Reliability of technologies to measure the barbell velocity: Implications for monitoring resistance training.

PloS One
Alejandro Martínez-CavaJesús G Pallarés

Abstract

This study investigated the inter- and intra-device agreement of four new devices marketed for barbell velocity measurement. Mean, mean propulsive and peak velocity outcomes were obtained for bench press and full squat exercises along the whole load-velocity spectrum (from light to heavy loads). Measurements were simultaneously registered by two linear velocity transducers T-Force, two linear position transducers Speed4Lifts, two smartphone video-based systems My Lift, and one 3D motion analysis system STT. Calculations included infraclass correlation coefficient (ICC), Bland-Altman Limits of Agreement (LoA), standard error of measurement (SEM), smallest detectable change (SDC) and maximum errors (MaxError). Results were reported in absolute (m/s) and relative terms (%1RM). Three velocity segments were differentiated according to the velocity-load relationships for each exercise: heavy (≥ 80% 1RM), medium (50% < 1RM < 80%) and light loads (≤ 50% 1RM). Criteria for acceptable reliability were ICC > 0.990 and SDC < 0.07 m/s (~5% 1RM). The T-Force device shown the best intra-device agreement (SDC = 0.01-0.02 m/s, LoA <0.01m/s, MaxError = 1.3-2.2%1RM). The Speed4Lifts and STT were found as highly reliable, especially against liftin...Continue Reading

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Citations

Dec 19, 2020·Journal of Sports Sciences·Stuart A McErlain-Naylor, Marco Beato
Feb 7, 2021·International Journal of Sports Physiology and Performance·Steffen HeldLars Donath
Feb 10, 2021·International Journal of Sports Physiology and Performance·Alejandro Martínez-CavaJesús G Pallarés
Dec 15, 2020·Journal of Human Kinetics·Verónica Giráldez-CostasJuan José Salinero
Apr 9, 2021·Scandinavian Journal of Medicine & Science in Sports·David Rodríguez-RosellJuan José González-Badillo
Jun 30, 2021·International Journal of Sports Physiology and Performance·Víctor Rodríguez-RielvesJesús G Pallarés
Jul 2, 2021·Journal of the American Medical Directors Association·Javier Courel-IbáñezMikel Izquierdo
Aug 10, 2021·European Journal of Sport Science·Bruno Viana RosaMarcos Antonio Pereira Dos Santos

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Software Mentioned

iOS
PowerLift
Qualisys Track Manager
Speed4Lifts
My Lift app
VBT
My
STT
My Lift

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