Figure 3. Maximal activities and protein content of mitochondrial enzymes in skeletal muscle throughout 2 weeks of high-intensity interval training.

A, citrate synthase (CS). B, β-hydroxyacyl CoA dehydrogenase (β-HAD). C, COX-IV. Values are means ±s.e.m. for 9 subjects. *Significantly different from Pre, #significantly different from 1st-4 h, †significantly different from 1st-24 h, ‡significantly different from 3rd-24 h (P < 0.05).