Criterion and construct validity of an isometric mid-thigh pull dynamometer for assessing whole body strength in professional rugby league players

Hdl Handle:
http://hdl.handle.net/10034/620540
Title:
Criterion and construct validity of an isometric mid-thigh pull dynamometer for assessing whole body strength in professional rugby league players
Authors:
Dobbin, Nicholas; Hunwicks, Richard; Jones, Ben; Till, Kevin; Highton, JM; Twist, Craig
Abstract:
Purpose: The purpose of this study was to examine the criterion and construct validity of an isometric mid-thigh pull dynamometer to assess whole body strength in professional rugby league players. Methods: Fifty-six male rugby league players, (33 senior and 23 youth professional players) performed four isometric mid-thigh pull efforts (i.e. two on the dynamometer and two on the force platform) in a randomised and counterbalanced order. Results: Isometric peak force was underestimated (P<0.05) using the dynamometer compared to the force platform (95% LoA: -213.5 ± 342.6 N). Linear regression showed that peak force derived from the dynamometer explained 85% (adjusted R2 = 0.85, SEE = 173 N) of the variance in the dependent variable, with the following prediction equation derived: predicted peak force = [1.046 * dynamometer peak force] + 117.594. Cross-validation revealed a non-significant bias (P>0.05) between the predicted and peak force from the force platform, and an adjusted R2 (79.6%), that represented shrinkage of 0.4% relative to the cross-validation model (80%). Peak force was greater for the senior compared to youth professionals using the dynamometer (2261.2 ± 222 cf. 1725.1 ± 298.0 N, respectively; P<0.05). Conclusion: The isometric mid-thigh pull assessed using a dynamometer underestimates criterion peak force but is capable of distinguishing muscle function characteristics between professional rugby league players of different standards.
Affiliation:
University of Chester, Rugby Football League, Leeds Beckett University
Citation:
Dobbin, N., Hunwicks, R., Jones, B., Till, K., Highton, J., & Twist, C. (2017-forthcoming). Criterion and construct validity of an isometric mid-thigh pull dynamometer for assessing whole body strength in professional rugby league players. International Journal of Sports Physiology and Performance.
Publisher:
Human Kinetics
Journal:
International Journal of Sports Physiology and Performance
Publication Date:
2017
URI:
http://hdl.handle.net/10034/620540
DOI:
10.1123/ijspp.2017-0166
Type:
Article
Language:
en
ISSN:
1555-0265
EISSN:
1555-0273
Appears in Collections:
Sport and Exercise Sciences

Full metadata record

DC FieldValue Language
dc.contributor.authorDobbin, Nicholasen
dc.contributor.authorHunwicks, Richarden
dc.contributor.authorJones, Benen
dc.contributor.authorTill, Kevinen
dc.contributor.authorHighton, JMen
dc.contributor.authorTwist, Craigen
dc.date.accessioned2017-06-21T09:04:05Z-
dc.date.available2017-06-21T09:04:05Z-
dc.date.issued2017-
dc.identifier.citationDobbin, N., Hunwicks, R., Jones, B., Till, K., Highton, J., & Twist, C. (2017-forthcoming). Criterion and construct validity of an isometric mid-thigh pull dynamometer for assessing whole body strength in professional rugby league players. International Journal of Sports Physiology and Performance.en
dc.identifier.issn1555-0265en
dc.identifier.doi10.1123/ijspp.2017-0166-
dc.identifier.urihttp://hdl.handle.net/10034/620540-
dc.description.abstractPurpose: The purpose of this study was to examine the criterion and construct validity of an isometric mid-thigh pull dynamometer to assess whole body strength in professional rugby league players. Methods: Fifty-six male rugby league players, (33 senior and 23 youth professional players) performed four isometric mid-thigh pull efforts (i.e. two on the dynamometer and two on the force platform) in a randomised and counterbalanced order. Results: Isometric peak force was underestimated (P<0.05) using the dynamometer compared to the force platform (95% LoA: -213.5 ± 342.6 N). Linear regression showed that peak force derived from the dynamometer explained 85% (adjusted R2 = 0.85, SEE = 173 N) of the variance in the dependent variable, with the following prediction equation derived: predicted peak force = [1.046 * dynamometer peak force] + 117.594. Cross-validation revealed a non-significant bias (P>0.05) between the predicted and peak force from the force platform, and an adjusted R2 (79.6%), that represented shrinkage of 0.4% relative to the cross-validation model (80%). Peak force was greater for the senior compared to youth professionals using the dynamometer (2261.2 ± 222 cf. 1725.1 ± 298.0 N, respectively; P<0.05). Conclusion: The isometric mid-thigh pull assessed using a dynamometer underestimates criterion peak force but is capable of distinguishing muscle function characteristics between professional rugby league players of different standards.en
dc.language.isoenen
dc.publisherHuman Kineticsen
dc.subjectPeak forceen
dc.subjectMeasurement erroren
dc.titleCriterion and construct validity of an isometric mid-thigh pull dynamometer for assessing whole body strength in professional rugby league playersen
dc.typeArticleen
dc.identifier.eissn1555-0273en
dc.contributor.departmentUniversity of Chester, Rugby Football League, Leeds Beckett Universityen
dc.identifier.journalInternational Journal of Sports Physiology and Performanceen
cr.approval.ethicalManuscript has been accepted, but not published: Accepted author manuscript version reprinted, by permission, from International Journal of Sports Physiology and Performance, 2017 (in press). © Human Kinetics, Inc.en
dc.date.accepted2017-06-01-
or.grant.openaccessYesen
rioxxterms.funderUnfundeden
rioxxterms.identifier.projectUnfundeden
rioxxterms.versionAMen
rioxxterms.licenseref.startdate2017-12-31en
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