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Fig. 7. Mean joint work in stair gait across all subjects. Values are means
± s.d. Knee and ankle muscles were the primary energy dissipators and
generators in stair descent and ascent. They performed 92% and 95% of the
negative and net muscular work in descent, respectively and 85% and 87% of the
positive and net muscular work in ascent, respectively. As in ramp walking,
negative work in ramp ascent was relatively evenly distributed among the
muscle groups, whereas positive work in descent was produced primarily (i.e.
73%) by the ankle muscles.
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