Effect of knee and trunk angle on kinetic variables during the isometric mid-thigh pull : test-retest reliability

Comfort, P ORCID: https://orcid.org/0000-0002-1131-8626, Jones, PA ORCID: https://orcid.org/0000-0002-3295-7670, McMahon, JJ ORCID: https://orcid.org/0000-0001-9952-7846 and Newton, R 2015, 'Effect of knee and trunk angle on kinetic variables during the isometric mid-thigh pull : test-retest reliability' , International Journal of Sports Physiology and Performance, 10 (1) , pp. 58-63.

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The isometric midthigh pull (IMTP) has been used to monitor changes in force, maximum rate of force development (mRFD), and impulse, with performance in this task being associated with performance in athletic tasks. Numerous postures have been adopted in the literature, which may affect the kinetic variables during the task; therefore, the aim of this investigation was to determine whether different knee-joint angles (120°, 130°, 140°, and 150°) and hip-joint angles (125° and 145°), including the subjects preferred posture, affect force, mRFD, and impulse during the IMTP. Intraclass correlation coefficients demonstrated high within-session reliability (r ≥ .870, P < .001) for all kinetic variables determined in all postures, excluding impulse measures during the 130° knee-flexion, 125° hip-flexion posture, which showed a low to moderate reliability (r = .666-.739, P < .001), while between-sessions testing demonstrated high reliability (r > .819, P < .001) for all kinetic variables. There were no significant differences in peak force (P > .05, Cohen d = 0.037, power = .408), mRFD (P > .05, Cohen d = 0.037, power = .409), or impulse at 100 ms (P > .05, Cohen d = 0.056, power = .609), 200 ms (P > .05, Cohen d = 0.057, power = .624), or 300 ms (P > .05, Cohen d = 0.061, power = .656) across postures. Smallest detectable differences demonstrated that changes in performance of >1.3% in peak isometric force, >10.3% in mRFD, >5.3% in impulse at 100 ms, >4.4% in impulse at 200 ms, and >7.1% in impulse at 300 ms should be considered meaningful, irrespective of posture.

Item Type: Article
Themes: Health and Wellbeing
Schools: Schools > School of Health and Society > Centre for Health Sciences Research
Journal or Publication Title: International Journal of Sports Physiology and Performance
Publisher: Human Kinetics
Refereed: Yes
ISSN: 1555-0265
Related URLs:
Funders: Non funded research
Depositing User: Dr Paul Comfort
Date Deposited: 23 Dec 2014 13:08
Last Modified: 15 Feb 2022 18:51
URI: https://usir.salford.ac.uk/id/eprint/33258

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