Effects of oral supplementation with cystine and theanine on immune function of athletes in endurance exercise at a training camp: randomized, double-blind, placebo-controlled trial

Shigeki Murakami, Shigekazu Kurihara, Natsue Koikawa, Akira Nakamura, Kazuhiro Aoki, Hiroshi Yosigi, Keisuke Sawaki, and Masaru Ohtani, Bioscience, Biotechnology, and Biochemistry73(4):817-821(2009.4)

Fifteen long-distance runners were allocated into CT or placebo groups, and test food was ingested for 10 days prior to the start of training camp. Clinical examinations were performed before and after the training camp. The results indicated a significantincrease in high-sensitivity C-reactive protein (hs-CRP) and neutrophil count in blood, as well as a decreasing tendency of lymphocytes in the placebo group, but not the CT group. These observations suggested that ingestion of CT contributes to suppress the changing rate of inflammatory response, prevents decreasing rate of immune function, and prevents infection and reduces symptoms when infected associated with continuous intense exercise.

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