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Impact of Protein vs. Carbohydrate Supplements on Muscle Recovery after Exercise‐Induced Muscle Soreness

We investigated whether protein (PRO [0.4g/kg]) vs. carbohydrate (CHO [0.4g/kg]) vs. placebo nutrition supplements would alleviate muscle soreness when consumed immediately after eccentric exercise in 21 untrained men aged 18–30 years. During this double‐blind randomized block study design, each subject completed three, 3‐day trials (separated by >2 weeks) identical except for treatment, with each serving as his own control. Trials began with a bout of right leg eccentric exercise (Biodex), followed by treatment. At 0 (baseline), 24, and 48 hours, data were collected: creatine phosphokinase (CPK) from pre‐exercise blood samples, subjective muscle soreness scale, and strength tests (power, torque, etc.). ANOVA indicated that exercise caused mild muscle damage evidenced by an overall day effect (p≤0.0001) for muscle soreness, with lowest median values (0 to 10 scale) on day 1 (0.7), increasing (p≤0.0001) on day 2 (3.2) and remaining elevated on day 3 (3.4). We also noted an overall day effect (p≤0.0001) for CPK, with lowest median values (U/L) on day 1 (136), increasing (p≤0.0001) on day 2 (235) and remaining elevated on day 3 (189). ANOVA revealed no significant treatment effect on indicators of soreness or damage during recovery. Our results indicate that a PRO or CHO supplement after exercise causing mild muscle damage does not facilitate muscle recovery in adequately nourished, healthy young men.