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Exercise tolerance [time to task failure (exhaustion)] in Leg1CON, Leg2CON, Leg1PL, Leg2PL-CONTRA, Leg1ACT, and Leg2ACT-CONTRA conditions. CON, control; PL, placebo; CONTRA, contralateral; ACT, acetaminophen. Values are means (SD). *Significantly different from Leg1 (P < 0.05).
