Comparing biomechanical time series data across countermovement shrug load

Meechan, D ORCID: https://orcid.org/0000-0002-6600-9847, McErlain-Naylor, S, McMahon, J ORCID: https://orcid.org/0000-0001-9952-7846, Suchomel, T and Comfort, P ORCID: https://orcid.org/0000-0002-1131-8626 2022, 'Comparing biomechanical time series data across countermovement shrug load' , Journal of Sports Sciences, 40 (15) , pp. 1658-1667.

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Abstract

The effect of load on time series data has yet to be investigated during weightlifting derivatives. This study compared the effect of load on the force-time and velocity-time curves during the countermovement shrug (CMS). Twenty-nine males performed the CMS at relative loads of 40, 60, 80, 100, 120, and 140% one repetition maximum (1RM) power clean (PC). A force plate measured the vertical ground reaction force (VGRF), which was used to calculate the barbell-lifter system velocity. Time series data were normalized to 100% of the movement duration and assessed via statistical parametric mapping (SPM). SPM analysis showed greater negative velocity at heavier loads early in the unweighting phase (12-38% of the movement), and greater positive velocity at lower loads during the last 16% of the movement. Relative loads of 40% 1RM PC maximised propulsion velocity, whilst 140% 1RM maximized force. At higher loads, the braking and propulsive phases commence at an earlier percentage of the time-normalized movement, and the total absolute durations increase with load. It may be more appropriate to prescribe the CMS during a maximal strength mesocycle given the ability to use supramaximal loads. Future research should assess training at different loads on the effects of performance.

Item Type:	Article
Schools:	Schools > School of Health and Society > Centre for Health Sciences Research
Journal or Publication Title:	Journal of Sports Sciences
Publisher:	Taylor & Francis
ISSN:	0264-0414
Related URLs:	Publication
Depositing User:	DAVID Meechan
Date Deposited:	16 Aug 2022 07:25
Last Modified:	14 Nov 2022 11:00
URI:	https://usir.salford.ac.uk/id/eprint/64235

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