Document Type
Article
Publication Date
9-2021
Publisher
Lippincott Williams & Wilkins, Inc.
Source Publication
Journal of Strength and Conditioning Research
Source ISSN
1064-8011
Abstract
The purpose of this study was to investigate differences in the force-, velocity-, displacement-, and power-time curves during the hang-power clean (HPC) and the jump shrug (JS). To this end, 15 male lacrosse players were recruited from a National Collegiate Athletic Association Division-I team, and performed one set of 3 repetitions of the HPC and JS at 70% of their HPC 1 repetition maximum (1RM HPC). Two in-ground force plates were used to measure the vertical ground reaction force (GRF) and calculate the barbell-lifter system mechanics during each exercise. The time series data were normalized to 100% of the movement phase, which included the initial countermovement and extension phases, and analyzed with curve analysis and statistical parametric mapping (SPM). The SPM procedure highlighted significant differences in the force-time curves of the HPC and JS between 85 and 100% of the movement phase. Likewise, the SPM procedure highlighted significant differences in the velocity- and power-time curve of the HPC and JS between 90 and 100% of the movement phase. For all comparisons, performance of the JS was associated with greater magnitudes of the mechanical outputs. Although results from the curve analysis showed significant differences during other periods of the movement phase, these differences likely reflect statistical issues related to the inappropriate analysis of time series data. Nonetheless, these results collectively indicate that when compared with the HPC, execution of the JS is characterized by greater GRF and barbell-lifter system velocity and power outputs during the final 10% of the movement phase.
Recommended Citation
Kipp, Kristof; Comfort, Paul; and Suchomel, Timothy J., "Comparing Biomechanical Time Series Data During the Hang-Power Clean and Jump Shrug" (2021). Exercise Science Faculty Research and Publications. 200.
https://epublications.marquette.edu/exsci_fac/200
Comments
Accepted version. Journal of Strength and Conditioning Research, Vol. 35, No. 9 (September 2021): 2389-2396. DOI. © 2021 Lippincott Williams & Wilkins, Inc. Used with permission.