The Effect Of Blood Flow Restriction Of Different Pressures Combined With Low-intensity Aerobic Exercise On The Cardiopulmonary Function Of Young Men

Objective:With the development of social economy,the younger generation's lifestyle tends to be electronic and the physical activity is correspondingly reduced,which leads to a decrease in cardiopulmonary function and a decline in physical health.Good cardiopulmonary function helps maintain physical activity and reduces the incidence of cardiovascular and respiratory diseases.We need to explore efficient and safe exercise methods to maintain good cardiopulmonary function for young people who lack regular exercise.Blood flow restriction training is a training method that restricts the local blood flow of the limbs while combining low-intensity exercise.The pressure of blood flow restriction is an important factor that can affect the training effect.However,the effect of blood flow restriction training(BFRT)under different pressures has not been further studied.To this end,this study selected 120 mmHg and180mmHg pressure blood flow restrictions combined with low-intensity aerobic exercise to explore its effect on improving young men's cardiopulmonary function and the effects of different pressure blood flow restrictions on young men's cardiopulmonary function.The exercise prescription combined with low-intensity aerobic exercise provides experimental and theoretical basis.Method:In this study,36 male non-sports major male college students of Tianjin University of Sport were selected in 2017.The subjects had no special training experience.The subjects were randomly divided into three groups: a blood flow restriction of 180 mmHg combined with low-intensity aerobic exercise group(referred to as H-BFR group);a blood flow restriction of 120 mmHg combined with low-intensity aerobic exercise group(referred to as L-BFR group)and low-intensity aerobic exercise group without blood flow restriction(referred to as the CON group).There were 12 subjects each group.During the experiment,the subjects would not participate in other physical activities.Subjects performed jogging on the track and field.The exercise intensity ranged from 30% to 45% of the heart rate reserveintensity.Each exercise lasted 30 minutes,3 times a week for 12 weeks.By analyzing and comparing the changes of various cardiopulmonary function indexes before and after training,the effects of different pressure blood flow restrictions combined with low-intensity aerobic exercise on cardiopulmonary function were clarified.Result:1.Changes in subject weight,BMI,and vital capacity before and after 12 weeks of training Compared with the values before training,after 12 weeks of training,subjects in the H-BFR group,L-BFR group,and CON group had significantly reduced in body weight and BMI(P<0.01),the vital capacity increased significantly in all group(P<0.01,P<0.01,P<0.05);And the vital capacity of H-BFR group and L-BFR group was significantly higher than the CON group(P<0.05);there was no significant difference in body weight,BMI,and vital capacity of H-BFR group and L-BFR group(P>0.05).2.Changes in subjects' quiet heart rate and blood pressure before and after 12 weeks of training Compared with the values before training,there were no significant differences in resting heart rate,systolic blood pressure and diastolic blood pressure in all groups of subjects after 12 weeks of training(P>0.05).3.Changes in subjects' cardiac function indexes before and after 12 weeks of training Compared with the values before training,the stroke volume and ejection fraction of subjects in the H-BFR group and L-BFR group were significantly increased after 12 weeks of training(P<0.05,P<0.01),and significantly higher than those in the CON group(P < 0.01);There was no significant difference in stroke volume,cardiac output,and ejection fraction between the H-BFR group and the L-BFR group(P> 0.05).4.Changes in aerobic capacity of subjects before and after 12 weeks of training Compared with the values before training,the subjects' maximum oxygen uptake,relative oxygen uptake,oxygen pulse,and METS were significantly increased in the H-BFR and L-BFR groups after 12 weeks of training(P<0.01,P<0.05),and Significantly higher than the CON group(P<0.01);there was no significant differencein maximum oxygen uptake,relative oxygen uptake,oxygen pulse,and METS between the H-BFR group and the L-BFR group(P> 0.05).Conclusion:1.12 weeks of 120 mmHg pressure and 180 mmHg pressure blood flow restriction combined with low-intensity aerobic exercise can effectively improve the cardiopulmonary function of young men.2.At 12 weeks,the blood flow limitation of 120 mmHg and 180 mmHg pressure combined with low-intensity aerobic exercise has no significant effect on improving cardiopulmonary function.In order to improve the subject's comfort,the lower pressure(120mmHg)recommended BFRT exercise prescription.