Abstract
Muscle dynamometer derived in vivo force-velocity parameters are commonly used to monitor changes with training, aging, and various muscle disease states. How well these parameters predict measures of functional status such as stair climbing, walking, or chair rising ability is unknown. We examined maximal isometric force (Po) peak power (PP), and maximal shortening velocity (Vmax) in twenty-one males and females (range: age, 22–93 yr.; height, 149–188 cm; weight, 56.6–89.4 kg; body fat, 12.3–51.0%). These measures were correlated with stair climbing (SC), chair rising (CR), and walking (W) time. Po correlated significantly (p < 0.05) with SC (r = 0.78), CR (r = 0.56), and W (r = 0.74). PP correlated significantly (p < 0.05) with SC (r = 0.74), CR (r = 0.54), and W (r = 0.74). Vmax correlated significantly (p < 0.05) with SC (r = 0.56), CR (r = 0.44), and W (r = 0.51). These results suggest that in vivo muscle force-velocity characteristics are appropriate measures to represent the functional status in young and old men and women. Supported by NIH Grants AG15833 and AG00831.
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