The purpose of this study was to assess the effects of chocolate milk (supplement) ingestion on rating of perceived exertion (RPE), muscular peak strength, and fatigue following a bout of lower body resistance training. Seven male subjects (age = 24.1±3.1 years, mass = 85.7±11.2 kg, height = 179.3±4.6 cm) performed a baseline testing session on an isokinetic dynamometer to determine peak knee concentric flexion and extension torque at 60 and 120 deg?s-1, and fatigue during 30 repetitions of knee flexions and extensions at 180 deg?s-1. On separate days, a standardized lower body resistance training protocol was performed. Five minutes after, subjects ingested the supplement or an artificially sweetened non-caloric placebo of equal volume (such that supplement carbohydrate (CHO) content equaled 0.5 g CHO?kg -1 of body mass), and again performed the isokinetic testing 60 minutes following the resistance training bout. RPE of the training session was recorded prior to isokinetic testing. The supplement significantly reduced RPE compared to the placebo (5.85±1.46 vs. 7.14±1.57). The resistance training protocol generally did not induce decrements in peak torque output, or an increased level of muscular fatigue compared to baseline. Peak knee flexion torque was increased significantly at 120 deg?s-1 compared to baseline in the supplement condition. The supplement significantly reduced knee flexion fatigue compared to placebo. Ingestion of chocolate milk reduces acute RPE, and may reduce muscular fatigue, from a resistance training bout. These findings may lead to enhanced acute recovery for individuals who perform multiple bouts of anaerobic activity throughout a day.
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