The Influence Of Chains Squat Training With Different Chain Load Ratio On The Explosive Power Of Young Basketball Players’ Lower Limbs

Objectives:Through comparing the effects of different chain load ratios of chain squat training on the lower limb explosive strength of youth male basketball players(the chain load ratios are set to no additional chain,10%chain load ratio,20%chain load ratio and 30%chain load ratio)in order to find the most beneficial chain load ratio for lower limb explosive strength improvement.Methods:Through the compilation of literature and the combination of expert’s views to learned the current status of research on chain training was in order to provide theoretical support for the design of training movements,load volume and the arrangement of intervals.Forty-four eligible basketball students were selected from the Yichang No.1 Secondary School Boys’ Basketball Team and Yichang Gymnasium Boys’ Basketball Team.After learning and familiarising themselves with the test items,a pre-test was conducted and subjects were randomly divided into four groups(control group,10%group,20%group and 30%group)using a randomised grouping method,with 11 participants in each group.Each group performed 6 reps with a 2-3min interval between sets,for a total of 5 sets.The specific load settings for each group were:control(no chain load),10%(10%chain load),20%(20%chain load)and 30%(30%chain load).Training was conducted twice a week for 6 weeks,with a minimum recovery time of 48 hours between training sessions.After the 6 weeks of training,all subjects were tested again for their lower limb explosive strength,and the data were statistically analysed from both intra-group and inter-group comparisons.Results:(1)The control group showed significant improvements in 1RM squat(P=0.005),15m x 3 repetitions(P=0.000)and 30m sprint(P=0.000),but not in standing long jump(P=0.165)and half squat long jump touch height(P=0.359).(2)The 10%group showed significant increases in 1RM squat(P=0.005),15m x 3 repetitions(P=0.000),half squat long jump touch height(P=0.017)and 30m sprint(P=0.007),but not in standing long jump(P=0.224).(3)The 20%group showed significant increases in 1RM squat(P=0.007),15m x 3 repetitions(P=0.001),standing long jump(P=0.005),half squat long jump touch(P=0.010)and 30m sprint(P=0.000).(4)The 30%group showed significant improvements in 1RM squat performance(P=0.000),15m x 3 return run performance(P=0.011),standing long jump performance(P=0.000),half squat long jump touch height performance(P=0.000)and 30m sprint run performance(P=0.007).(5)There was no significant difference between the four groups in the improvement of 1RM squat,standing long jump and 30m sprint(P>0.005),but there was a significant difference in the improvement of 15m x 3 repetitions and half squat long jump touch height(P<0.005).(6)For the four groups,the percentage increase in the 1RM squat,standing long jump and half squat long jump touch height showed a "partial increment" with the increase in the percentage of chain load,in the 15m x 3 repetitions,the percentage increase in performance tended to be "partially decreasing".(7)In terms of overall improvement in lower limb explosive power,the four groups were:control(-1.45),10%(-2.40),20%(2.22)and 30%(1.63).Conclusions:(1)After 6 weeks of training,the four different chain load ratios of the chain squat improved the explosive strength of the lower limbs of the subjects to varying degrees.(2)When the chain load was less than or equal to 10%,the chain squat was similar to the conventional squat.(3)Both 20%and 30%of the chain load had a better effect on the explosive strength of the lower limbs than the traditional constant load squat and 10%of the chain load squat.(4)Chain squats with a 20%chain load had the best overall improvement in explosive strength in the lower limbs.