(23) IS THERE A RELATIONSHIP BETWEEN ESTIMATED 1-RM FOR THE HEX-BAR DEADLIFT AND COUNTERMOVEMENT JUMP METRICS IN ROTC MALES?

Purpose: The purpose of this study was to see if a predicted one repetitions maximum (1-RM) from the submaximal 3-RM Hex-Bar Deadlift (HDL) and strength ratio (1-RM ÷ body mass) (HDL_Ratio) could correlate with the average propulsive power (AP) peak propulsive power (PP) average relative propulsive power (ARPP) and peak relative propulsive power (PRPP) during a countermovement jump (CMJ) with male collegiate ROTC students. Methods: Twenty healthy college ROTC males (age = 20.35 ± 1.90 years, height 176.84 cm ± 7.63 cm, mass 79.92 kg ± 10.00 kg) volunteered to participate in the study. Any upper or lower extremity injuries resulted in exclusion from the study. A wireless uniaxial dual force plate system sampling at 1,000 Hz was used to measure CMJ performance. Each participant performed two-three CMJ’s, keeping their hands on their hips the entire time, fifteen-thirty seconds of rest were allowed in between attempts. All jumping attempts are included per participant for analysis (average per person per variable). A diagnostic ACFT assessment was performed within 14-21 days post CMJ performance day (due to weather). Maximum strength (1-RM) was calculated from the 3-repetition maximum (weight ÷ (% 1-RM ÷ 100)) from the cadets 3-RM HDL. A Spearmans Rho correlation was used and an alpha of 0.05 was used for level of significance. Results: HDL estimated 1-RM was positively correlated with HDL_Ratio (r=0.91, p=< 0.001), AP (r=0.52, p=0.018) PP (r=0.50, p=0.026) ARPP (r =0.53, p =0.017), and PRPP (r=0.57, p=0.010). For HDL_Ratio, a significant correlation was observed for ARPP (r=0.53, p=0.017) and PRPP (r=0.58, p=0.008), however, no correlations were seen for AP and PP (r=0.27-0.34, p=0.146-.251). Conclusions: The present study observed significant correlations with estimated 1-RM for all strength and CMJ variables (absolute and relative), while HDL_Ratio had significant correlations with only relative CMJ variables. Practical Applications: The present findings suggest lower extremity strength when estimated from a 3-repetition HDL, positively correlates with jumping power metrics. Future ACFT testing may want to also assess CMJ performance, or other lower-extremity dominant assessments to see if such relationships also exist. Acknowledgements: Funding from this project was provided through a grant from the office of Research and Sponsored Programs at the University of Central Oklahoma.