Fig. 4. Respiration of human skeletal muscle myoblasts. Endogenous cellular respiration (ng atom O/min/1 × 106cells) was measured for human skeletal muscle myoblast cells cultured in galactose medium. The rate of respiration during nonphosphorylating conditions was obtained from cells with increased concentrations of bupivacaine in the cuvette. Bars represent mean ± SD for five parallel experiments; P < 0.001 with one-way analysis of variance and * P < 0.05 versus control and 0.1 μm, with Student– Newman–Keuls post hoc test.