Validity and Reliability of Using Load-Velocity Relationship Profiles to Establish Back Squat 1 m·s-1 Load.

Autor:	Elsworthy N; School of Health, Medical and Applied Sciences, Central Queensland University, Queensland, Australia., Callaghan DE; School of Health, Medical and Applied Sciences, Central Queensland University, Queensland, Australia.; Mackay Cutters Rugby League Club, Mackay, Queensland, Australia., Scanlan AT; School of Health, Medical and Applied Sciences, Central Queensland University, Queensland, Australia.; Human Exercise and Training Laboratory, Central Queensland University, Rockhampton, Queensland, Australia., Kertesz AHM; Mackay Cutters Rugby League Club, Mackay, Queensland, Australia., Kean CO; School of Health, Medical and Applied Sciences, Central Queensland University, Queensland, Australia., Dascombe BJ; Applied Sport Science and Exercise Testing Laboratory, University of Newcastle, Ourimbah, NSW, Australia; and.; Priority Research Center in Physical Activity and Nutrition, University of Newcastle, Callaghan, Australia., Guy JH; School of Health, Medical and Applied Sciences, Central Queensland University, Queensland, Australia.
Jazyk:	angličtina
Zdroj:	Journal of strength and conditioning research [J Strength Cond Res] 2021 Feb 01; Vol. 35 (2), pp. 340-346.
DOI:	10.1519/JSC.0000000000003871
Abstrakt:	Abstract: Elsworthy, N, Callaghan, DE, Scanlan, AT, Kertesz, AHM, Kean, CO, Dascombe, BJ, and Guy, JH. Validity and reliability of using load-velocity relationship profiles to establish back squat 1 m·s-1 load. J Strength Cond Res 35(2): 340-346, 2021-Although measuring movement velocity during resistance exercise is being increasingly used to monitor player readiness for competition in team sports, the validity and reliability of using set target velocities has not been examined. This study examined test-retest reliability of the load-velocity relationship during the back squat to predict loads corresponding to a mean velocity of 1 m·s-1 (V1Load), test-retest reliability of mean concentric velocity at V1Load, and criterion validity of mean concentric velocity at V1Load. Twenty-seven resistance-trained male rugby league players completed 2 testing sessions on separate days to establish individualized back squat load-velocity relationship profiles (30, 40, 60, and 80% estimated 1 repetition maximum). Velocity during the back squat was assessed at each load and V1Load derived using individualized linear regression equations. A subset of subjects (n = 18) also performed the back squat at predicted V1Load to examine the test-retest reliability and compare the mean concentric velocity with the predicted target of 1 m·s-1. The mean concentric velocity was consistent across all loads during load-velocity relationship testing (p > 0.05, intraclass correlation coefficient [ICC] ≥0.75, coefficient of variation [CV] ≤5.7%, effect size [ES] ≤0.27), and for predicting V1Load (p = 0.11, ICC = 0.95, CV = 3.9%, ES = 0.11). The mean concentric velocity at V1Load was reliable (ICC = 0.77; CV = 2.6%; ES = 0.39) and not significantly different (p = 0.21) to the target velocity, supporting criterion validity. Individualized load-velocity profiles for the back squat can accurately predict V1Load, and subsequent use of V1Load to assess back squat velocity is valid and reliable. Using V1Load to assess changes in back squat velocity may have application in measuring changes in strength and power or readiness to train. (Copyright © 2020 National Strength and Conditioning Association.)
Databáze:	MEDLINE
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