Reduction state of NAD(P)H and cytochrome b566. Mitochondria were incubated in media mimicking rest, mild aerobic exercise, or intense aerobic exercise (Table 1), as indicated. Values are means ± S.E. (error bars) (n = 3–20). *, p < 0.05; **, p < 0.01; ***, p < 0.0001, one-way ANOVA with Tukey's post hoc test.