Fig. 4.

Changes in Cw (A), averaged Cw during slower and faster three stages (B), and comparisons of the economical speed (C) in three environmental conditions. Values of plots (A) and bar graphs (B,C) are means±s.d. In A, each mark indicates the same as in Fig. 1, and each line curve was obtained using a quadratic function. In C, each line graph indicates an individual data of the ES. Cw, energy cost of walking; ES, economical speed. * and ^† indicate the same as in Fig. 1.