Fig. 3
From: Energy cost and lower leg muscle activities during erect bipedal locomotion under hyperoxia
Comparisons of muscle activities and mean power frequency (MPF) at the energetically optimal transition speed (EOTS) on each gradient. a Muscle activities on the level and b uphill gradient. c MPF on the level and d uphill gradient. “W” and “R” represent walking and running, respectively. +p < 0.05, *p < 0.01, and #p < 0.001