Study On The Changes Of Electromyography And Muscle Oxygen During Incremental Load Exercise Under Different Blood Flow Restriction Levels

Objective: To compare the characteristics of electromyography and muscle oxygen changes in lower limb muscle groups under increasing load exercise at 0% AOP(arterial occlusive pressure),30% AOP,50%AOP and 70% AOP,and to explore the correlation between EMG,muscle oxygen,heart rate(HR),blood lactic acid(Bla),subjective physical sensation(RPE)and other indicators of increasing load exercise at 0%AOP,30% AOP,50% AOP and 70% AOP levels,and enrich training indicators.Provides practical research for the application of incremental load testing in training.Research Methods: This study adopts literature method,experimental method and mathematical statistical method.A total of 16 male college students(average age: 21.24±2.45 years,average height: 174.45±3.24 cm,average weight: 68.36±4.76 kg,average training years: 2.23±1.21 years)were selected to participate in this study.All subjects participated in the incremental load exercise test of power bicycles at 0% AOP,30% AOP,50% AOP and 70% AOP levels,with an interval of 48 hours between each test,and the incremental load test set the starting power of 80 W,each stage in 30 W increments,and each stage continued to exercise for 3 minutes until exhaustion was considered the end of the test.The whole process collects IEMG,muscle oxygen,RPE,HR,Bla and other index data.All data in this study were expressed as mean ± standard deviation,SPSS20.0 software was used for statistical analysis,two-way repeated measurement ANOVA was used for EMG and myooxygen data,and Pearson correlation analysis was used for the correlation between IEMG and muscle oxygen and HR,Bla and RPE.Research results:1.The main effect of increasing load exercise lower limb IEMG at 0% AOP,30% AOP,50% AOP and 70% AOP level was very significant(F=7.10～20.87,P<0.01),and there were significant differences between the first level and the previous level(P<0.05)after the IEMG values of increasing load exercise lower limbs at 0% AOP,30% AOP,50% AOP and70% AOP levels,and there were also significant differences between all levels and the first level(P<0.05).The comparison results of the mean IEMG values of lower limb muscles showed that the lower limb IEMG values of 50% AOP were greater than those of other AOP levels.The interaction with different AOP levels in increasing load levels is correspondingly insignificant.2.The main effect of lower limb muscle oxidation in subjects with increasing load exercise at 0% AOP level was significant(F=23.65,P<0.05),and the main effect of lower limb muscle oxidation in subjects with increasing load exercise at 30% AOP,50% AOP and 70%AOP level was not significant(P>0.05).On average,the lower limb muscle oxygen value of the subjects showed 0% AOP> 30% AOP> 50%AOP > 70% AOP.3.From the perspective of increasing load level,there was no correlation between the IEMG value of the lower extremity and HR,Bla and RPE at the levels of 0% AOP,30% AOP,50% AOP and 70% AOP(p>0.05),and the overall lower limb IEMG value of the increasing load exercise was significantly correlated with HR,Bla and RPE at different AOP levels(r=0.940～0.999,p<0.05),and the lower limb IEMG and HR,The correlation coefficient comparison results of Bla and RPE show that the correlation coefficient of 50% AOP is greater than that of other AOP levels.4.From the perspective of increasing load levels,there was no correlation between muscle oxygen and HR,Bla and RPE at 0% AOP,30%AOP,50% AOP and 70% AOP levels(p>0.05),and in the overall view of increasing load exercise,muscle oxygen and HR,Bla,RPE at 0% AOP,30% AOP,50% AOP and 70% AOP levels were significantly correlated(r=-0.801～-1.000,p).<0.05),the correlation coefficients of muscle oxygen with HR,Bla and RPE at different AOP levels showed that the correlation coefficients of 70% AOP were greater than those of other AOP levels.5.From the perspective of increasing load level,there is no significant correlation between lower limb IEMG and muscle oxygen at 0% AOP,30% AOP,50% AOP and 70% AOP levels(p>0.05),and the correlation coefficient of lower limb IEMG and muscle oxygen at different AOP levels shows that the correlation coefficient of 50% AOP is greater than that of other AOP levels.Conclusion:1.As the level of exercise increases,the subjects’ IEMG shows an upward trend,while muscle oxygen shows a stepwise downward trend,with a significant negative correlation between IEMG and muscle oxygen.Under different levels of blood flow restriction,lower limb muscle IEMG has the highest number of recruited muscle fibers at 50% AOPA level,not that the higher the blood flow restriction level,the stronger the stimulation to muscle IEMG;The lower limb muscle oxygen has the lowest muscle oxygen value at 70% AOP level,and the higher the blood flow restriction level,the lower the muscle oxygen content.The combination of the two uses rich testing indicators.2.IEMG is significantly positively correlated with HR,Bla,and RPE,and the correlation coefficients at the 50% AOP level are greater than those at other levels.It can be concluded that muscle activation is high at the50% AOP level;Muscle oxygen is significantly negatively correlated with HR,Bla,and RPE,and the correlation coefficients at the 70% AOP level are greater than those at other levels.It can be seen that the 70% AOP level has the greatest impact on muscle oxygen.3.There is a certain correlation between the correlation coefficient between lower limb muscle group IEMG and muscle oxygen under different levels of blood flow restriction.The comparison of correlation coefficients between lower limb muscle group IEMG and muscle oxygen under different levels of blood flow restriction is: 50% AOP>30% AOP>70AOP>0% AOP.The strongest correlation between IEMG and muscle oxygen was observed at a 50% AOP level.It can be seen that the50% AOP level has a good effect on the training of incremental load exercise testing,and can achieve the training effect,enriching the training methods of incremental load exercise.