恒功率运动性疲劳的生理生化指标

Characteristic study on physiological and biochemical indexes of isopower cycling-induced fatigue

比较恒功率不同阻力下运动性疲劳的生理、生化特点,探寻恒功率不同阻力下运动性疲劳的发生和恢复规律。选取15名健康男生,用功率自行车进行5次300 W恒功率运动测试,每次测试采用不同运动阻力,运动后即刻记录运动时间,测试心率、血压、血红蛋白(Hb)、血尿素(BU)以及血液肌酸激酶(CK),次日晨再次测试Hb、BU、CK。结果表明:在预定功率的恒功率运动中,阻力过低或过大都不利于延长运动时间,适宜的阻力才可以维持较长的运动时间;工作肌收缩频率增加易导致心率增加和血红蛋白损伤,工作肌收缩阻力增加易导致血压升高和BU、CK恢复减慢。

To analyze physiological and biochemical character after isopower cycling, and to look for the law of emergency and recovery of isopower cycling-induced fatigue. Methods： 15 male students were subjected to 5 cycling tests with isopower 300W and different resistance. Duration, heart rate and blood pressure were documented immediately after every test, hemoglobin （Hb）, bloody urine （BU） and creatine kinase （CK） were detected immedi- ately after exercise and the next morning. Results and conclusion： In emergency and recovery of isopower cycling-induced fatigue, the contractive frequency of working muscle is in contrast to the contractive force. The increase of contractive frequency of working muscle is prone to induce increase in heart rate and injury of hemoglobin, the increase of contractive force of working muscle is prone to induce increase in blood pressure and delay of BU and CK recovery.