Criterion and construct validity of an isometric mid-thigh pull dynamometer for assessing whole body strength in professional rugby league players
AffiliationUniversity of Chester, Rugby Football League, Leeds Beckett University
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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.
CitationDobbin, N., Hunwicks, R., Jones, B., Till, K., Highton, J., & Twist, C. (2018). 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, 13(2), 235-239. https://doi.org/10.1123/ijspp.2017-0166
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