1. Muscle-Power Quality: Does Sex or Race Affect Movement Velocity in Older Adults?
- Author
-
Doldo, Neil A., Delmonico, Matthew J., Bailey, Jason A., Hand, Brian D., Kostek, Matthew C., Rabon-Stith, Karma M., Menon, Kalapurakkal S., Conway, Joan M., Carignan, Craig R., and Hurley, Ben F.
- Subjects
MUSCLE contraction ,MUSCLE motility ,MUSCLE strength testing ,SEXUAL dimorphism ,RACIAL differences ,KNEE ,RANGE of motion of joints ,HEALTH of older people ,OLDER people physiology - Abstract
To determine sex and race differences in muscle power per unit of muscle contraction, knee-extensor muscle power normalized for knee-extensor muscle volume was measured in 79 middle-aged and older adults (30 men and 49 women, age range 50–85 years). Results revealed that women displayed a 38% faster peak movement velocity than men and African Americans had a 14% lower peak movement velocity than Whites of a similar age when expressed per unit of involved muscle (p < .001). As expected, men exhibited greater knee-extensor strength and peak power per unit of muscle than women, but women had a faster knee-extension movement velocity per unit of muscle than men at the same relative strength level. Moreover, African Americans had greater knee-extensor muscle volume than Whites but exhibited lower knee-extensor strength and lower movement velocity per unit of muscle when tested at the same relative strength levels. [ABSTRACT FROM AUTHOR]
- Published
- 2006
- Full Text
- View/download PDF