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

Article


James, L., Suchomel, T., McMahon, J., Chavda, S. and Comfort, P. 2020. Effect of onset threshold on kinetic and kinematic variables of a weightlifting derivative containing a first and second pull. The Journal of Strength and Conditioning Research. 34 (2), pp. 298-307. https://doi.org/10.1519/JSC.0000000000003316
TypeArticle
TitleEffect of onset threshold on kinetic and kinematic variables of a weightlifting derivative containing a first and second pull
AuthorsJames, L., Suchomel, T., McMahon, J., Chavda, S. and Comfort, P.
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.

Keywordsresistance training; strength; power ; testing; data analysis
PublisherLippincott, Williams and Wilkins
JournalThe Journal of Strength and Conditioning Research
ISSN1064-8011
Electronic1533-4287
Publication dates
Online01 Aug 2019
PrintFeb 2020
Publication process dates
Deposited21 Oct 2019
Accepted20 Jun 2019
Output statusPublished
Accepted author manuscript
Copyright Statement

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 34(2): 298–307, February 2020. Available at: https://doi.org/10.1519/JSC.0000000000003316

Digital Object Identifier (DOI)https://doi.org/10.1519/JSC.0000000000003316
Web of Science identifierWOS:000524362300002
LanguageEnglish
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