Northampton Electronic Collection of Theses and Research

Variable, but not free-weight, resistance back squat exercise potentiates jump performance following a comprehensive task-specific warm-up

Mina, M. A., Blazevich, A. J., Tsatalas, T., Giakas, G., Seitz, L. B. and Kay, A. D. (2019) Variable, but not free-weight, resistance back squat exercise potentiates jump performance following a comprehensive task-specific warm-up. Scandinavian Journal of Medicine & Science in Sports. 29(3), pp. 380-392. 0905-7188.

Item Type: Article
Abstract: Studies examining acute, high-speed movement performance enhancement following intense muscular contractions (frequently called "post-activation potentiation"; PAP) often impose a limited warm-up, compromizing external validity. In the present study, the effects on countermovement vertical jump (CMJ) performance of back squat exercises performed with or without elastic bands during warm-up were compared. After familiarization, fifteen active men visited the laboratory on two occasions under randomized, counterbalanced experimental squat warm-up conditions: (a) free-weight resistance (FWR) and (b) variable resistance (VR). After completing a comprehensive task-specific warm-up, three maximal CMJs were performed followed by three back squat repetitions completed at 85% of 1-RM using either FWR or VR Three CMJs were then performed 30 seconds, 4 minutes, 8 minutes, and 12 minutes later. During CMJ trials, hip, knee, and ankle joint kinematics, ground reaction force data and vastus medialis, vastus lateralis, and gluteus maximus electromyograms (EMG) were recorded simultaneously using 3D motion analysis, force platform, and EMG techniques, respectively. No change in any variable occurred after FWR (P > 0.05). Significant increases (P < 0.05) were detected at all time points following VR in CMJ height (5.3%-6.5%), peak power (4.4%-5.9%), rate of force development (12.9%-19.1%), peak concentric knee angular velocity (3.1%-4.1%), and mean concentric vastus lateralis EMG activity (27.5%-33.4%). The lack of effect of the free-weight conditioning contractions suggests that the comprehensive task-specific warm-up routine mitigated any further performance augmentation. However, the improved CMJ performance following the use of elastic bands is indicative that specific alterations in force-time properties of warm-up exercises may further improve performance.
Additional Information: © 2018 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.
Uncontrolled Keywords: elastic bands, PAP, conditioning activity, explosive strength, kinetics, kinematics
Creators: Mina, Minas A, Blazevich, Anthony J, Tsatalas, Themistoklis, Giakas, Giannis, Seitz, Laurent B and Kay, Anthony D
Faculties, Divisions and Institutes: Faculties > Faculty of Health & Society > Sports, Exercise & Life Sciences
Research Centres > Centre for Physical Activity and Life Sciences
Date: 1 March 2019
Date Type: Publication
Page Range: pp. 380-392
Journal or Publication Title: Scandinavian Journal of Medicine & Science in Sports
Volume: 29
Number: 3
Number of Pages: 13
Language: English
DOI: https://doi.org/10.1111/sms.13341
ISSN: 0905-7188
Status: Published / Disseminated
Refereed: Yes
URI: http://nectar.northampton.ac.uk/id/eprint/12837

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