Association Of Vertical Jump Performance To Jump Squat Power Expressions

Abstract

PURPOSE To establish the association in young men of vertical jump (VJ) displacement with various expressions of power obtained during parallel jump squats (PJS). METHODS Subjects were 48 men (age 22.9 ± 4.17 y; bwt 83.3 ± 14.55 kg) with resistance-training backgrounds. Subsequent to 3 practice sessions, displacement was determined for 4 different VJ styles: restricted (RVJ), non-counter movement (NCMVJ), standing (SVJ), and drop (DVJ). At a different time, each subject's 1RM parallel squat (≥ body wt) was determined for standardizing loading on subsequent tests. Within one week, subjects performed maximal PJS with an external load of 30% 1RM. A computer-interfaced dynamometer tethered to the barbell measured bar velocity while power was calculated based on load, acceleration, and velocity. The associations between displacement for the 4 styles of VJ and squat power expressions were determined using inter-class correlations. RESULTS ARPD is the aver rate of power devp from the onset of concentric movement to either peak or start position. Start gradient is the power @ 50% of time to start position/respective elapsed time, and acceleration gradient is the power @ start position/ respective elapsed time for the 2nd 50%. Means, std dev, and associations are reported in Table 1.Table 1: Means, standard deviations, and correlations of four styles of vertical jump and jump squat external power variable acquired at a 30% 1RM load.CONCLUSIONS When expressed relative to body wt, pk power, aver power to pk, and aver power to start position for jump squats performed with a 30% 1RM load were most highly associated (moderate) with the four styles of VJ. A myriad of other power expressions were less associated with VJ displacement. Table 1. Means, standard deviations, and correlations of four styles of vertical jump and jump squat external power variables acquired at a 30% 1RM load. load were most highly associated(moderate) with the four styles of VJ A myriad of other power expressions were less associated with VJ displacment.