Table 2.

Effect of walking duration on the PPG and PGA

	Speed	Region	Duration						Paired t-test
			10 min (Mean ± SE)			20 min (Mean ± SE)			p-value
PPG	1.8 mph	T1	53.0	±	9.6	57.4	±	10.4	0.513
		M1	59.6	±	10.2	63.5	±	11.4	0.459
		M2	64.7	±	9.8	67.0	±	7.7	0.769
		HL	33.9	±	4.7	37.5	±	4.4	0.425
	3.6 mph	T1	77.6	±	11.6	79.8	±	15.2	0.841
		M1	73.9	±	14.0	93.2	±	19.1	0.116
		M2	70.7	±	11.7	81.8	±	16.4	0.539
		HL	42.6	±	5.9	67.8	±	15.1	0.082
	5.4 mph	T1	98.7	±	19.4	102.4	±	16.0	0.850
		M1	90.3	±	15.5	90.7	±	12.2	0.976
		M2	79.8	±	15.7	103.7	±	17.0	0.211
		HL	37.4	±	5.4	46.7	±	8.6	0.141
PGA	1.8 mph	T1	27.0	±	9.2	39.8	±	17.9	0.502
		M1	60.0	±	15.0	59.2	±	15.5	0.958
		M2	49.3	±	15.2	69.0	±	26.2	0.418
		HL	28.1	±	7.0	17.7	±	2.3	0.217
	3.6 mph	T1	16.4	±	2.6	27.8	±	10.5	0.244
		M1	32.3	±	7.3	26.8	±	8.1	0.571
		M2	31.8	±	10.4	21.7	±	7.2	0.415
		HL	24.6	±	2.5	36.2	±	14.2	0.451
	5.4 mph	T1	19.8	±	11.4	41.5	±	19.4	0.378
		M1	32.4	±	10.7	26.1	±	8.4	0.276
		M2	29.6	±	5.8	27.9	±	5.5	0.767
		HL	19.3	±	2.8	28.6	±	7.4	0.277

PPG Peak pressure gradient, PGA Pressure gradient angle, T1 First toe, M1 First metatarsal head, M2 Second metatarsal head, and HL Heel; Data are shown as mean ± standard errors