Figure 3: Plasma CK (muscle damage marker) increased only after 500-m trial (duration: 142 s). No change was found after 200-m trial (duration: 54.5 s). *Denotes significant difference against Pre, P < 0.05. †Denotes significant difference against the 200-m race at the same time point, P < 0.05. CK: Creatine kinase.