摘要
目的:通过近红外光谱测定技术(NIRS)测定肌肉递增负荷工作时肌氧含量的变化特征,分析肌氧拐点与无氧阈拐点产生的机制及在测定最大有氧能力中的作用,从而找到一个新的评价运动水平的指标。方法:受试者20名按照逐级增负荷(Bruce测试)在功率自行车上蹬车,测潮气量(VT)、摄氧量(VO_(2))、最大摄氧量和心率(HR),同时检测股四头肌外侧从静息状态下到结束运动后整个肌肉组织氧含量变化的过程。结果:研究发现运动强度递增时,肌氧含量呈梯度递降,肌氧下降时出现拐点与乳酸阈、通气阈拐点基本一致。受试者肌肉组织中氧合血红蛋白(HbO_(2))与其VT、VO_(2)、HR间相对变化呈现出高度的相关性(P<0.05)。结论:研究表明在递增负荷运动时,应用NIRS测定动态肌肉工作中肌氧含量变化具有较高敏感性,且肌氧拐点与通气无氧阈和乳酸阈在时间和强度上相一致。
Objective:to determine the change characteristics of muscle oxygen content during muscle incremental load work by near infrared spectroscopy(NIRS),analyze the mechanism of muscle oxygen inflection point and anaerobic threshold inflection point and their role in determining maximum aerobic capacity,so as to find a new index to evaluate exercise level.Methods:Twenty subjects pedaled on a power bicycle according to the step-by-step load increase(Bruce test),and measured tidal volume(VT),oxygen uptake(VO_(2)),maximum oxygen uptake and heart rate(HR)At the same time,the change of oxygen content in the whole muscle tissue from the resting state to the end of exercise was detected.Results:it was found that when the exercise intensity increased,the muscle oxygen content decreased gradually,and the inflection point of muscle oxygen decreased was basically the same as that of lactate threshold and ventilation threshold.Oxygenated hemoglobin(HBO_(2))in the muscle tissue of the subjects Conclusion:the study shows that the change of muscle oxygen content measured by NIRS during dynamic muscle work is highly sensitive to exercise intensity,and the inflection point of muscle oxygen is consistent with ventilation anaerobic threshold and lactate threshold in time and intensity.
作者
余健凡
YU Jian-fan(Physical Education and Sports School of Soochow University,Suzhou 215000,China)
出处
《吉林体育学院学报》
2021年第6期75-80,共6页
Journal of Jilin Sport University
关键词
氧合血红蛋白
最大摄氧量
近红外光谱技术
心率
气体交换率
oxygenated hemoglobin
maximum oxygen uptake
near infrared spectroscopy
heart rate
gas exchange rate
