Discussion On Acute Effect Of Different Protocols Of Resistance Training With Blood Flow Restriction On Heart And Vessels

Objective:By designing different pressures of blood flow restriction (BFR)and different intensities of resistance training, to study the acute effects of resistance training with blood flow restriction of healthy male college students on heart and vessels, in order to further explore suitable training load of resistance training with blood flow restriction.Methods:72 healthy male college students were randomly divided into 9 groups:1.completely BFR with 0%1RM resistance exercise group (CBFR),2.completely BFR with 30%1RM resistance exercise group (CBFRL),3.completely BFR with 60%1RM anti resistance exercise group (CBFRH),4.partially BFR with 0%1RM resistance exercise group (PBFR),5.partially BFR with 30%1RM resistance exercise group (PBFRL),6.partially BFR with 60%1RM resistance exercise group (PBFRH),7.sedentary control group (CON),8.30%1RM resistance exercise group (RL),9.60%1RM resistance exercise group (RH). Each subjects performed an acute left arm elbow flexion exercise,20 repetitions per set,1-min inter-set rest period, five sets. The blood pressure of the brachial artery (SBP, DBP, MAP)were detected before and immediately after exercise, so did the ultrasonic index, such as heart rate (HR), left atrial diameter at the heart (LAD) and left ventricular diastolic diameter (LVDd), left ventricular systolic diameter (LVDs), interventricular septal thickness (IVSd) and left ventricular posterior wall thickness (LVPWd), left ventricular fractional shortening (LVFS), left ventricular ejection fraction (EF), stroke volume (SV), cardiac output (CO); and the brachial artery blood vessel diameter (BAD), peak systolic velocity (Vs), peak early diastolic reverse flow velocity (Ve), late diastolic blood flow velocity (Va), vascular resistance index(RI), brachial artery blood flow volume (BFV), systemic artery compliance (C) and so on.Results:1.Except that Ve, RI have significant interaction (F value 2.8523, P=0.04, F value 2.8519, P=0.040), there are no significant interaction (P>0.05) on the other indexes; 2.Except that LVDs, LVFS, EF have the significant main effect of the pressure of blood flow restriction (F value 3.5361, P=0.035; F value 6.6548, P=0.002; F value 12.2326, P<0.001), there is no significant main effect on other indicators (P>0.05); 3. There is significant main effect of the intensity of resistance exercise on SBP, DBP, MAP, EF(F value 5.6364, P=0.005; F value 3.2917, P=0.040; F value 5.3340, P=0.000; F value 12.2326, P=0.049) of the heart,and so it is with Vs, Ve, Va, BFV and RI (F value 13.8148, P=0.000, F value 6.9432, P=0.003; F value 17.2935, P=0.000; F value 13.6741, P= 0.000; F value 12.4785, P= 0.000) of the brachial artery.Conclusion:The acute effect of different forms of ischemia resistance exercise on cardiac and vascular function does not have interaction, so the choice of the optimal exercise program still needs further study.