Association Of Power Measures Obtained During Hang Power Cleans And Jump Squats

Abstract

PURPOSE To establish the association of external power measures obtained during hang power cleans (HPC) and parallel jump squats (PJS). METHODS Forty-eight resistance trained men, (22.9±4.17 y; 83.3±14.55 kg) participated in this study. Subsequent to 3 practice sessions each subject's 1RM mid thigh HPC and 1RM parallel squat were established on two separate days. The minimum 1RM HPC and squat required for inclusion in the study were 70% and 100% body wt., respectively. Subjects subsequently performed 2 single-repetition jump squats at 30% 1RM and 2 single-repetition hang power cleans at 90% 1RM in a counterbalanced manner. Maximum acceleration was emphasized for the concentric phase of both lifts. A computer-interfaced dynamometer tethered to the barbell measured bar velocity while power was calculated based on load, acceleration, and velocity. The association between external power derived from the two lifts was determined using Pearson product-moment correlations. RESULTS ARPD is the average rate of power development from the onset of concentric movement to either the peak or original start position. The 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 2nd 50%. Correlations are reported in Table 1.Table 1: Correlation of Equivalent Hang Power Clean and Jump Squat External Power VariablesCONCLUSIONS Inter-correlations for power measures derived from hang power cleans and jump squats are relatively high suggesting that they represent similar characteristics.