The Hong Kong Journal of Sports Medicine and Sports

Volume XI, Nov, 2000

Effects of Tu-chung Extract on Serum Testosterone During Exercise Training in Normoxia and Hypobaric Hypoxia in Rats

Institute of Health and Sport Sciences, University of Tsukuba, Japan

National Space Development Agency of Japan, Tsukuba Space Center, Japan

The purpose of this study was to investigate the effects of administering Tu-Chung extract on serum testosterone (T) during strenuous endurance training during normoxia and hypobaric hypoxia. Male rats swam with loads of 3.5% (normoxia) or 2.63% (simulated altitude of 4,000 m) body weights for 90 min, 6 days per week for 5 weeks. The concentrated Tu-Chung extract was orally administered in the training groups at a dose of 0.7 ml/100 g body weight 1 hr before exercise daily. Distilled water was given by a similar method to other sedentary and control groups. Serum T were measured at rest and following exercise after 5 weeks training. We found that serum T concentrations decreased immediately after exercises in all the training groups, and recovered to the normal level with the treatment of Tu-Chung extract 24 hr after exercise in normoxia, not in hypobaric hypoxia.

Key Words : testosterone, Tu-Chung extract, normoxia. hypobaric hypoxia, exercise training

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