Comparative Study On The Effects Of Eccentric Overload And Fixed Load Repeated Training On The Maximum Muscle Strength And Explosive Power Of Lower Limbs Of Male Fitness Enthusiasts

Objective: This study compared the centrifugal overload training method and fixed load repetitive training method in male fitness enthusiasts’ lower extremity maximum muscle strength and explosive strength training effect,in order to find a better training method to improve the lower extremity maximum muscle strength and explosive strength,and establish a good theoretical basis for the promotion of training methods in the future.Methods:Thirty male body-building enthusiasts with more than one year’s experience in lower limb strength training in Xi’an Institute of physical education were recruited and randomly divided into centrifugal overload group,fixed load repetition group and blank group.The training intervention lasted for eight weeks.The subjects were tested before and after the intervention;In the overload group,120% 1RM was used in the process of centrifugal contraction × 5 times × 6 groups were treated with 80% 1RM ×5 times × 6 groups;In the repetitive group,50% 1RM was used in the whole squat ×20 times × 3 groups;The blank group did not receive any training.Before and after the experiment,the standing long jump,vertical vertical jump,CMJ(squat jump)peak pedal extension,maximum squat 1RM and quadriceps femoris cross-sectional area of the three groups were tested,and the results were integrated,analyzed,compared and tested.Results:After eight weeks of intervention training,the test scores of centrifugal overload training group and fixed load repetitive training group increased and showed significant difference(P < 0.05).The specific performance is as follows: 1)after the training intervention,the standing long jump scores of the three groups were significantly improved(P < 0.05),and there were differences between the two experimental groups(P < 0.05),There was no difference in the blank group before and after the experiment(P > 0.05);2)In terms of CMJ(squat jump)peak push stretch performance,after eight weeks of intervention,the two experimental groups had extremely significant improvement(P < 0.01),the blank group had no significant difference before and after the experiment(P > 0.05),and there was no significant difference among the three groups(P > 0.05);3)After the experiment,the results of vertical jump showed that there were significant differences among the three groups(P < 0.05),extremely significant differences within the overload group(P < 0.01),significant differences in the repetition group(P < 0.05),and no significant differences in the blank group(P > 0.05);4)After the experiment,there were significant differences in the scores of squat 1RM among the three groups(P < 0.05),and there were significant improvements in the overload group and the repetition group(P < 0.05),but there was no significant difference in the blank group(P > 0.05);5)In the growth of cross-sectional area of quadriceps femoris,there was a significant improvement in the two experimental groups(P < 0.05),but there was no significant difference in the blank group(P > 0.05).Conclusions:1)The results of centrifugal overload training and fixed load repeated training for eight weeks were improved in standing long jump,vertical jump,deep squat 1RM and CMJ maximum pedal extension.2)Centrifugal overload training and fixed load repeated training can improve the cross-sectional area of lateral and medial thigh muscles,while the fixed load repeated training has no obvious effect on the cross-sectional area of rectus femoris and middle thigh muscles.3)The training effect of centrifugal overload training group is better than that of the fixed load repetitive training group.