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THE VALIDITY OF THE VMAXPRO DURING COUNTERMOVEMENT JUMP AND BACK SQUAT PERFORMANCE

Abstract

Hunter Haynes, Riley Galloway, Paul T. Donahue, Scott Piland, Nuno Oliveira. University of Southern Mississippi, Hattiesburg, MS.

Background: Advances in technology have resulted in an increase in the utilization of velocity-based training in the strength and conditioning field while utilization of inertia measurement units (IMUs) shows promise. Methods: Recreationally trained participants (N=25, 28.3 ± 2.9 years) were recruited to determine the validity of the VmaxPro device for measuring performance variables in the back squat and countermovement jump (CMJ) against a gold standard forceplate. Squat variables assessed included mean concentric velocity (MCV), mean concentric power (MCP), depth, and duration while CMJ variables assessed included MCV, MCP, depth, duration, and jump height. Squat variables were assessed across 3 conditions: BW, 50% BW, and 100% BW. Results: MCV demonstrated strong correlations in the BW, 50% and 100% conditions (r= 0.965; r=.907; r= 0.827, p<0.001). MCP demonstrated strong correlations across all 3 squat conditions (r= 0.979, 0.960, and 0.887, respectively). MCV and jump height demonstrated strong correlation (r= 0.6-0.79) in the countermovement jump (r=0.728 p<0.001 and r=0.796 p<0.001, respectively). Bland-Altman analysis demonstrated that all measurements fell within the 95% confidence interval between devices. Mean differences between measures showed a consistent overestimation produced by the VmaxPro device. Conclusion: The VmaxPro is a reasonably valid device for assessing duration, and jump height when assessing CMJ performance as compared to the force plate while demonstrating overestimation bias. For back squat performance variables, the VmaxPro proves as a reasonably valid device for assessing MCV, MCP, depth, and duration while demonstrating overestimation bias in MCV and MCP.

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