Potential role of optimal velocity as a qualitative factor of physical functional performance in women aged 72 to 96 years.
OBJECTIVE
To assess the relationship of maximal leg power and its corresponding determinants (eg, optimal velocity and optimal torque) measured during maximal voluntary knee extension to physical functional performance of older women.


METHODS
Descriptive.


METHODS
Community retirement homes.


METHODS
Women (N=39) aged 72 to 96 years.


METHODS
Not applicable.


METHODS
Volunteers performed in sitting position maximal knee extensions on an Ergopower dynamometer to calculate maximal leg power, optimal velocity, and optimal torque. Three standardized tests were also performed to evaluate physical performance: walking speed over 6m, time taken to rise 5 times from a chair, and time to climb 6 stairs.


RESULTS
On multiple regression analysis, leg power (mean, 1.37+/-0.80 W/kg) significantly correlated with physical performance as measured by 6-m walking speed (mean, .85+/-.40 m/s), chair-stand time (mean, 16.3+/-7.7s), and stair-climb time (mean, 7+/-4s), describing 16% to 33% of the variance. Optimal velocity (mean, 1.79+/-1.20 rad/s) also significantly correlated with 6-m walking speed, chair-stand time, and stair-climb time, describing 46% to 89% of the variance. Optimal torque (50.8+/-16.9 Nm) did not correlate with physical performance.


CONCLUSIONS
Maximal power and moreover optimal velocity were thus found to be determinants of physical performance, both appearing as significant mobility factors in older adults. This may provide more focus on velocity-oriented training as a means of improving functional status.
Clémençon
Michel
M
Université de Lyon, Lyon, France. michel.clemencon@univ-lyon1.fr
Hautier
Christophe A
CA
Rahmani
Abdel
A
Cornu
Catherine
C
Bonnefoy
Marc
M
D000203:Activities of Daily Living; D000368:Aged / Q000502:physiology*; D000369:Aged, 80 and over / Q000502:physiology*; D005260:Female; D006801:Humans; D053580:Muscle Strength / Q000502:physiology*; D053581:Muscle Strength Dynamometer; D010809:Physical Fitness / Q000502:physiology*; D012016:Reference Values; D012044:Regression Analysis; D016138:Walking / Q000502:physiology