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Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
Online ISSN 1827-1928
BODY COMPOSITION, SPORT NUTRITION AND SUPPLEMENTATION (ergogenics)
Koba T. 1, Hamada K. 1, Sakurai M. 1, Matsumoto K. 1, Hayase H. 1, Imaizumi K. 1, Tsujimoto H. 2, Mitsuzono R. 2
1 Saga Nutraceuticals Research Institute Otsuka Pharmaceutical Co. Ltd., Saga, Japan
2 Institute of Health and Sports Science Kurume University, Fukuoka, Japan
Aim. We investigated the effect of branched-chain amino acids (BCAA) supplementation on tissue damage during distance running.
Methods. Eight male distance runners (mean ± standard deviation; age: 20.4±1.2 years, body weight: 58.4±4.2 kg) participated in a double blinded cross over designed study conducted during training camp. During each intervention period, the subjects were asked to participate in a 25-km run, and the blood BCAA and lactate dehydrogenase (LDH) level, an index of tissue damage, were measured pre- and post-run. Either a drink containing BCAA (0.4% BCAA in a 4% carbohydrate solution) or an iso-calorie placebo drink was provided to the subjects 5 times during the run without any restriction in the volume.
Results. The total volume of the drink consumed by the subjects did not differ substantially between the trials: 591±188 (2.36 g BCAA) vs 516±169 mL in BCAA and placebo trial, respectively. During the run, the blood BCAA concentration was maintained in the BCAA trial. However, the blood BCAA concentration level tended to decrease in the placebo trial (P<0.1). The extent of the blood LDH increase in the BCAA trial was significantly less than that of the placebo trail (48% vs 58%, P<0.05).
Conclusion. Maintaining the blood BCAA level throughout a long distance run contributes to a reduction in the LDH release and, therefore, the effect of BCAA supplementation is suggested to reduce the degree of muscle damage.