Changes of Muscle Oxygen in Athletes of Different Levels Monitor during Incremental Load Based on Near-infrared Spectroscopy Technique
In order to analyse the variation characteristics of muscle oxygen saturation(SMO2)of different muscles in three key links of increasing load test for athletes of different levels,find out the relationship between the variation of SMO2 of athletes of different levels and the variation of common indicators,so as to improve the pertinence and effectiveness of increasing load test in rowing training monitoring.45 male rowers were divided into three groups according to the results of the 2 000 m rowing ergonometer:A,B and C.Three groups completed the incremental load test respectively,and the changes of muscle oxygen in the left and right biceps brachii,erectus spinus and vastus medialis were recorded throughout the whole process,while the heart rate,blood lactic acid and other indica-tors were recorded.Shapiro-Wilk method was used to test the normality of experimental data,and non-parametric test was used to com-pare the test results of SMO2 changes in different muscles of the same athletes.Two tail independent T test was used to compare the re-sults of incremental load test for athletes of different levels.Pearson correlation analysis was used to analyze the correlation between SMO2 and other indexes in different parts of the same athletes.The results show these as follows.There is A correlation between ΔHR and ΔSMO2 in different parts of group A,B and C.In group A,ΔSMO2 was highly correlated with ΔHR throughout the whole course(r=0.74-0.82,P＜0.01),ΔSMO2 was highly correlated with ΔHR throughout the whole course(r=0.32-0.88,P＜0.01),ΔSMO2 was highly correlated with ΔHR throughout the whole course(r=0.49-0.81,P＜0.01),and ΔSMO2 was high-ly correlated with ΔHR throughout the whole course(r=0.49-0.81,P＜0.01).When the change amplitude of BLA was-4.36 mmol/L,the change amplitude of ΔSMO2 in group B was-18.64％,and that of ΔSMO2 in group C was-9.31％.It is concluded that the SMO2 of athletes of different levels showed a downward trend step by step with the increase of load in the increasing load test of rowing,.However,the variation characteristics of SMO2 in the three key muscles of athletes at different levels showed a certain degree of difference.In the incremental load test of rowing,the comprehensive ΔSMO2 change rate,ΔHR change rate andΔBLA change rate of athletes with high level of rowing skill are relatively small.Athlete SMO2"inflection point"is consistent with"lactate threshold inflection point".Under the same BLA,the SMO2 of athletes with high level changes greatly,while the SMO2of athletes with low level changes little.SMO2 changes only represent local oxidative metabolism and exercise ability,but cannot reflect the overall exercise performance.
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