The Effects of Sports Drink Osmolality on Fluid Intake and Immunoendocrine Responses to Cycling in Hot Conditions

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概要

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• We investigated the effects of two carbohydrate-based sports drinks on fluid intake and immunoendocrine responses to cycling. Six well-trained male cyclists completed trials on three separate days that involved cycling at 60% VO2peak for 90 min in hot conditions (28.1±1.5ºC and 52.6±3.1% relative humidity). During each trial, the subjects consumed ad libitum (1) an isotonic sports drink (osmolality 317 mOsm/kg), (2) a hypotonic sports drink (osmolality 193 mOsm/kg) or (3) plain water. The cyclists consumed significantly (p<0.05) more of the isotonic drink (1.23±0.35 L) and hypotonic drink (1.44±0.55 L) compared with water (0.73±0.26 L). Compared with water (−0.96±0.26 kg), body mass decreased significantly less after consuming the hypotonic drink (−0.50±0.38 kg) but not the isotonic drink (−0.51±0.41 kg). Blood glucose concentration was significantly higher at the end of the isotonic and hypotonic drink trials compared with the water trial. Neutrophil count and the plasma concentrations of catecholamines, interleukin 6 (IL-6), myeloperoxidase, calprotectin and myoglobin increased significantly during all three trials. IL-6 and calprotectin were significantly lower following the hypotonic drink trial compared with the water trial. In conclusion, hypotonic sports drinks are appealing for athletes to drink during exercise, and may help to offset fluid losses and attenuate some inflammatory responses to exercise.

著者

• MURAOKA Isao

  Faculty of Sport Sciences, Waseda University

• Higuchi Mitsuru

  Faculty Of Sport Sciences Waseda University

• Muraoka Isao

  Faculty Of Sport Sciences Waseda University

• Sakamoto Shizuo

  Faculty Of Physical Education International Budo University

• MITSUDA HIROMICHI

  Beverage Research & Development Laboratory, Asahi Soft Drinks Co., Ltd.

• Suzuki Katsuhiko

  Faculty Of Human Sciences And Consolidated Research Institute For Advanced Science And Medical Care

• ISHIJIMA Toshimichi

  Waseda Sport Sciences Research Center

• HASHIMOTO Hideki

  Beverage Research & Development Laboratory, Asahi Soft Drinks Co.

• OH Taewoong

  Graduate School of Health Science, Matsumoto University

• M. PEAKE

  Queensland University of Technology

• HASHIMOTO Hideki

  Beverage Research & Development Laboratory, Asahi Soft Drinks Co.

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