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Fry, A.C., Kraemer, W.J., Stone, M.H., Warren, B.J., Kearney, J.T., Maresh, C.M., Weseman, C.A. and Fleck SJ. (1993) Endocrine and performance responses to high volume training and amino acid supplementation in elite junior weightlifters. International Journal of Sport Nutrition, 3, 306-322.

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• TITLE: The effect of L-ornithine hydrochloride ingestion on human growth hormone secretion after strength training

  AUTHORS: Shinichi Demura, Takayoshi Yamada, Shunsuke Yamaji, Miho Komatsu, Koji Morishita

  KEYWORDS: L-Ornithine Hydrochloride; Growth Hormone; Strength Training

  JOURNAL NAME: Advances in Bioscience and Biotechnology, Vol.1 No.1, April 22, 2010

  ABSTRACT: This study aimed to examine the effect of L-ornithine hydrochloride ingestion on serum growth hormone secretion response after strength training in young men who did not regularly engage in high intensity exercise. Ten healthy young males without workout habits (age: 22.2 +/- 1.0 yr). Subjects performed biceps curl strength training after L-ornithine hydro- chloride and placebo ingestions. They participated in both of the above conditions randomly with a week interval in between. Serum growth hormone and ornithine levels were measured before L-ornithine hydrochloride or placebo ingestions and at 30 minutes after strength training. Serum growth hormone and ornithine level were measured. A change magnitude of serum growth hormone was significantly larger in the L-ornithine hydrochloride condition than in the placebo condition, and the effect size was also large (t = 1.91, p = .044, ES = .75). A significant interaction (F = 280.98, p = 0.000, ηp2 = 0.96) was found in serum ornithine and a multiple comparison test showed that it was greater in the L-ornithine hydrochloride condition. Serum growth hormone level after strength training increases by L-ornithine hydrochloride ingestion in untrained young males.