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

James, Lachlan P., Suchomel, Timothy, McMahon, John, Chavda, Shyam ORCID: https://orcid.org/0000-0001-7745-122X and Comfort, Paul (2019) 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 . ISSN 1064-8011 [Article] (Published online first) (doi:10.1519/JSC.0000000000003316)

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Abstract

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
Research Areas: A. > School of Science and Technology > London Sport Institute
Item ID: 27921
Notes on copyright: This is a non-final version of an article published in final form in: 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. Available at: https://doi.org/10.1519/JSC.0000000000003316
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Depositing User: Shyam Chavda
Date Deposited: 21 Oct 2019 10:48
Last Modified: 15 Aug 2020 21:56
URI: https://eprints.mdx.ac.uk/id/eprint/27921

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