Intermittent hypoxia improves endurance performance and submaximal exercise efficiency

被引:102
作者
Katayama, K
Matsuo, H
Ishida, K
Mori, S
Miyamura, M
机构
[1] Nagoya Univ, Res Ctr Hlth Phys Fitness & Sports, Nagoya, Aichi, Japan
[2] Nagoya Univ, Environm Med Res Inst, Space Med Res Ctr, Nagoya, Aichi 464, Japan
关键词
oxygen uptake; altitude; distance running; intermittent hypoxia; cardiorespiratory adaptation; red blood cells; SEA-LEVEL PERFORMANCE; FORMER SOVIET-UNION; HIGH-TRAINING LOW; HYPOBARIC HYPOXIA; ALTITUDE ACCLIMATIZATION; VENTILATORY RESPONSE; NORMOBARIC HYPOXIA; CYCLING EFFICIENCY; RUNNING ECONOMY; SKELETAL-MUSCLE;
D O I
10.1089/152702903769192250
中图分类号
Q6 [生物物理学];
学科分类号
071011 ;
摘要
The purpose of the present study was to elucidate the influence of intermittent hypobaric hypoxia at rest on endurance performance and cardiorespiratory and hematological adaptations in trained endurance athletes. Twelve trained male endurance runners were assigned to either a hypoxic group (n = 6) or a control group (n = 6). The subjects in the hypoxic group were exposed to a simulated altitude of 4500 m for 90 min, three times a week for 3 weeks. The measurements of 3000 m running time, running time to exhaustion, and cardiorespiratory parameters during maximal exercise test and resting hematological status were performed before (Pre) and after 3 weeks of intermittent hypoxic exposure (Post). These measurements were repeated after the cessation of intermittent hypoxia for 3 weeks (Re). In the control group, the same parameters were determined at Pre, Post, and Re for the subjects not exposed to intermittent hypoxia. The athletes in both groups continued their normal training together at sea level throughout the experiment. In the hypoxic group, the 3000 m running time and running time to exhaustion during maximal exercise test improved. Neither cardiorespiratory parameters to maximal exercise nor resting hematological parameters were changed in either group at Post, whereas oxygen uptake ((V) over dot O-2) during submaximal exercise decreased significantly in the hypoxic group. After cessation of intermittent hypoxia for 3 weeks, the improved 3000 m running time and running time to exhaustion tended to decline, and the decreased (V) over dot O-2 during submaximal exercise returned to Pre level. These results suggest that intermittent hypoxia at rest could improve endurance performance and submaximal exercise efficiency at sea level in trained endurance athletes, but these improvements are not maintained after the cessation of intermittent hypoxia for 3 weeks.
引用
收藏
页码:291 / 304
页数:14
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