| Objective:To explore the different blood flow restriction pressure on lower limb muscle activation and post-activation enhancement effects in female soccer player,and determines the best personal blood pressure limit inducing muscle activation and post-activation enhancement effect through comparative analysis of muscle activation and post-activation enhancement effects induced by different limiting pressures;To explore the effects of 6-week pressure training on female soccer players’ body composition,body circumference,isokinetic,maximum strength,sprint running at different distances and changing of direction,and compare the training benefits with those of nonpressure group and traditional group.At the same time,the effects of hormones and bioactive factors such as lactate,growth hormone,insulin-like factor 1,cortisol,testosterone,interleukin 6,creatine kinase,nitric oxide,and myostatin in the blood at different moments before and after the 6-week intervention were explored.Method:Twelve female soccer players were recruited,four kinds of external pressure condition without pressure,50%AOP,60%AOP and 70%AOP,respectively,were performed with 30%1RM intensity of KAATSU semi-squat exercise.Cometa Wave Plus surface electromyography was used to collect the surface EMG signals of the lower limb muscle group,the RMS values and MF values of the gluteal muscle,anterior thigh group,posterior thigh group.The Kistler three-dimensional dynamometer was used to determine the values of vertical jump height,PPO,RFD,v GRF,etc.Twenty-four female soccer players were randomly divided into three groups,eight each in the KAATSU,traditional and control groups.The pressurized group performed 30% 1RM low-intensity pressurized training,the traditional group completed 80% 1RM high-intensity resistance training,and the control group completed 30% 1RM low-intensity no-pressurized training.The subjects in the KAATSU group,the traditional group,and the control group completed 6 weeks of low-intensity pressurized,traditional high-intensity,and low-intensity no-pressurized stripes,three times per week,respectively.Subjects in the KAATSU group,the traditional group,and the control group completed6 weeks of training in the lower half of the squat and the hard pull,jumping deep,and jumping over bar racks three times per week,respectively,to compare the before and after the 6-week intervention,body composition,body circumference,hip and knee isokinetic muscle strength,maximal strength,sprint running at different distances,change of direction and other gains.At the same time,the subjects were compared before and after the 6-week intervention,and the subjects in the pressurized,traditional and control groups were compared in different moments of the serum of lactic acid,growth hormone,insulin-like factor 1,cortisol,testosterone,interleukin 6,creatine kinase,nitric oxide and myostatin and other hormones and bioactive factors in the KAATSU,traditional and control groups.Result:(1)After two-way repeated-measures ANOVA,different pressures of semi-squat had a significant effect on the RMS value and MF value of the medial femoral,lateral femoral,rectus femoris and biceps femoris muscles and RPE value,and with the increase of pressure,the MF value decreased subsequently and the RPE value increased,but there was no further change in muscle activation(RMS value);The interaction between pressure and time was significant(P < 0.05)for RMS values of the medial femoral,lateral femoral and gluteus maximus muscles,as well as for MF values of the rectus femoris,biceps femoris and gluteus maximus muscles;RMS values of the gluteus maximus muscles were significantly decreased(P < 0.05)by pressurized training with different pressurized semi-squats,and RMS standardized values of the gluteus maximus muscles showed an increasing trend(P > 0.05);(2)PAP was induced in both the 50% AOP and 60% AOP groups during the 5min and 10 min vertical jumps after the half-squat intervention(p<0.05),and the50% AOP group had a greater effect of inducing PAP;(3)Jump height,peak power(PPO),and rate of force increase(RFD)of the vertical jumping increased significantly(P < 0.05)in the 50% AOP and 60% AOP groups of the half-squat at 5 and 10 min post-intervention,and the increase was greater in the 50% AOP group,whereas the 70% AOP condition may have caused greater fatigue in the subjects due to the high inflation pressure,which may have impacted the acute exercise performance Improvement;(4)In the KAATSU group,body weight,trunk and leg muscle mass,thigh circumference,and hip circumference increased significantly(P < 0.05),and body fat mass and percent body fat decreased significantly(P < 0.05);(5)The peak moments of knee flexion and extension(P < 0.05)and hip flexion and extension(P < 0.05)of the kicking leg and the supporting leg(except for 300°/s)at different angular velocities were improved in the KAATSU and traditional groups,while the KAATSU group significantly improved the peak moments of hip abduction and adduction of the kicking leg at 60°/s at the hip joint(P < 0.05);(6)Time to 5m,10 m,20m,30 m,5-10 m,T-test,505-test,Illinois test,505-test-before-10 m and after-10 m was significantly reduced in the pressurized group(P < 0.05),where time to T-test and after-10 m of 505-test was significantly shorter in the pressurized group than in the control group after the intervention(P <0.05);(7)At 15 s and 15 min post-intervention,blood lactate concentration was significantly increased in the KAATSU and traditional groups(P < 0.05),and significantly higher than in the control group(P < 0.05);(8)At 15 s post-intervention,serum growth hormone significantly increased in the KAATSU and traditional groups(P < 0.05),peaked at 15 min,and significantly higher than that in the control group(P < 0.05);nitric oxide,and interleukin 6 significantly increased in the serum of the KAATSU and traditional groups at 15 and 30 min post-intervention(P < 0.05);at 15 s post-intervention,serum testosterone concentration in the pressurized group Serum testosterone concentration significantly increased(P < 0.05),cortisol concentration significantly decreased(P < 0.05)after 6w intervention,and insulin-like factor 1 significantly increased(P < 0.05)at 24 h post-intervention;The myostatin was significantly decreased(P < 0.05)in the KAATSU and traditional groups at 15 s,15min,and 30 min post-intervention.Conclusion:(1)Under given volume and intensity,the neuromuscular fatigue and RPE increased with increasing pressure,semi-squats with different pressure induced differently muscle activation,and muscle activation was not further activated with increasing pressure;semi-squats with the 50%AOP or 60% AOP condition can induce PAP,and the 50% AOP condition had a better effect than the 60%AOP,which had a better performance in the 5 min-10 min after the semi-squat intervention;(2)Six weeks of KAATSU training resulted in a significant increase in body weight,a decrease in body fat mass and body fat percentage,and a significant increase in muscle mass and body circumference of the trunk,kicking leg and supporting leg.At the same time,the KAATSU and traditional groups were able to improve the peak flexion and extension moments of the knee and hip joints at different angular velocities,and in addition,the KAATSU group was able to significantly improve the peak hip adduction and abduction moments;the KAATSU and traditional groups were significant improvements in SSC function,short-distance sprinting,and change-ofdirection ability;(3)Blood lactate increased significantly in the KAATSU and traditional groups,the KAATSU group has a greater increase in blood lactate and greater metabolic stress;after acute intervention,serum NO,GH,C,T,and bioactive factors increased significantly in the KAATSU and traditional groups,but the increase with time-differentiated;after the 6-week intervention,serum IGF-1 increased significantly in the pressurized group,and MSTN decreased significant. |
PDF Full Text Request