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  • Crowe_et_al_2019

    Rights statement: Copyright © 2019 by the National Strength & Conditioning Association.

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Restricted Unilateral Ankle Dorsiflexion Movement Increases Interlimb Vertical Force Asymmetries in Bilateral Bodyweight Squatting

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Restricted Unilateral Ankle Dorsiflexion Movement Increases Interlimb Vertical Force Asymmetries in Bilateral Bodyweight Squatting. / Crowe, Martyn A; Bampouras, Theodoros M; Walker-Small, Katie et al.

In: Journal of Strength and Conditioning Research, Vol. 34, No. 2, 01.02.2020, p. 332-336.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

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Crowe MA, Bampouras TM, Walker-Small K, Howe LP. Restricted Unilateral Ankle Dorsiflexion Movement Increases Interlimb Vertical Force Asymmetries in Bilateral Bodyweight Squatting. Journal of Strength and Conditioning Research. 2020 Feb 1;34(2):332-336. Epub 2019 Aug 15. doi: 10.1519/JSC.0000000000003345

Author

Crowe, Martyn A ; Bampouras, Theodoros M ; Walker-Small, Katie et al. / Restricted Unilateral Ankle Dorsiflexion Movement Increases Interlimb Vertical Force Asymmetries in Bilateral Bodyweight Squatting. In: Journal of Strength and Conditioning Research. 2020 ; Vol. 34, No. 2. pp. 332-336.

Bibtex

@article{6bf1d4b10f8e45d2acf786beec096ae5,
title = "Restricted Unilateral Ankle Dorsiflexion Movement Increases Interlimb Vertical Force Asymmetries in Bilateral Bodyweight Squatting",
abstract = "The purpose of this study was to investigate the effect of unilateral restrictions in ankle-dorsiflexion range of motion (DF-ROM) on interlimb vertical ground reaction force (vGRF) asymmetries. Twenty healthy and physically active volunteers (age 23 ± 3 years; height 1.72 ± 0.1 m; mass 74.9 ± 20.3 kg) performed 3 barefoot bodyweight squats (control condition) and with a 10° custom-built forefoot wedge under the right foot to artificially imitate ankle DF-ROM restriction (wedge condition). Force data were used to calculate the mean asymmetry index score for the upper descent phase, lower descent phase, lower ascent phase, and upper ascent phase during the bilateral squat. Significant differences were found for comparisons for each phase between conditions, with effect sizes ranging between 0.7 and 1.1. Asymmetry index scores indicated that for all phases, the unrestricted limb in the wedge condition produced greater vGRF. Therefore, interlimb differences in ankle DF-ROM can cause interlimb asymmetries in vGRF during bilateral squatting. As such, athletes with asymmetrical squat mechanics should be screened for interlimb differences in ankle DF-ROM to ascertain whether it is a contributing factor.",
keywords = "ankle mobility, ankle restriction, squat technique",
author = "Crowe, {Martyn A} and Bampouras, {Theodoros M} and Katie Walker-Small and Howe, {Louis P}",
note = "Copyright {\textcopyright} 2019 by the National Strength & Conditioning Association.",
year = "2020",
month = feb,
day = "1",
doi = "10.1519/JSC.0000000000003345",
language = "English",
volume = "34",
pages = "332--336",
journal = "Journal of Strength and Conditioning Research",
issn = "1064-8011",
publisher = "NSCA National Strength and Conditioning Association",
number = "2",

}

RIS

TY - JOUR

T1 - Restricted Unilateral Ankle Dorsiflexion Movement Increases Interlimb Vertical Force Asymmetries in Bilateral Bodyweight Squatting

AU - Crowe, Martyn A

AU - Bampouras, Theodoros M

AU - Walker-Small, Katie

AU - Howe, Louis P

N1 - Copyright © 2019 by the National Strength & Conditioning Association.

PY - 2020/2/1

Y1 - 2020/2/1

N2 - The purpose of this study was to investigate the effect of unilateral restrictions in ankle-dorsiflexion range of motion (DF-ROM) on interlimb vertical ground reaction force (vGRF) asymmetries. Twenty healthy and physically active volunteers (age 23 ± 3 years; height 1.72 ± 0.1 m; mass 74.9 ± 20.3 kg) performed 3 barefoot bodyweight squats (control condition) and with a 10° custom-built forefoot wedge under the right foot to artificially imitate ankle DF-ROM restriction (wedge condition). Force data were used to calculate the mean asymmetry index score for the upper descent phase, lower descent phase, lower ascent phase, and upper ascent phase during the bilateral squat. Significant differences were found for comparisons for each phase between conditions, with effect sizes ranging between 0.7 and 1.1. Asymmetry index scores indicated that for all phases, the unrestricted limb in the wedge condition produced greater vGRF. Therefore, interlimb differences in ankle DF-ROM can cause interlimb asymmetries in vGRF during bilateral squatting. As such, athletes with asymmetrical squat mechanics should be screened for interlimb differences in ankle DF-ROM to ascertain whether it is a contributing factor.

AB - The purpose of this study was to investigate the effect of unilateral restrictions in ankle-dorsiflexion range of motion (DF-ROM) on interlimb vertical ground reaction force (vGRF) asymmetries. Twenty healthy and physically active volunteers (age 23 ± 3 years; height 1.72 ± 0.1 m; mass 74.9 ± 20.3 kg) performed 3 barefoot bodyweight squats (control condition) and with a 10° custom-built forefoot wedge under the right foot to artificially imitate ankle DF-ROM restriction (wedge condition). Force data were used to calculate the mean asymmetry index score for the upper descent phase, lower descent phase, lower ascent phase, and upper ascent phase during the bilateral squat. Significant differences were found for comparisons for each phase between conditions, with effect sizes ranging between 0.7 and 1.1. Asymmetry index scores indicated that for all phases, the unrestricted limb in the wedge condition produced greater vGRF. Therefore, interlimb differences in ankle DF-ROM can cause interlimb asymmetries in vGRF during bilateral squatting. As such, athletes with asymmetrical squat mechanics should be screened for interlimb differences in ankle DF-ROM to ascertain whether it is a contributing factor.

KW - ankle mobility

KW - ankle restriction

KW - squat technique

U2 - 10.1519/JSC.0000000000003345

DO - 10.1519/JSC.0000000000003345

M3 - Journal article

C2 - 31425458

VL - 34

SP - 332

EP - 336

JO - Journal of Strength and Conditioning Research

JF - Journal of Strength and Conditioning Research

SN - 1064-8011

IS - 2

ER -