Influence of variable resistance loading on subsequent free weight maximal back squat performance.

Journal article


Mina, M., Blazevich, Anthony J., Giakas, Giannis and Kay, Anthony D. 2014. Influence of variable resistance loading on subsequent free weight maximal back squat performance. Journal of Strength and Conditioning Research. https://doi.org/10.1519/JSC.0000000000000471
AuthorsMina, M., Blazevich, Anthony J., Giakas, Giannis and Kay, Anthony D.
Abstract

The purpose of the study was to determine the potentiating effects of variable resistance (VR) exercise during a warm-up on subsequent free-weight resistance (FWR) maximal squat performance. In the first session, 16 recreationally active men (age = 26.0 ± 7.8 years; height = 1.7 ± 0.2 m; mass = 82.6 ± 12.7 kg) were familiarized with the experimental protocols and tested for 1 repetition maximum (1RM) squat lift. The subjects then visited the laboratory on 2 further occasions under either control or experimental conditions. During these conditions, 2 sets of 3 repetitions of either FWR (control) or VR (experimental) squat lifts at 85% of 1RM were performed; during the experimental condition, 35% of the load was generated from band tension. After a 5-minute rest, 1RM, 3D knee joint kinematics, and vastus medialis, vastus lateralis, rectus femoris, and semitendinosus electromyogram (EMG) signals were recorded simultaneously. No subject increased 1RM after FWR, however, 13 of 16 (81%) subjects increased 1RM after VR (mean = 7.7%; p < 0.01). Lower peak and mean eccentric (16-19%; p ≤ 0.05) and concentric (12-21%; p ≤ 0.05) knee angular velocities were observed during the 1RM following VR when compared with FWR, however, no differences in knee flexion angle (1.8°; p > 0.05) or EMG amplitudes (mean = 5.9%; p > 0.05) occurred. Preconditioning using VR significantly increased 1RM without detectable changes in knee extensor muscle activity or knee flexion angle, although eccentric and concentric velocities were reduced. Thus, VR seems to potentiate the neuromuscular system to enhance subsequent maximal lifting performance. Athletes could thus use VR during warm-up routines to maximize squat performance.

KeywordsElastic bands; Postactivation potentiation; Preconditioning; Strength training; Sport science
Year2014
JournalJournal of Strength and Conditioning Research
PublisherNational Strength and Conditioning Association
ISSN10648011
Digital Object Identifier (DOI)https://doi.org/10.1519/JSC.0000000000000471
Web address (URL)http://hdl.handle.net/10545/621963
hdl:10545/621963
Publication datesOct 2014
Publication process dates
Deposited24 Nov 2017, 12:07
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Archived with thanks to Journal of Strength and Conditioning Research

ContributorsUniversity of Derby, Edith Cowan University, University of Thessaly and University of Northampton
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