Figure 2. Intramuscular metabolic perturbation during high-intensity intermittent isometric single-leg knee-extensor exercise.
Intramuscular metabolite concentrations were obtained using 31P-MRS during control (CTRL) and fentanyl (FENT) conditions. Main effects and interactions are indicated in the graphs. Values are mean ± SEM for each contraction up to the last common time point prior to task failure for all participants and at task failure. † significantly different from CTRL at specific time point.