Effect Of Blood Flow Restricted Dynamic Stretching On Lower Limb Flexibility And Explosive Force Of Swimming Students

KAATSU training,also known as blood flow restriction training,refers to the method of training by applying pressure to the limbs during exercise through professional pressure facilities,blocking the blood flow of the vein and blocking part of the arterial blood flow at the same time.Pressure training has been proved to be able to achieve the similar training effect of high-intensity training with less exercise intensity,while dynamic stretching is a kind of exercise method that uses the body’s self weight to train,which can effectively improve the flexibility and explosive force of the body.In the process of dynamic stretching,it is necessary to carry out experimental research on the impact of pressure intervention on the lower limbs.Experimental purpose: in the dynamic stretching training,the thigh muscles of the lower limbs are pressurized.Combined with the characteristics of the compression training and dynamic stretching training,the effects of dynamic stretching on the flexibility and explosive force of the limbs,and on the swimming performance based on this,as well as the degree of its influence are explored.Experimental method: 14 swimming students of Beijing Sport University were randomly divided into two groups: experimental group and control group.The experimental group received pressure intervention during dynamic stretching training(the training pressure was 200mmhg),while the control group only received dynamic stretching training.The experiment lasted for 8 weeks,before,after and during the experiment(After 4 weeks’ experiment and 8 weeks’ experiment,the indexes of knee joint activity,standing jump,standing long jump and 50 m freestyle were measured,and the experimental data were obtained.Conclusion: dynamic stretching under pressure can significantly improve the flexibility of the lower limbs immediately after stretching,but reduce the explosive force of the lower limbs;while dynamic stretching alone can significantly improve the explosive force of the lower limbs,and the flexibility of the lower limbs also has a certain degree of improvement.After 8 weeks of training,dynamic compression stretching can significantly improve the flexibility and explosive force of the lower limbs,but the increase range slows down with the increase of time;while dynamic alone stretching can increase the flexibility and explosive force of the lower limbs to a certain extent.After 8 weeks of training,compared with dynamic stretching alone,dynamic stretching under pressure can improve the flexibility and explosive force of lower limbs more significantly.In terms of swimming performance,both dynamic stretching and dynamic stretching alone can improve swimming performance to a certain extent,and dynamic stretching can improve swimming performance more significantly,but they are not statistically significant.