sin embargo, el riesgo cardiometabólico se asocia inversamente con la funcionalidad motriz.

Abstract: Objective: To associate health anthropometric indexes with physical fitness of elderly women (EW) who participate in physical exercise workshops. Materials and methods: 272 Chilean women over 60 years took part in the study. The variables studied were BMI, waist circumference (WC), waist-height index (WHI) and physical fitness (PF). Correlations were made through the Pearson or Spearman coefficient, and bivariate associations using Pearson's Chi-square and the Fisher's exact test, considering p<0.05. Results: 70.8% of the EW were overweight or obese; 68.8% and 96% were at cardiometabolic risk due to their WC and WHI, respectively. Their PF showed equal performance (53.5%) or higher (33.8%) according to their age and gender. Inverse correlations were found between nutritional status and cardiometabolic risk with PF tests (except for agility and dynamic balance [direct]), and direct association with back scratch test. Conclusions: Excess weight in physically active EW would not affect their physical-functional performance; however, cardiometabolic risk would be inversely associated with motor function.

Actividad física y perfil de estilos de vida promotores de la salud en adultos mayores chilenos / Association of sedentariness and health promoting lifestyles in older adults

Background Part of having healthy lifestyles should be a regular practice of physical activities. Aim To evaluate the association between the practice of physical activity and healthy lifestyles in older people. Material and Methods The Health-Promoting Lifestyle Profile survey was applied to 1688 older people living in the community, aged 72 ± 7 years (61% women). This survey includes questions about regular physical activity. Results Twenty four percent of surveyed participants declared to practice physical activities at least three times per week, without gender differences. Sedentariness increased along with age. There was a negative association between low physical activity and healthy lifestyles (odds ratio (OR): 3.2 confidence intervals (CI): 2.3-4.5). There was also an association between sedentariness and low self-realization (OR 2.4 CI: 1.8-3.3), low responsibility with health (OR 1.6 CI: 1.22.1), low concern about nutrition (OR 1.8 CI: 1.4-2.4), low stress management (OR 2.0 CI: 1.5-2.7) and low interpersonal support (OR 2.0 CI: 1.5-2.6). Conclusions Sedentariness is negatively associated with health promoting lifestyles in this group of older people.