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Associação entre potência muscular mensuradas em diferentes testes de sentar e levantar e a variabilidade do torque em indivíduos idosos : estudo correlacional
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Introdução: A potência dos membros inferiores, avaliada pelo teste de sentar e levantar (STS), e a variabilidade do torque são preditores sensíveis da funcionalidade em idosos.
Porém, a relação entre eles em idosos é pouco conhecida. Métodos: Este estudo teve como objetivo analisar a relação entre a potência muscular, mensurada por diferentes testes de STS, e a variabilidade do torque em indivíduos idosos. Neste estudo participaram 38 homens e mulheres idosos saudáveis. Foram mensuradas a contração isométrica máxima dos extensores do joelho num dinamómetro isocinético, e posteriormente mensurada a variabilidade do torque. A potência muscular durante a execução dos testes de STS foi avaliada a partir de três diferentes métodos: com encoder, na plataforma de força e por fórmula. Os participantes realizaram os testes de STS na plataforma de força e com o encoder com repetições lentas e rápidas, enquanto para o cálculo a partir da fórmula os praticantes realizaram o maior número de repetições de sentar e levantar em 30 segundos. Resultados: Foram encontradas correlações significativas positivas entre a variabilidade do torque e a potência absoluta e relativa, medida pelo encoder (R² ≈ 0,17– 0,39; p < 0,001), quando o teste de STS foi executado de maneira lenta e rápida. Também, foi observada corelação significativa entre a variabilidade do torque e a potência avaliada na plataforma de força de forma lenta (R² ≈ 0,12; p < 0,001). Por fim, também foi encontrado correlação significativa entre a variabilidade e a potência obtida pela fórmula (R² ≈ 0,39; p < 0,001). Conclusão: A potência muscular avaliada por diferentes testes de STS, mostraram correlação moderadas e significativas com a variabilidade do torque.
Também, sugerem uma maior sensibilidade da relação entre a variabilidade e a potência muscular nos STS avaliada pelo encoder e pela fórmula.
Introduction: Lower limb power, as measured by the sit-to-stand (STS) test, and torque variability have been identified as sensitive predictors of functionality in older adults. However, the relationship between these two factors in older adults remains to be fully elucidated. Methods: The main objective of this study was to examine the correlation between muscle power, as determined by various STS tests, and torque variability in older subjects. The study's participants comprised 38 healthy older adults. The maximum isometric contraction of the knee extensors was measured using an isokinetic dynamometer, followed by measurement of torque variability. The assessment of muscle power during the execution of the STS tests was conducted using three distinct methods: with an encoder, on a force platform, and by formula. Participants performed the STS tests on the force platform and with the encoder at slow and fast repetitions. For the calculation using the formula, they performed the highest possible number of sit-to-stand repetitions in 30 seconds. Results: A substantial positive correlation was identified between torque variability and both absolute and relative power measured with the encoder (R² ≈ 0.17–0.39; p < 0.001), during the execution of the STS test at both slow and fast speeds. A significant correlation was also observed between torque variability and power assessed on the force platform at slow speed (R² ≈ 0.12; p < 0.001). A significant correlation was identified between torque variability and power obtained using the formula (R² ≈ 0.39; p < 0.001). Conclusion: The assessment of muscle power through various STS tests demonstrated a moderate and statistically significant correlation with torque variability. The findings also suggest a greater sensitivity of the relationship between torque variability and muscle power when STS is assessed by the encoder and by the formula.
Introduction: Lower limb power, as measured by the sit-to-stand (STS) test, and torque variability have been identified as sensitive predictors of functionality in older adults. However, the relationship between these two factors in older adults remains to be fully elucidated. Methods: The main objective of this study was to examine the correlation between muscle power, as determined by various STS tests, and torque variability in older subjects. The study's participants comprised 38 healthy older adults. The maximum isometric contraction of the knee extensors was measured using an isokinetic dynamometer, followed by measurement of torque variability. The assessment of muscle power during the execution of the STS tests was conducted using three distinct methods: with an encoder, on a force platform, and by formula. Participants performed the STS tests on the force platform and with the encoder at slow and fast repetitions. For the calculation using the formula, they performed the highest possible number of sit-to-stand repetitions in 30 seconds. Results: A substantial positive correlation was identified between torque variability and both absolute and relative power measured with the encoder (R² ≈ 0.17–0.39; p < 0.001), during the execution of the STS test at both slow and fast speeds. A significant correlation was also observed between torque variability and power assessed on the force platform at slow speed (R² ≈ 0.12; p < 0.001). A significant correlation was identified between torque variability and power obtained using the formula (R² ≈ 0.39; p < 0.001). Conclusion: The assessment of muscle power through various STS tests demonstrated a moderate and statistically significant correlation with torque variability. The findings also suggest a greater sensitivity of the relationship between torque variability and muscle power when STS is assessed by the encoder and by the formula.
Descrição
Dissertação para obtenção do grau de mestre na Escola Superior de Saúde Egas Moniz
Palavras-chave
Idosos Potência muscular Teste de sentar e levantar Variabilidade do torque