| KAATSU training is a new type of strength training method,which is currently mainly used in competitive sports,sports rehabilitation and medical treatment.It causes muscle ischemia through special compression equipment,stimulates muscles to produce a series of reactions,so as to achieve the effect of promoting muscle growth and improving muscle function with less training intensity.Due to its low training load stimulation,it is favored by many sports.When combined with resistance training,it can significantly improve muscle strength and circumference,etc.,and it has been confirmed by relevant literature.Research purposes: This study explored the effects of different pressures（250mm Hg,300 mm Hg,350 mm Hg）combined with different loads（0percent 1RM,30 percent 1RM,75 percent 1RM）on the EMG signals of the main muscles of the lower limbs,and analyzed the effects of different KAATSU training combinations on the EMG signals.The differences in the EMG signals of lower extremity muscle groups aim to explore the optimal blood flow limiting pressure for muscle adaptation,and provide certain scientific theoretical support for the promotion and application of KAATSU training.Research methods: 16 male college students from the School of Physical Education of North China University were randomly selected as subjects.The squat 1RM test was performed one week before the experiment.In the experiment,three different pressure values of 250 mm Hg,300 mm Hg,and 350 mm Hg were selected,and the squat test of 0percent 1RM,30 percent 1RM,and 75 percent 1RM was carried out respectively.The surface EMG signals were collected by a wireless surface EMG tester,and the root mean square amplitude（RMS）,integral EMG（i EMG）,median frequency（MF）and mean power frequency（MPF）values of lower limb muscle groups were calculated.The data are expressed as mean ± standard deviation,and two-way single-measure variance analysis was used to investigate the activation effect and difference of lower limb muscle groups by applying different pressures and different loads.One-way analysis of variance was used to analyze the compression group and the control group.difference analysis.When p < 0.05,the difference was significant;p < 0.01,the difference was very significant.Research results:（1）After two-factor（pressure × load）analysis of variance statistics,the results show that the load has a very significant effect on the root mean square amplitude of the muscle（p< 0.01）,and the compression intensity and load have a significant effect on the root mean square of the rectus femoris.The interaction of amplitude has a significant effect（p< 0.05）;the compression intensity has a significant effect on the rectus femoris integral EMG（p< 0.05）,and has a very significant effect on the vastus lateralis integral EMG（p<0.01）,the load had a very significant effect on the integral EMG of the vastus lateralis,biceps femoris and gastrocnemius（p< 0.01）;the compression intensity had a significant effect on the median frequency of the biceps femoris（p< 0.05）,The loading volume had a significant effect on the median frequency of the vastus medialis muscle（p< 0.05）,and the interaction between compression intensity and loading volume had a significant effect on the median frequency of the rectus femoris muscle（p< 0.05）;Muscle,vastus lateralis,vastus medialis and gastrocnemius had a very significant effect on the average power frequency（p< 0.01）;（2）Under the three compression pressures,the activation degree of the anterior thigh muscle group was significantly improved when the load was 30 percent 1RM,and the activation degrees of all muscles were significantly increased when the load was 75 percent 1RM compared with 0percent 1RM,and the activation degree of rectus femoris,vastus lateralis and vastus medialis was significantly higher than 30 percent 1RM;the force of the anterior thigh muscle group increased to varying degrees with the change of load,when the load reached30 percent 1RM,the increase was significant,and the thigh When the load was 75percent1 RM,the degree of exertion of the posterior muscle group and the posterior calf muscle group was significantly higher than that of 0percent 1RM;the fatigue degree of all muscles increased with the increase of the load,and the fatigue degree of the posterior thigh muscle group was significantly higher than the load of 0percent 1RM.At 30 percent 1RM,the increase was significant,and the fatigue degree of the anterior thigh muscles was significantly higher than that at 30 percent 1RM when the load was 75 percent 1RM;all muscle work degrees increased with the increase of the load,and the trend was obvious.Anterior and posterior calf muscle work increases significantly at a load of 30 percent 1RM.Research conclusion: Moderate compression intensity,that is,in the pressure range of250 mm Hg to 300 mm Hg,can produce better training effect.The effect of KAATSU training on the EMG signal is more significant.In strength training,more muscle fibers and motor units can be recruited to participate in the exercise,which makes it easier to produce fatigue,which can effectively improve the training efficiency and produce better training effects. |
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