Modest dose of two grams of L-arginine per day makes athletes even fitter
Most of the studies in which researchers administer L-arginine to humans are disappointing. The amino acid has zero effect. That may be because researchers are using L-arginine in doses which are too high for humans, we have sometimes sighed. Nutritional scientists from Mashhad University of Medical Sciences in Iran have published research that strengthens us in this belief. According to the Iranians, L-arginine makes soccer players fitter. In a modest dose of 2 grams per day...
The researchers divided 56 male soccer players, aged between 16 and 35, into 2 groups. The subjects in one group took 2 grams of L-arginine every day for 45 days, the subjects in the other group received a placebo. Before and after the supplementation period, the researchers determined the maximal oxygen uptake [VO2max] of the subjects. The maximal oxygen uptake is the main determinant of endurance.
The researchers used the Harvard Step Test to determine the VO2max of the football players indirectly.
The supplementation had no effect on the body composition of the subjects, but made them fitter. Their maximum oxygen intake increased significantly.
"Two grams per day L-arginine intake during 45 days could increase the sport performance in male athletes, but have no effect on anthropometric measurements, including BMI, body fat mass and lean body mass", the researchers wrote.
"Further studies based on determination of L-arginine dose and with a larger sample size are needed to shed light our findings."
Eur J Clin Nutr. 2017 Apr;71(4):544-8.
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