Effects of age, speed, and step length on lower extremity net joint moments and powers during walking.

Effects of age, speed, and step length on lower extremity net joint moments and powers during walking. Hum Mov Sci. 2020 Jun;71:102611 Authors: Buddhadev HH, Smiley AL, Martin PE Abstract During walking older adults' gait is slower, they take shorter steps, and rely less on ankle and more on knee and hip joint moments and powers compared to young adults. Previous studies have suggested that walking speed and step length are confounds that affect joint moments and powers. Our purpose was to examine the effects of walking speed and step length manipulation on net joint moments and powers in young and older adults. Sixteen young and 18 older adults completed walking trials at three speeds under three step length conditions as marker position and force platform data were captured synchronously. Net joint moments were quantified using inverse dynamics and were subsequently used to compute net joint powers. Average extensor moments at each joint during the stance phase were then computed. Older adults displayed greater knee extensor moment compared to young adults. Older adults showed trends (p < .10) of having lower ankle and higher hip moments, but these differences were not statistically significant. Average ankle, knee, and hip extensor moments increased with speed and step length. At the fast speed, older compared to young adults generated lower average ankle power (p = .003) and showed a trend (p = .056) of exerting less ave...
Source: Human Movement Science - Category: Neurology Authors: Tags: Hum Mov Sci Source Type: research