Validity of a Linear Velocity Transducer for Testing Maximum Vertical Jumps

Journal of Applied Biomechanics
Alejandro Pérez-CastillaAmador García-Ramos

Abstract

This study aimed to examine the validity of mechanical variables obtained by a linear velocity transducer from the unconstrained and constrained squat jump (SJ). Twenty-three men were tested on the unconstrained SJ and the SJ constrained by a Smith machine. Maximum values of force, velocity, and power were simultaneously recorded both by a linear velocity transducer attached to a bar of mass of 17, 30, 45, 60, and 75 kg and by a force plate. Linear velocity transducer generally overestimated the outcomes measured as compared to the force plate, particularly in unconstrained SJ. Bland-Altman plots revealed that heteroscedasticity of errors was mainly observed for velocity variables (r 2 = .26-.58) where the differences were negatively associated with the load magnitude. However, exceptionally high correlations were observed between the same outcomes recorded with the 2 methods in both unconstrained (median r = .89 [.71-.95]) and constrained SJ (r = .90 [.65-.95]). Although the systematic and proportional bias needs to be acknowledged, the high correlations between the variables obtained by 2 methods suggest that the linear velocity transducer could provide valid values of the force, velocity, and power outputs from both unconstr...Continue Reading

References

Jul 3, 2007·Journal of Applied Biomechanics·Prue CormieGrant O McCaulley
Jun 14, 2008·Journal of Strength and Conditioning Research·Li LiJason B Winchester
Sep 16, 2008·Journal of Biomechanics·Pierre SamozinoAlain Belli
Feb 12, 2011·Medicine and Science in Sports and Exercise·Luis Sánchez-Medina, Juan José González-Badillo
Mar 8, 2011·International Journal of Sports Medicine·B T CrewtherG-Z Yang
Feb 6, 2014·Sports Medicine·Daniel Travis McMasterMichael McGuigan
Mar 24, 2016·International Journal of Sports Physiology and Performance·Pedro Jiménez-ReyesJean-Benoît Morin

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Citations

Sep 17, 2019·Journal of Human Kinetics·Amador García-RamosBelén Feriche
Nov 3, 2021·Sports Biomechanics·Adrián Moreno-VillanuevaMarkel Rico-González

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