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Fig. 3. Mean hip, knee, ankle and total joint work in level walking across all
subjects. Values are means ± s.d. Muscles at each joint produced both
negative and positive work during the stance phase of level walking. Net work
was negative at the knee but positive at the hip and ankle. Total net work was
positive at 16.2 J. The magnitudes of negative and positive work were
significantly different at each joint; the asterisk indicates the larger value
(P<0.010).