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Increases in Variation of Barbell Kinematics Are Observed with Increasing Intensity in a Graded Back Squat Test

The purpose of the current study was two-fold: (1) To examine the variation in velocity and power with increasing intensity in the back squat among subjects; and (2) To explore individual subject characteristics as possible explanations for variations of velocity in the back squat. Fourteen recreati...

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Autores principales: Carroll, Kevin M., Sato, Kimitake, Bazyler, Caleb D., Triplett, N. Travis, Stone, Michael H.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5968951/
https://www.ncbi.nlm.nih.gov/pubmed/29910411
http://dx.doi.org/10.3390/sports5030051
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author Carroll, Kevin M.
Sato, Kimitake
Bazyler, Caleb D.
Triplett, N. Travis
Stone, Michael H.
author_facet Carroll, Kevin M.
Sato, Kimitake
Bazyler, Caleb D.
Triplett, N. Travis
Stone, Michael H.
author_sort Carroll, Kevin M.
collection PubMed
description The purpose of the current study was two-fold: (1) To examine the variation in velocity and power with increasing intensity in the back squat among subjects; and (2) To explore individual subject characteristics as possible explanations for variations of velocity in the back squat. Fourteen recreationally trained male subjects with experience in the back squat agreed to participate in the study (age = 25.0 ± 2.6 years, height = 178.9 ± 8.1 cm, body mass = 88.2 ± 15.8 kg). One-repetition maximums (1RM) were performed for each subject on force platforms with four linear position transducers attached to the barbell. The 1RM assessment was immediately preceded by warm-up sets at 65%, 75%, 85%, and 95% of estimated 1RM for 5, 3, 2, and 1 repetitions, respectively. Mean concentric velocity (MCV) and mean power were recorded for each intensity condition and were analyzed using Pearson correlation to determine the relationship between each variable and relative intensity (%1RM). Statistically significant negative relationships existed between %1RM and MCV (r = −0.892) and mean power (r = −0.604). Between-subject coefficient of variation tended to increase as %1RM increased for both MCV and mean power. These results suggest that MCV is superior to mean power as an indicator of relative intensity in the back squat. Additionally, the between-subject variation observed at higher intensities for MCV and mean power support the use of velocity ranges by strength and conditioning coaches.
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spelling pubmed-59689512018-06-13 Increases in Variation of Barbell Kinematics Are Observed with Increasing Intensity in a Graded Back Squat Test Carroll, Kevin M. Sato, Kimitake Bazyler, Caleb D. Triplett, N. Travis Stone, Michael H. Sports (Basel) Article The purpose of the current study was two-fold: (1) To examine the variation in velocity and power with increasing intensity in the back squat among subjects; and (2) To explore individual subject characteristics as possible explanations for variations of velocity in the back squat. Fourteen recreationally trained male subjects with experience in the back squat agreed to participate in the study (age = 25.0 ± 2.6 years, height = 178.9 ± 8.1 cm, body mass = 88.2 ± 15.8 kg). One-repetition maximums (1RM) were performed for each subject on force platforms with four linear position transducers attached to the barbell. The 1RM assessment was immediately preceded by warm-up sets at 65%, 75%, 85%, and 95% of estimated 1RM for 5, 3, 2, and 1 repetitions, respectively. Mean concentric velocity (MCV) and mean power were recorded for each intensity condition and were analyzed using Pearson correlation to determine the relationship between each variable and relative intensity (%1RM). Statistically significant negative relationships existed between %1RM and MCV (r = −0.892) and mean power (r = −0.604). Between-subject coefficient of variation tended to increase as %1RM increased for both MCV and mean power. These results suggest that MCV is superior to mean power as an indicator of relative intensity in the back squat. Additionally, the between-subject variation observed at higher intensities for MCV and mean power support the use of velocity ranges by strength and conditioning coaches. MDPI 2017-07-14 /pmc/articles/PMC5968951/ /pubmed/29910411 http://dx.doi.org/10.3390/sports5030051 Text en © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Carroll, Kevin M.
Sato, Kimitake
Bazyler, Caleb D.
Triplett, N. Travis
Stone, Michael H.
Increases in Variation of Barbell Kinematics Are Observed with Increasing Intensity in a Graded Back Squat Test
title Increases in Variation of Barbell Kinematics Are Observed with Increasing Intensity in a Graded Back Squat Test
title_full Increases in Variation of Barbell Kinematics Are Observed with Increasing Intensity in a Graded Back Squat Test
title_fullStr Increases in Variation of Barbell Kinematics Are Observed with Increasing Intensity in a Graded Back Squat Test
title_full_unstemmed Increases in Variation of Barbell Kinematics Are Observed with Increasing Intensity in a Graded Back Squat Test
title_short Increases in Variation of Barbell Kinematics Are Observed with Increasing Intensity in a Graded Back Squat Test
title_sort increases in variation of barbell kinematics are observed with increasing intensity in a graded back squat test
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5968951/
https://www.ncbi.nlm.nih.gov/pubmed/29910411
http://dx.doi.org/10.3390/sports5030051
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