Effects Of High Intensity Intermittent Exercise And Moderate Intensity Continuous Exercise On Vascular Elasticity

Research purposes:To study the effects of an acute high intensity intermittent exercise and moderate intensity continuous exercise on the arterial vascular elasticity of the body,and to compare the effects of the two modes of exercise on the elasticity of the body's arteries.Research methods:The subjects of this study were 30 male college students,which were divided into high intensity intermittent exercise(HIIT)group(15 persons)and moderate intensity continuous exercise(MICT)group(15 persons)by cross-grouping.And they were divided into two-stage 5km treadmill exercise.The HIIT group took90% VO2 max intensity for 4 minutes of high intensity interval training treadmill exercise,and an active recovery mode to REP 13 as interval.The MICT Group continued to complete 5 km treadmill exercise with 55% VO2 max intensity.The effect of the first-stage experiment was eliminated by a one-week interval between the two phases of the experiment.The vessel elasticity,blood pressure,heart rate and other indicators of the subjects before each exercise,immediately after exercise,15 minutes after exercise,30 minutes after exercise,and 60 minutes after exercise were measured.The data was processed using SPSS 21.0.The changes of vascular elasticity,blood pressure and heart rate of the two modes before and after treadmill exercise were analyzed and discussed.The effects of the two methods on the blood vessels were compared.Research results:(1)Changes of heart rate before and after exerciseAfter the 5 km treadmill exercise,the heart rates of HIIT and MICT increased significantly,then gradually recovered,but did not return to the pre-exercise level 60 minutes after exercise.The heart rate immediately after exercise,15 minutes after exercise,30 minutes after exercise and 60 minutes after exercise were higher than the pre-exercise level(BL)(P < 0.001),and the heart rate at the time point after recovery was lower than that at the time point before exercise(P < 0.01).From the comparison of heart rate between HIIT and MICT before and after cross-exercise,the heart rate of HIIT group after exercise was higher than that of MICT group,but the difference of independent sample T test results was not significant(P>0.05).HIIT and MICT were performed before and after the crossover,and paired tests were performed on the relevant indicators of HIIT and MICT in 30 subjects.It was found that there were significant differences in heart rate immediately after exercise,15 minutes after exercise and 30 minutes after exercise.HIIT was significantly higher than MICT(P<0.05),and there was no significant difference until 60 minutes after exercise.(2)Changes of blood pressure after exerciseThere was no significant effect of diastolic blood pressure on both modes of exercise,and at each time point after exercise(in HIIT or MICT),there was no significant difference in diastolic blood pressure and BL value(P > 0.05).The two modes of exercise had a significant effect on the systolic blood pressure of the body.Immediately after the end of exercise,HIIT showed a significant decrease in systolic blood pressure.The systolic blood pressure after exercise,15 minutes,30 minutes and60 minutes after exercise was lower than that of BL(P < 0.05).The systolic blood pressure of MICT decreased immediately after exercise,15 minutes,30 minutes and60 minutes after exercise(P < 0.05).Immediately after the end of exercise,the systolic blood pressure of MICT showed a downward trend.The systolic blood pressure of 15 minutes,30 minutes and 60 minutes after exercise was lower than that of BL(P < 0.05).From the comparison of HIIT and MICT,there was no difference in systolic and diastolic blood pressure between the two groups before and after exercise,15 minutes after exercise,30 minutes after exercise and 60 minutes after exercise(P >0.05).(3)Changes of vascular elasticity before and after exerciseImmediately after the HIIT exercise,the cardio-ankle vascular index(CAVI)decreased significantly,which was significantly different from the BL value(P <0.001).At the same time,the CAVI value gradually increased with the increase of rest time.Although the CAVI value increased at 15 minutes after recovery(P < 0.05),it was still lower than the BL value(P < 0.001).The CAVI value at 30 minutes after recovery was higher than that at 15 minutes after recovery(P < 0.05),but still lower than the BL value(P < 0.05).There was no statistical difference between the CAVI value and the Bbefore and L value at 60 minutes after recovery(P > 0.05),but the mean value was still lower than the basic value.The changes of CAVI and BL values after MICT exercise were basically consistent with those of HIIT group.From the comparison of HIIT and MICT,there was no significant difference in CAVI between the two methods before and after exercise,15 minutes after exercise,30 minutes after exercise and 60 minutes after exercise(P > 0.05).Research conclusions:(1)An acute 5 km high intensity intermittent aerobic exercise and moderate intensity continuous aerobic exercise can significantly reduce systolic blood pressure,and maintain for more than an hour,but the improvement of diastolic blood pressure is not obvious.(2)An acute 5 km high intensity intermittent aerobic exercise and moderate intensity continuous aerobic exercise can improve vascular elasticity and maintain for at least 30 minutes.(3)No significant difference was found between high intensity intermittent aerobic exercise and moderate intensity continuous aerobic exercise in the improvement of blood pressure and vascular elasticity.