Methodological considerations in assessing countermovement jumps with handheld accentuated eccentric loading

Bright, Thomas E., Harry, John R., Lake, Jason, Mundy, Peter, Theis, Nicola ORCID: 0000-0002-0775-1355 and Hughes, Jonathan D. (2024) Methodological considerations in assessing countermovement jumps with handheld accentuated eccentric loading. Sports Biomechanics. pp. 1-18. doi:10.1080/14763141.2024.2374884 (In Press)

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Abstract

This study aimed to compare the agreement between three-dimensional motion capture and vertical ground reaction force (vGRF) in identifying the point of dumbbell (DB) release during a countermovement jump with accentuated eccentric loading (CMJAEL), and to examine the influence of the vGRF analysis method on the reliability and magnitude of CMJAEL variables. Twenty participants (10 male, 10 female) completed five maximal effort CMJAEL at 20% and 30% of body mass (CMJAEL20 and CMJAEL30, respectively) using DBs. There was large variability between methods in both loading conditions, as indicated by the wide limits of agreement (CMJAEL20 = −0.22 to 0.07 s; CMJAEL30 = −0.29 to 0.14 s). Variables were calculated from the vGRF data, and compared between four methods (forward integration (FI), backward integration (BI), FI adjusted at bottom position (BP), FI adjusted at DB release point (DR)). Greater absolute reliability was observed for variables from DR (CV% ≤ 7.28) compared to BP (CV% ≤ 13.74), although relative reliability was superior following the BP method (ICC ≥ 0.781 vs ≥ 0.606, respectively). The vGRF method shows promise in pinpointing the DB release point when only force platforms are accessible, and a combination of FI and BI analyses is advised to understand CMJAEL dynamics.

Item Type:	Article
Article Type:	Article
Uncontrolled Keywords:	Countermovement jump; Accentuated eccentric loading; 3D motion capture; force platform; Numerical integration
Subjects:	G Geography. Anthropology. Recreation > GV Recreation Leisure > GV557 Sports Q Science > QP Physiology > QP301.H75 Physiology. Sport
Divisions:	Schools and Research Institutes > School of Education and Science
Depositing User:	Charlotte Crutchlow
Date Deposited:	17 Jul 2024 09:46
Last Modified:	19 Jul 2024 11:03
URI:	https://eprints.glos.ac.uk/id/eprint/14238

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