Kinematic and neuromuscular measures of intensity during drop jumps in female volleyball players

Torres-Banduc, M, Ramirez-Campillo, R, Andrade, DC, Calleja-González, J, Nikolaidis, PT, McMahon, JJ ORCID: https://orcid.org/0000-0001-9952-7846 and Comfort, P ORCID: https://orcid.org/0000-0002-1131-8626 2021, 'Kinematic and neuromuscular measures of intensity during drop jumps in female volleyball players' , Frontiers in Psychology, 12 , p. 724070.

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Abstract

The aim of this study was to assess drop jump (DJ) performance variables (jump height, contact time, and reactive strength index) concomitant to surface electromyography (sEMG) of lower limb muscles during DJs from different drop heights (intensities). The eccentric and concentric phase sEMG from the gastrocnemius medialis, biceps femoris, and vastus medialis muscles were assessed during all tests, with sEMG activity normalized to maximal voluntary isometric contraction (MVIC). In a cross-sectional, study, 10 amateur female volleyball players (age 22.1 ± 1.8 years; body mass 72.9 ± 15.2 kg; height 1.70 ± 0.08 m) completed DJs from six heights [15–90 cm (DJ15 to DJ90)]. During DJs there was no jump-target box to rebound on to. Results of one-way analysis of variance (ANOVA) showed that the jump height, contact time, and reactive strength index were not significantly (p > 0.05) different between drop heights. Mean biceps femoris eccentric and concentric sEMG ranged from 27 to 50%, although without significant differences between drop heights. Mean gastrocnemius medialis eccentric and concentric sEMG remained relatively constant (∼60–80% MVIC) across DJs heights, although eccentric values reached 90–120% MVIC from DJ75 to DJ90. Mean variations of ∼50–100% MVIC for eccentric and ∼50–70% MVIC for concentric sEMG activations were observed in the vastus medialis across DJs heights. The biceps femoris eccentric/concentric sEMG ratio during DJ45 (i.e., 1.0) was lower (p = 0.03) compared to the ratio observed after DJ90 (i.e., 3.2). The gastrocnemius medialis and vastus medialis eccentric/concentric sEMG ratio were not significantly different between drop heights. In conclusion, jumping performance and most neuromuscular markers were not sensitive to DJ height (intensity) in amateur female volleyball athletes.

Item Type:	Article
Contributors:	Martin, BJ (Editor), Garcia, MG (Reviewer) and Dufek, JS (Reviewer)
Additional Information:	** From Frontiers via Jisc Publications Router ** Licence for this article: http://creativecommons.org/licenses/by/4.0/ **Journal IDs: eissn 1664-1078 **History: published_online 20-09-2021; accepted 27-08-2021; submitted 11-06-2021; collection 2021
Schools:	Schools > School of Health and Society
Journal or Publication Title:	Frontiers in Psychology
Publisher:	Frontiers Media S.A.
ISSN:	1664-1078
Related URLs:	Publication
SWORD Depositor:	Publications Router
Depositing User:	Publications Router
Date Deposited:	04 Oct 2021 08:57
Last Modified:	15 Feb 2022 17:22
URI:	https://usir.salford.ac.uk/id/eprint/61981

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