摘要
应用近红外光谱技术(NIRS)测定肌肉递增强度工作时肌氧含量变化与最大摄氧量和无氧阈指标之间的关系;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。方法:受试者17名按运动水平分为A、B两组在功率自行车上以逐级递增负荷蹬车,测定右股外侧肌肌氧含量并同步测量VE、VCO2、VO2、HR,并在每级负荷末测定血乳酸。结果:研究发现递增负荷运动时肌氧含量呈台阶状下降,负荷较低时,肌氧在负荷开始阶段迅速下降之后保持平衡或升高,负荷较高时肌氧持续下降,肌氧的变化与血容量相吻合。肌氧含量与摄氧量、心率及血乳酸等值高度相关(P<0.01)。肌氧下降时出现拐点与乳酸阈、通气阈拐点基本一致。结论:研究表明NIRS测定动态肌肉收缩时肌氧含量变化对运动强度具有较高敏感性;肌氧拐点与通气无氧阈、心率无氧阈、乳酸阈在时间和强度上相一致,表明肌氧含量的测定可以用于人体最大有氧能力的评定。
The purpose of this study was to observe the changes in skeletal muscle ogygenation at different incremental exercise on bicycle ergometer and to analyze the production mechanism of oxygenation and anaerobic threshold turing points and its effects in evaluating maximal aerobic capacity（MAC）.17 participants were divided into two groups（Group A and Group B） according to their athletic career.Incremental exercise was performed on cycle egometer and respired gas was continuously sampled by IMA for breath-by-breath determination of VE,VCO2 and VO2.Blood sample was taken from fingertip for analyzing blood lactate concentration.Moreover,muscle oxygenation from quadricepts muscle was measured simultaneously.The result indicated that at the beginning of exercise,muscle oxygenation immediately declined with greade increase and kept balance gradually when the same grade exercise continued.As the workload was upgraded,the muscle oxygenation sharply declined correspondent to the intensity of the exercise.The change of muscle oxygenation during incremental exercise was correlated with Bla and VO2.It could be concluded that NIRS was a fairly sensitive method for measuring muscle oxygenation during exercise.The turning point of muscle oxygenation which was correspondent with the breaking points of Bla,VT and HR might indicate that NIRS could be effectively utilized for determining MAC.
出处
《武汉体育学院学报》
CSSCI
北大核心
2011年第1期33-39,共7页
Journal of Wuhan Sports University
基金
湖北省教育厅重点科研项目(2003X143)
