Impact of Arginine Supplementation on Hormonal Levels in Trained Endurance Athletes during Recovery Period
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PurposeTo study the effect of arginine (AR) supplementation during a sevenday training period on selected hormones in endurance swimmers.Methods20 male swimmers (age=305yr) were assigned into either AR (n=10) or placebo (PL) (n=10) groups. Pre and posttraining continuous 1500meter swimming tests were performed. Fasting blood samples were obtained at rest, 0, 5, 30, and 60min during recovery.ResultsInsulin levels were lower in the AR compared to the PL group at 0min [A: 11.862.8; P: 18.668.3 ng/ml, P=0.033]; however, it increased at 5min recovery point [A: 24.97.01; P: 8.975.4 ng/ml, P=0.000]. The testosterone levels were higher in the AR compared to the PL group at 30min [A: 6.031.7; P: 3.910.7 ng/ml, P=0.003] and 60min recovery points [A: 5.571.9; P: 3.610.97 ng/ml, P=0.013]. The cortisol levels were lower in the AR compared to the PL group at 5min [A: 1569.3; P: 198.441.8 ng/ml, P=0.005] and 30min recovery points [A: 147.1134; P: 188.2545 ng/ml, P=0.027]. Despite some trends in growth hormone levels, no significant increases were observed between groups (P>0.05).ConclusionAR supplementation elevates selected hormonal levels, which may improve recovery in athletes.
