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Neuromuscular fatigue following the three 5-km cycling time trials. A: maximal voluntary contraction (MVC). NORM, normoxia; HCTRL, control hyperoxia; HFENT, fentanyl hyperoxia. B: quadriceps twitch torque (Qtw). C: voluntary quadriceps activation (VA). *P < 0.05 vs. NORM and HCTRL.
