Effect of pre-acclimatization training under hypoxic environment for one week on work capacity and physiological responses under hypoxic environment
10.7600/jspfsm.63.213
- VernacularTitle:1週間の低酸素環境下での事前順化トレーニングが低酸素環境における運動能力および生理応答に及ぼす影響
- Author:
Dai Okushima
;
Masayoshi Yamamoto
- Publication Type:Journal Article
- Keywords:
normobaric hypoxia;
lactate threshold;
arterial oxygen saturation;
sympathetic activity
- From:Japanese Journal of Physical Fitness and Sports Medicine
2014;63(1):213-222
- CountryJapan
- Language:English
-
Abstract:
We examined the effect of pre-acclimatization training under hypoxia for competition or training at high altitude on work capacity and physiological responses in hypoxia. Eight healthy male university students performed pre-acclimatization training under normobaric hypoxia (equivalent to about 2500 m; 15.4% inspired oxygen) for a week. Each student was exposed for a total of 90 minutes. During the exposure, each student rested for 60 minutes and pedaled at a workload of lactate threshold (LT) under normobaric hypoxia (equivalent to about 2500 m) for 30 minutes. In the result, workload of LT under normobaric hypoxia significantly increased after pre-acclimatization training (+15%). In physiological responses, arterial oxygen saturation at rest and exercise and peak ventilatory volume significantly increased after pre-acclimatization training. Arterial oxygen saturation at rest during pre-acclimatization training significantly increased. In addition, the ratio of low- and high-frequency power in heart rate variability significantly decreased after pre-acclimatization training. These results suggest that pre-acclimatization training is able to bring in acclimatization to high altitude on cardiopulmonary function and prevent decline of work capacity in high altitude. The ratio of low- and high-frequency power in heart rate variability as well as arterial oxygen saturation may reflect degree of acclimatization to high altitude.
