The Effect of PAP Produced by Back Squats with Different Squat Methods on the Ability of Squat Jump

Abstract The aim of this study was to investigate the effects of PAP induced by different squat amplitudes on squat jump and the interaction between squat amplitude, stimulus load (%1RM) and PAP duration, and to establish an exercise intervention programme. Method: Fifteen track and field athletes aged 20-22 years were selected to perform barbell back squats at knee angles of 60°, 90° and 120° and loads of 75% 1RM, 85% 1RM and 95% 1RM, and their flat squat heights were tested at the 3rd, 6th, 9th and 12th minute after each combination of barbell back squats. Results: (1) The 120° knee angle-95%1RM combination produced the best squat jump performance after stimulation (42.47±5.26cm), combinations close to this result include the 120° knee angle-85%1RM (42.27±4.70cm) and the 90° knee angle-95%1RM (42.40±5. 50cm); (2) when load and interval were the same, the effect of different knee angles on squat performance was 120 knee angle > 90 knee angle > 60 knee angle, and when knee angle and interval were the same, the effect of different loads of 1RM on squat performance was 95%1RM>85%1RM>75%1RM, with a high probability of peak occurring at the 9th minute after stimulation. Conclusion: Athletes participating in lower limb explosive power events such as the high jump and long jump should perform a PAP induction with a back squat at a knee angle of 90°-120° and 85-95% of 1RM weight 6-12 minutes prior to competition.