Table 1.

Means ± SD of minimum and maximum ground reaction force (GRF) during stance across 10 subjects and over 100 trials at three walking speeds.

	Slow	Normal	Fast	Trend
Y1 (% BW)	1.019 ± 0.066	1.122 ± 0.092	1.389 ± 0.131*,**	↑
Y2 (% BW)	0.856 ± 0.057	0.696 ± 0.078	0.495 ± 0.102*,**	↓
Y3 (% BW)	1.074 ± 0.059	1.133 ± 0.089	1.143 ± 0.111*
X1 (% BW)	−0.143 ± 0.029	−0.209 ± 0.051	−0.292 ± 0.065*,**	↓
X3 (% BW)	0.170 ± 0.023	0.213 ± 0.034	0.252 ± 0.046*,**	↑

Y1 and Y3, first and second peak of the vertical GRF, respectively; Y2, minimum value plateau between Y1 and Y3; X1 and X3, first and second peak of the anterior–posterior GRF, respectively (see Fig. 3).

BW, body weight.

^*Statistically different between fast and slow speed groups at alpha = 0.05.

^**Statistically different between fast and normal speed groups at alpha = 0.05.