Effect of onset threshold on kinetic and kinematic variables of a weightlifting derivative containing a first and second pull

James, LP, Suchomel, TJ, McMahon, JJ, Chavda, S and Comfort, P ORCID: https://orcid.org/0000-0002-1131-8626 2020, 'Effect of onset threshold on kinetic and kinematic variables of a weightlifting derivative containing a first and second pull' , Journal of strength and conditioning research, 34 (2) , pp. 298-307.

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Abstract

James, LP, Suchomel, TJ, McMahon, JJ, Chavda, S, and Comfort, P. Effect of onset threshold on kinetic and kinematic variables of a weightlifting derivative containing a first and second pull. J Strength Cond Res XX(X): 000-000, 2019-This study sought to determine the effect of different movement onset thresholds on both the reliability and absolute values of performance variables during a weightlifting derivative containing both a first and second pull. Fourteen men (age: 25.21 ± 4.14 years; body mass: 81.1 ± 11.4 kg; and 1 repetition maximum [1RM] power clean: 1.0 ± 0.2 kg·kg) participated in this study. Subjects performed the snatch-grip pull with 70% of their power clean 1RM, commencing from the mid-shank, while isolated on a force platform. Two trials were performed enabling within-session reliability of dependent variables to be determined. Three onset methods were used to identify the initiation of the lift (5% above system weight [SW], the first sample above SW, or 10 N above SW), from which a series of variables were extracted. The first peak phase peak force and all second peak phase kinetic variables were unaffected by the method of determining movement onset; however, several remaining second peak phase variables were significantly different between methods. First peak phase peak force and average force achieved excellent reliability regardless of the onset method used (coefficient of variation [CV] < 5%; intraclass correlation coefficient [ICC] > 0.90). Similarly, during the second peak phase, peak force, average force, and peak velocity achieved either excellent or acceptable reliability (CV < 10%; ICC > 0.80) in all 3 onset conditions. The reliability was generally reduced to unacceptable levels at the first sample and 10 N method across all first peak measures except peak force. When analyzing a weightlifting derivative containing both a first and second pull, the 5% method is recommended as the preferred option of those investigated.

Item Type: Article
Additional Information: ** From PubMed via Jisc Publications Router **Journal IDs: eissn 1533-4287 **Article IDs: pubmed: 31373974 **History: published 01-08-2019
Schools: Schools > School of Health and Society
Journal or Publication Title: Journal of strength and conditioning research
Publisher: Wolters Kluwer
ISSN: 1533-4287
Related URLs:
SWORD Depositor: Publications Router
Depositing User: Publications Router
Date Deposited: 07 Nov 2019 12:08
Last Modified: 13 Mar 2020 12:22
URI: http://usir.salford.ac.uk/id/eprint/52055

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