Abstract:
Objective The temporal profile of post-activation potentiation(PAP)between different strength level subjects was explored.
Methods PAP was induced by half back-squat of three repetitions at 90% 1 RM. Threedimensional force platform was used to collect the static squat jump data of thirteen subjects pre and post(15 s, 3 min, 6 min, 9 min and 12 min)PAP. Double-variable repeated measurement design was adopted in the experiment; the flight height, peak impulse and peak power were analyzed by repeated-measures ANOVA (Analysis of Variance)and multiple comparison.
Results ① The flight height(P < 0.01) and peak impulse(P < 0.05)increased significantly at 3 min, 6 min and 9 min compared with the baseline while the peak power increased significantly at 3 min(P < 0.01) and 6 min(P < 0.05)compared with the baseline, and there was no difference between the groups(P>0.05). ②The peak value of each index in normal group appeared at 3 min; the peak value of each index in strong group appeared at 6 min; and the peak value of each index in strong group was greater than that in normal group.
Conclusions After half back-squat of three repetitions at 90% 1 RM in athletes with different strength levels, the temporal profile of flight height and peak impulse is 3-9 min and the temporal profile of peak power is 3-6 min. In addition, the temporal profile of PAP is associated with the athlete's strength level. The peak height, peak impulse and growth rate of peak and peak power of the higher power level are higher than those of the lower power level.
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