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Fig. 2. Gait elements within stance phase for a typical stride. (A) Midstance
elements were defined as follows: foot strike is the first kinematic frame in
which the foot (labeled by the TPj kinematic marker) contacts the trackway;
foot off is the first kinematic frame in which the foot rises from the
trackway; toe off is the first frame in which the foot begins a second, larger
arc about the tip of the phalanges; swing phase is the first frame of swing
phase. Adapted from Gatesy
(1999). (B) The timing of
midstance elements relative to peak nGRF for 16 strides. Mean occurrence time
for each gait element is indicated; values are means ± s.e.m. Negative
times indicate the element occurred before peak nGRF, while positive times
indicate it occurred after. Foot off was coincident with peak nGRF (mean
difference 0±0.01 s, N=16 strides).
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