Contemporary approaches to isokinetic strength assessments in professional football players

Steven Eustace; Richard  Page; Matt Greig

doi:10.1080/24733938.2017.1371851

Contemporary approaches to isokinetic strength assessments in professional football players

Steven Eustace, Richard Page, Matt Greig

Research output: Contribution to journal › Article

9 Citations (Scopus)

8 Downloads (Pure)

Abstract

Purpose: To assess traditional and novel isokinetic strength characteristics of the eccentric knee flexor (eccKF) and concentric knee extensor (conKE) musculature, 26 professional football players completed bilateral conKE and eccKF contractions at angular velocities of 180, 270, and 60° · s−1 . Method: Peak torque (PT), angle of peak torque (APT), angle-specific torque (AST) analysed every 10° between 40° and 70°, functional range (FR), and dynamic control ratios (DCR) calculated from both the PT (DCRPT) and AST data (DCRAST) were analysed. Results: The PT, APT, and FR data elicited significant contraction*angular velocity interactions (P < 0.001). Significant main effects for contraction*angular velocity*angle and contraction*angular velocity*limb*angle interactions (P ≤ 0.001) were identified for AST data. The DCRPT data elicited a significant main effect for angular velocity (P < 0.001) and limb (P = 0.018), whereas the DCRAST data were significantly different across angles (P < 0.001) and elicited a significant (P = 0.002) limb*angle interaction. Conclusion: Traditional analysis variables utilised for isokinetic strength assessments in football may not be appropriate and/or sensitive enough to identify injury risk. Practitioners should utilise the novel metrics proposed in the current study and conduct assessments across a range of joint angles and angular velocities

Original language	English
Pages (from-to)	251-257
Number of pages	7
Journal	Science and Medicine in Football
Volume	1
Issue number	3
Early online date	29 Aug 2017
DOIs	https://doi.org/10.1080/24733938.2017.1371851
Publication status	Published - 2017
Externally published	Yes

Bibliographical note

This is an Accepted Manuscript of an article published by Taylor & Francis in Science and Medicine in Football on 29/08/17, available online: http://www.tandfonline.com/10.1080/24733938.2017.1371851

Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.

Keywords

Screening
Peak torque
Injury risk
Angle of peak torque
Dynamic control ratio

Access to Document

10.1080/24733938.2017.1371851

Post-PrintAccepted author manuscript, 992 KB

https://research.edgehill.ac.uk/en/publications/contemporary-approaches-to-isokinetic-strength-assessments-in-pro-2

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Cite this

Eustace, S., Page, R., & Greig, M. (2017). Contemporary approaches to isokinetic strength assessments in professional football players. Science and Medicine in Football , 1(3), 251-257. https://doi.org/10.1080/24733938.2017.1371851

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title = "Contemporary approaches to isokinetic strength assessments in professional football players",

abstract = "Purpose: To assess traditional and novel isokinetic strength characteristics of the eccentric knee flexor (eccKF) and concentric knee extensor (conKE) musculature, 26 professional football players completed bilateral conKE and eccKF contractions at angular velocities of 180, 270, and 60° · s−1 . Method: Peak torque (PT), angle of peak torque (APT), angle-specific torque (AST) analysed every 10° between 40° and 70°, functional range (FR), and dynamic control ratios (DCR) calculated from both the PT (DCRPT) and AST data (DCRAST) were analysed. Results: The PT, APT, and FR data elicited significant contraction*angular velocity interactions (P < 0.001). Significant main effects for contraction*angular velocity*angle and contraction*angular velocity*limb*angle interactions (P ≤ 0.001) were identified for AST data. The DCRPT data elicited a significant main effect for angular velocity (P < 0.001) and limb (P = 0.018), whereas the DCRAST data were significantly different across angles (P < 0.001) and elicited a significant (P = 0.002) limb*angle interaction. Conclusion: Traditional analysis variables utilised for isokinetic strength assessments in football may not be appropriate and/or sensitive enough to identify injury risk. Practitioners should utilise the novel metrics proposed in the current study and conduct assessments across a range of joint angles and angular velocities",

keywords = "Screening, Peak torque, Injury risk, Angle of peak torque, Dynamic control ratio",

author = "Steven Eustace and Richard Page and Matt Greig",

note = "This is an Accepted Manuscript of an article published by Taylor & Francis in Science and Medicine in Football on 29/08/17, available online: http://www.tandfonline.com/10.1080/24733938.2017.1371851 Copyright {\circledC} and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.",

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doi = "10.1080/24733938.2017.1371851",

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AU - Page, Richard

AU - Greig, Matt

N1 - This is an Accepted Manuscript of an article published by Taylor & Francis in Science and Medicine in Football on 29/08/17, available online: http://www.tandfonline.com/10.1080/24733938.2017.1371851 Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.

PY - 2017

Y1 - 2017

N2 - Purpose: To assess traditional and novel isokinetic strength characteristics of the eccentric knee flexor (eccKF) and concentric knee extensor (conKE) musculature, 26 professional football players completed bilateral conKE and eccKF contractions at angular velocities of 180, 270, and 60° · s−1 . Method: Peak torque (PT), angle of peak torque (APT), angle-specific torque (AST) analysed every 10° between 40° and 70°, functional range (FR), and dynamic control ratios (DCR) calculated from both the PT (DCRPT) and AST data (DCRAST) were analysed. Results: The PT, APT, and FR data elicited significant contraction*angular velocity interactions (P < 0.001). Significant main effects for contraction*angular velocity*angle and contraction*angular velocity*limb*angle interactions (P ≤ 0.001) were identified for AST data. The DCRPT data elicited a significant main effect for angular velocity (P < 0.001) and limb (P = 0.018), whereas the DCRAST data were significantly different across angles (P < 0.001) and elicited a significant (P = 0.002) limb*angle interaction. Conclusion: Traditional analysis variables utilised for isokinetic strength assessments in football may not be appropriate and/or sensitive enough to identify injury risk. Practitioners should utilise the novel metrics proposed in the current study and conduct assessments across a range of joint angles and angular velocities

AB - Purpose: To assess traditional and novel isokinetic strength characteristics of the eccentric knee flexor (eccKF) and concentric knee extensor (conKE) musculature, 26 professional football players completed bilateral conKE and eccKF contractions at angular velocities of 180, 270, and 60° · s−1 . Method: Peak torque (PT), angle of peak torque (APT), angle-specific torque (AST) analysed every 10° between 40° and 70°, functional range (FR), and dynamic control ratios (DCR) calculated from both the PT (DCRPT) and AST data (DCRAST) were analysed. Results: The PT, APT, and FR data elicited significant contraction*angular velocity interactions (P < 0.001). Significant main effects for contraction*angular velocity*angle and contraction*angular velocity*limb*angle interactions (P ≤ 0.001) were identified for AST data. The DCRPT data elicited a significant main effect for angular velocity (P < 0.001) and limb (P = 0.018), whereas the DCRAST data were significantly different across angles (P < 0.001) and elicited a significant (P = 0.002) limb*angle interaction. Conclusion: Traditional analysis variables utilised for isokinetic strength assessments in football may not be appropriate and/or sensitive enough to identify injury risk. Practitioners should utilise the novel metrics proposed in the current study and conduct assessments across a range of joint angles and angular velocities

KW - Screening

KW - Peak torque

KW - Injury risk

KW - Angle of peak torque

KW - Dynamic control ratio

U2 - 10.1080/24733938.2017.1371851

DO - 10.1080/24733938.2017.1371851

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EP - 257

JO - Science and Medicine in Football

JF - Science and Medicine in Football

SN - 2473-3938

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ER -