The present study determined metabolic and performance responses to repeated sprint exercise under hypoxia among female team-sport athletes. Fifteen female athletes (age, 20.7±0.2 years; height, 159.6±1.7 cm; body weight, 55.3±1.4 kg) performed two exercise trials under either a hypoxic [HYPO; fraction of inspired oxygen (F i O 2 ), 14.5%] or normoxic (NOR; F i O 2 , 20.9%) condition. The exercise consisted of two sets of 8×6-s maximal sprint (pedaling). The average power output was not significantly different between trials for set 1 ( P =0.89), but tended to be higher in the NOR trial for set 2 ( P =0.05). The post-exercise blood lactate concentrations were significantly higher in the HYPO trial than that in the NOR trial ( P <0.05). Exercise significantly increased serum growth hormone (GH) and cortisol concentrations ( P<0.01 for both hormones), with no difference between the trials. In conclusion, repeated short-duration sprints interspaced with 30-s recovery periods in moderate hypoxia caused further increase in blood lactate compared with the same exercise under normoxic conditions among female team-sport athletes. However, exercise-induced GH and cortisol elevations or power output during exercise were not markedly different regardless of the different levels of inspired oxygen.
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机译：本研究确定了低氧运动对女队体育运动员反复冲刺运动的代谢和性能反应。 15名女运动员（年龄20.7±0.2岁；身高159.6±1.7 cm；体重55.3±1.4 kg）在低氧[HYPO;氧气（F i O 2）的比例为14.5％]或常氧（NOR; F i O 2，20.9％）条件。练习包括两组8×6-s最大冲刺（踩踏板）。组1的试验之间的平均功率输出无显着差异（P = 0.89），但组2的NOR试验中的平均功率输出往往更高（P = 0.05）。 HYPO试验的运动后血乳酸浓度显着高于NOR试验（P <0.05）。运动显着增加血清生长激素（GH）和皮质醇浓度（P两种激素均<0.01），试验之间无差异。总的来说，与低氧条件下的女团体运动运动员进行的相同运动相比，中度低氧时反复的短时冲刺与恢复期间隔30-s导致血液乳酸进一步增加。但是，运动引起的GH和皮质醇升高或运动过程中的功率输出无显着差异，无论吸入的氧气水平如何。
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