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Fig. 6. The net excursion at a joint during a single step, measured from the difference between angle at toe-down and angle at toe-off, as a function of acceleration. Positive values indicate net joint extension and negative numbers indicate joint flexion. The hip and the ankle extended more as acceleration increased, while the knee underwent less flexion. The tarsometatarsal–phalangeal (TMP) joint extended less as acceleration increased. Linear regressions (N=49) are shown for hip extension, y=5.13x+12.3, r²=0.51, P<0.01; knee, y=11.52x–69.64, r²=0.76, P<0.01; ankle, y=11.93x–18.98, r²=0.80, P<0.01; TMP, y=–2.98x+23.85, r²=0.19, P<0.01.

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