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. Author manuscript; available in PMC: 2018 Dec 1.
Published in final edited form as: Med Sci Sports Exerc. 2017 Dec;49(12):2404–2413. doi: 10.1249/MSS.0000000000001391

Figure 2. Intramuscular metabolic perturbation during high-intensity intermittent isometric single-leg knee-extensor exercise.

Figure 2

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.