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Repetition velocity as a measure of loading intensity in the free weight and Smith machine Bulgarian split squat

This study investigated the grouped and individualized load-velocity profile (GLVP vs. ILVP) in Bulgarian split squat using Smith machine and free weight. Seventy five recreational male lifters completed two incremental loading tests of Bulgarian split squat. Mean velocity was measured by a linear-p...

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Autores principales: Liao, Kaifang, Bian, Chao, Chen, Zhili, Yuan, Zhihang, Bishop, Chris, Han, Mengyuan, Li, Yongming, Zheng, Yong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: PeerJ Inc. 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10437032/
https://www.ncbi.nlm.nih.gov/pubmed/37601249
http://dx.doi.org/10.7717/peerj.15863
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author Liao, Kaifang
Bian, Chao
Chen, Zhili
Yuan, Zhihang
Bishop, Chris
Han, Mengyuan
Li, Yongming
Zheng, Yong
author_facet Liao, Kaifang
Bian, Chao
Chen, Zhili
Yuan, Zhihang
Bishop, Chris
Han, Mengyuan
Li, Yongming
Zheng, Yong
author_sort Liao, Kaifang
collection PubMed
description This study investigated the grouped and individualized load-velocity profile (GLVP vs. ILVP) in Bulgarian split squat using Smith machine and free weight. Seventy five recreational male lifters completed two incremental loading tests of Bulgarian split squat. Mean velocity was measured by a linear-position transducer (GymAware). Linear regression equation was applied to construct the GLVP and ILVP. The agreement of predicted %1RM and measured %1RM was assessed by a combination of intraclass correlation coefficient (ICC), coefficient of variation (CV), standard error of measurement (SEM) and Bland-Altman analysis. Acceptable validity was defined as ICC > 0.75, CV ≤ 10% and p ≥ 0.05 (a paired Wilcoxon signed-rank test). A very high level of inverse load-velocity relationships were demonstrated in Bulgarian split squat (r =  − 0.92) with free weights and a Smith machine. ILVP (ICC ≥ 0.98, CV ≤ 8.73%, p ≥ 0.56) was valid enough to predict the %1RM, but GLVP of both limbs revealed large CVs in free weights (CV: 15.4%,15.63%) and a Smith machine (CV: 11.24%, 12.25%). Cross-validation between the actual %1RM and predicted %1RM using free weights and a Smith machine ILVP was not acceptable (p ≤ 0.03, CV ≥ 14.07%). A very high level of inverse relationship were observed between %1RM and MV in Bulgarian split squat using free weights and a Smith machine, indicating individualized load velocity properties, and the ILVP showed high between-devices variability in both scenarios. Using velocity as a measure of loading intensity in Bulgarian split squat needs to consider the individualized load velocity properties, and difference between free weights and a Smith machine.
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spelling pubmed-104370322023-08-19 Repetition velocity as a measure of loading intensity in the free weight and Smith machine Bulgarian split squat Liao, Kaifang Bian, Chao Chen, Zhili Yuan, Zhihang Bishop, Chris Han, Mengyuan Li, Yongming Zheng, Yong PeerJ Kinesiology This study investigated the grouped and individualized load-velocity profile (GLVP vs. ILVP) in Bulgarian split squat using Smith machine and free weight. Seventy five recreational male lifters completed two incremental loading tests of Bulgarian split squat. Mean velocity was measured by a linear-position transducer (GymAware). Linear regression equation was applied to construct the GLVP and ILVP. The agreement of predicted %1RM and measured %1RM was assessed by a combination of intraclass correlation coefficient (ICC), coefficient of variation (CV), standard error of measurement (SEM) and Bland-Altman analysis. Acceptable validity was defined as ICC > 0.75, CV ≤ 10% and p ≥ 0.05 (a paired Wilcoxon signed-rank test). A very high level of inverse load-velocity relationships were demonstrated in Bulgarian split squat (r =  − 0.92) with free weights and a Smith machine. ILVP (ICC ≥ 0.98, CV ≤ 8.73%, p ≥ 0.56) was valid enough to predict the %1RM, but GLVP of both limbs revealed large CVs in free weights (CV: 15.4%,15.63%) and a Smith machine (CV: 11.24%, 12.25%). Cross-validation between the actual %1RM and predicted %1RM using free weights and a Smith machine ILVP was not acceptable (p ≤ 0.03, CV ≥ 14.07%). A very high level of inverse relationship were observed between %1RM and MV in Bulgarian split squat using free weights and a Smith machine, indicating individualized load velocity properties, and the ILVP showed high between-devices variability in both scenarios. Using velocity as a measure of loading intensity in Bulgarian split squat needs to consider the individualized load velocity properties, and difference between free weights and a Smith machine. PeerJ Inc. 2023-08-15 /pmc/articles/PMC10437032/ /pubmed/37601249 http://dx.doi.org/10.7717/peerj.15863 Text en ©2023 Liao et al. https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.
spellingShingle Kinesiology
Liao, Kaifang
Bian, Chao
Chen, Zhili
Yuan, Zhihang
Bishop, Chris
Han, Mengyuan
Li, Yongming
Zheng, Yong
Repetition velocity as a measure of loading intensity in the free weight and Smith machine Bulgarian split squat
title Repetition velocity as a measure of loading intensity in the free weight and Smith machine Bulgarian split squat
title_full Repetition velocity as a measure of loading intensity in the free weight and Smith machine Bulgarian split squat
title_fullStr Repetition velocity as a measure of loading intensity in the free weight and Smith machine Bulgarian split squat
title_full_unstemmed Repetition velocity as a measure of loading intensity in the free weight and Smith machine Bulgarian split squat
title_short Repetition velocity as a measure of loading intensity in the free weight and Smith machine Bulgarian split squat
title_sort repetition velocity as a measure of loading intensity in the free weight and smith machine bulgarian split squat
topic Kinesiology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10437032/
https://www.ncbi.nlm.nih.gov/pubmed/37601249
http://dx.doi.org/10.7717/peerj.15863
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