Ohtani, M., Maruyama, K., Titchenal, C. A., & Kobayashi, K. (2001). Amino acid supplementation affects hematological and biochemical parameters in elite rugby players. Medicine and Science in Sports and Exercise, 33(5), Supplement abstract 932.

This study assessed the effects of 90 days of an amino acid supplement (L-leucine 540 mg, L-isoleucine 610 mg,L-valine 360 mg, L-glutamine 650 mg, L-arginine 610 mg) on training responses of rugby players (N = 23). The supplement was consumed twice daily. Additional assessments were made one year before and one year after supplementation. The absence of a control group makes the findings of this study tentative at best.

After supplementation, Ss' vigor and recovery was reported as improved. Blood transportation factors (Hb, Hct, RBC, and serum iron), total cholesterol, and low density lipoproteins, improved significantly. All values reverted to original levels one year after the program.

Implication. An amino-acid mix might have some beneficial effects on blood parameters and feelings of well-being.

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