| Objective: This study was conducted to understand the changes in performance of each interval time after different intensity deep squat intervention by comparing the 4th minute,8th minute,12 th minute,and 16 th minute lower limb explosive strength index scores before and after 70%1RM,80%1RM,and 90%1RM load deep squat interventions,and to compare and analyze the effects of different load deep squat interventions and different interval times on the lower limb explosive strength of basketball special students.The results of this study were compared and analyzed in order to find the appropriate load and optimal interval time for the post-activation enhancement effect,and to provide reference for the application of the post-activation enhancement effect in basketball.Methods: Fourteen male students in the basketball specialization class of the School of Physical Education of Sichuan Normal University were selected as test subjects(weighted squat 1RM > 1.5 times body weight)for their own control test,and barbell weighted squat was used as the intervention method.The four measures were vertical jump touch height in situ,standing long jump,jump touch height with one foot,and three-quarter basketball court sprint.The formal tests were conducted in the form of pre-test,squat intervention and post-test,and each measurement was preceded by a pre-test of the subject’s basic performance of the relevant indexes,followed by a weighted squat intervention of 70% 1RM or 80% 1RM or 90% 1RM.The test(in situ vertical jump touch height or standing long jump or assisted one-legged jump touch height or ? basketball court sprint)was performed every 4 minutes after the intervention(4,8,12,and 16 minutes after the intervention),and the test scores were used as post-test values,and finally the results measured were compared and analyzed,firstly,by descriptive analysis of the test scores,and secondly,by using paired-samples t-test to analyze the differences between the subjects’ scores of each index before and after the intervention with different loads;using two-factor repeated measures ANOVA,the analyze the effects of different loads and interval times on the explosive power of lower limbs.Results:(1)Interval time had a significant effect(p<0.05)on all lower limb explosive strength test index scores.Intervention intensity had no significant effect p>0.05 on in situ vertical jump touch height,assisted one-legged jump touch height,and three-quarter basketball court sprint scores,and there was no interaction effect between intervention intensity and interval time.(2)In terms of change in increase: the increase in standing long jump after70%1RM intervention was: 12 min(4.714cm)> 8 min(3.857cm)> 4 min(2.643cm)>16 min(2.357cm);the increase in vertical jump touch height in situ was: 12 min(2.929cm)> 8 min(2cm)> 4 min(1.571cm(1.214cm)> 16 minutes(1.214cm);the increase of jumping height with one foot is: 12 minutes(2.214cm)> 8 minutes(2.143cm)> 4 minutes(1.143cm)= 16 minutes(1.143cm);the increase of three-quarter basketball court sprint is: 12 minutes(0.114cm)> 8 minutes(0.093cm)> 16 minutes(0.046cm)> 4 minutes(0.036cm).(3)After the 80% 1RM intervention,the increase in standing long jump was: 12min(5 cm)> 8 min(4.929 cm)> 16 min(3.929 cm)> 4 min(3.714 cm);increase in vertical jump touch height in situ was: 8 min(2.357 cm)> 12 min(2 cm)> 4 min(1.571 cm)> 16 min(0.5(0.5 cm);the increase of jumping height with one foot was: 8minutes(2.929 cm)> 12 minutes(2.857 cm)> 4 minutes(2 cm)> 16 minutes(0.857cm).Three-quarter basketball court sprint increases were: 12 minutes(0.136 cm)> 8minutes(0.120 cm)> 16 minutes(0.059 cm)> 4 minutes(0.029 cm).(4)After 90% 1RM intervention,the increase in standing long jump was: 8 min =12 min(3.714cm)> 16 min(3.143cm)> 4 min(1.857cm);the increase in vertical jump touch in place was: 12 min(2.214cm)> 8 min(2.143cm)> 16 min(1.429cm)> 4 min(0.071cm).The increase in jumping height with one foot was: 12 minutes(2.5cm)> 8minutes(1.786cm)> 16 minutes(1.5cm)> 4 minutes(0.214cm).The increase of three-quarter basketball court sprint was: 8 minutes(0.152cm)> 12 minutes(0.098cm)> 16 minutes(0.091cm)> 4 minutes(-0.011cm).Conclusion:(1)All three intensities of the deep squat intervention induced a post-activation enhancement effect at the 4th,8th,12 th,and 16 th minutes,and all had different degrees of improvement on lower limb explosive strength.(2)70%1RM and80%1RM interventions had significant effects on lower limb explosive strength in the8th-12 th minutes after the intervention,and no significant effects in the 16 th minute;90%1RM interventions had significant effects on lower limb explosive strength in the8th-16 th minutes after the intervention,and no significant effects in the 4th minute.(3)The optimal interval time for the post-activation enhancement effect induced after different load interventions was 8-12 minutes,with the peak occurring at the 12 th minute. |
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