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Time to completion, muscle activation, and power output during the 5-km cycling time trials. A: time to complete the 5-km time trials. NORM, normoxia; HCTRL, control hyperoxia; HFENT, fentanyl hyperoxia. B: vastus lateralis EMG normalized to the EMG response recorded during preexercise maximal voluntary contraction (MVC). C: power output during the time trials. *P < 0.05 vs. NORM, †P < 0.05 vs. HCTRL.
