Effects of acute hypoxia on anaerobic work capacity

• Main Authors: Yu-Ming Tsai, 蔡玉敏
• Other Authors: Johnson Hwang
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/04329971516185369177

碩士 === 國立體育學院 === 教練研究所 === 91 === The present study was undertaken to investigate the effects of acute hypoxia on human anaerobic capacity. Thirty-two physically healthy males volunteered to participate this study. They were assigned into two groups for testing work power of arms (N = 22) and legs (N = 10) at sea level and at 18,000 feet. A bicycle ergometer (Monark) was used to conduct the Wingate anaerobic power test in normoxic and hypoxic conditions. Every 5 seconds work powers were recorded by the computer, which were computed as maximum, minum, average powers and power drop at the end of test. Blood oxygen saturation and heart rate were measured using oximeter at the 20th seconds right after the maximal exercise. Blood sample was collected at the 3rd min of recovery period for analyzing lactate level. Oxygen equipment is available all the time for preventing subjects from hypoxic incidents. Maximum and average powers were significant decrease in arms during acute hypoxia exposure. A lower lactate level was showed after the exhausted arm exercise in hypoxic condition, which might be linked to vasodilation response, or lower anaerobic power output in hypoxia. It is suggested that those who perform heavy work in the moderate altitude should be equipped with oxygen apparatus and aware of the hypoxic syndromes exacerbated by physical activity. Besides, good physical fitness will improve the anaerobic capacity in hypoxia, especially the anaerobic capacity of upper limbs.