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Comparisons of the effect of walking speeds on the PPG and PGA of the four plantar regions at two walking durations. A PPG at 10 min walking duration. B PPG at 20 min walking duration. C PGA at 10 min walking duration. D PGA at 20 min walking duration. Data are shown as mean ± standard errors. *, a significant difference (p < 0.05). PPG, peak pressure gradient; PGA, pressure gradient angle; T1, first toe; M1, first metatarsal head; M2, second metatarsal head; and HL, heel
