Purpose: To investigate the association of knee-extensor strength and power to performance in the 30-second sit-to-stand test (30sSTS) in healthy older adults. Method: In a cross-sectional study of 29 healthy older adults aged 60-82 years (12 male, 17 female), hierarchical regression was used to determine the relationship of knee-extensor concentric and eccentric strength, peak rate of torque development (peak RTD) using isokinetic dynamometry, and momentum variables with the number of sit-to-stand repetitions completed in 30 seconds (30sSTSreps). Results: Concentric (180 /s) and eccentric (90 / s) knee-extensor strength were significant independent predictors of 30sSTSreps after controlling for physical activity level, height and weight (adjusted R 2 ¼ 0.425, p ¼ 0.004; adjusted R 2 ¼ 0.427, p ¼ 0.004 respectively), as was concentric (90 /s) knee-extensor peak RTD (adjusted R 2 ¼ 0.424, p ¼ 0.004). Peak linear vertical momentum (PLVM) (adjusted R 2 ¼ 0.615, p < 0.001) accounted for 36% of the variance. Conclusions: Generation of PLVM is an important predictor of 30sSTSreps; knee-extensor concentric and eccentric strength and power are associated with improved performance in this common functional task. Focusing on these parameters in exercise interventions may improve functional performance and give insight into specific factors related to success on the test.Key Words: aged; biomechanics; muscle strength; muscle strength dynamometer; risk factors; sit-to-stand. RÉ SUMÉObjectif : É tudier le lien entre la force et la puissance de l'extenseur du genou et le rendement au cours d'un test assis-debout de 30 secondes (TAD30s) chez des adultes â gé s en bonne santé . Mé thode : Au cours d'une é tude transversale portant sur 29 adultes en bonne santé â gé s de 60 à 82 ans (12 hommes, 17 femmes), on a utilisé une ré gression hié rarchique pour dé terminer le lien entre la force concentrique et excentrique de l'extenseur du genou, le taux maximal de production du moment de force (RTD maximal) au moyen de la dynamomé trie isokiné tique, et les variables de la quantité de mouvement en fonction du nombre de ré pé titions assis-debout complé té es en 30 secondes (ré pTAD30s). Ré sultats : La force concentrique (180 /s) et excentrique (90 /s) de l'extenseur du genou constituait un pré dicteur indé pendant significatif de repTAD30s compte tenu du niveau d'activité physique, de la taille et du poids (R 2 rajusté ¼ 0,425, p ¼ 0,004; R 2 rajusté ¼ 0,427, p ¼ 0,004 respectivement), tout comme l'é tait le RTD de pointe concentrique (90 /s) de l'extenseur du genou (R 2 rajusté ¼ 0,424, p ¼ 0,004). La quantité de mouvement vertical liné aire de pointe (MVLP) (R 2 rajusté ¼ 0,615, p < 0,001) a repré senté 36 % de la variation. Conclusions : La production du MVLP constitue un pré dicteur important des ré pTAD30s. On é tablit un lien entre la force et la puissance concentriques et excentriques de l'extenseur du genou et une amé lioration du rendement dans cette tâ che fonctionnelle courante. La concentration de l'attention sur ...
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