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Effect of Onset Threshold on Kinetic and Kinematic Variables of a Weightlifting Derivative Containing a First and Second Pull.
J Strength Cond Res. 2020 Feb; 34(2):298-307.JS

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 34(2): 298-307, 2020-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.

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Publisher Full Text (DOI)

Authors+Show Affiliations

James LP
Department of Rehabilitation, Nutrition and Sport, School of Allied Health, La Trobe University, Victoria, Australia.
Suchomel TJ
Department of Human Movement Sciences, Carroll University, Waukesha, Wisconsin.
McMahon JJ
Directorate of Sport, Exercise and Physiotherapy, University of Salford, Salford, Greater Manchester, United Kingdom; and.
Chavda S
London Sport Institute, School of Science and Technology, Middlesex University, Hendon, United Kingdom.
Comfort P
Directorate of Sport, Exercise and Physiotherapy, University of Salford, Salford, Greater Manchester, United Kingdom; and.

MeSH

AdultBiomechanical PhenomenaHumansKineticsMaleMuscle StrengthReproducibility of ResultsWeight LiftingYoung Adult

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31373974

Citation

James, Lachlan P., et al. "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, vol. 34, no. 2, 2020, pp. 298-307.
James LP, Suchomel TJ, McMahon JJ, et al. Effect of Onset Threshold on Kinetic and Kinematic Variables of a Weightlifting Derivative Containing a First and Second Pull. J Strength Cond Res. 2020;34(2):298-307.
James, L. P., Suchomel, T. J., McMahon, J. J., Chavda, S., & Comfort, P. (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), 298-307. https://doi.org/10.1519/JSC.0000000000003316
James LP, et al. Effect of Onset Threshold On Kinetic and Kinematic Variables of a Weightlifting Derivative Containing a First and Second Pull. J Strength Cond Res. 2020;34(2):298-307. PubMed PMID: 31373974.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of Onset Threshold on Kinetic and Kinematic Variables of a Weightlifting Derivative Containing a First and Second Pull. AU - James,Lachlan P, AU - Suchomel,Timothy J, AU - McMahon,John J, AU - Chavda,Shyam, AU - Comfort,Paul, PY - 2019/8/3/pubmed PY - 2020/8/28/medline PY - 2019/8/3/entrez SP - 298 EP - 307 JF - Journal of strength and conditioning research JO - J Strength Cond Res VL - 34 IS - 2 N2 - 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, 2020-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. SN - 1533-4287 UR - https://www.unboundmedicine.com/medline/citation/31373974/Effect_of_Onset_Threshold_on_Kinetic_and_Kinematic_Variables_of_a_Weightlifting_Derivative_Containing_a_First_and_Second_Pull_ DB - PRIME DP - Unbound Medicine ER -