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

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    Authors
    Mina, Minas A. cc
    Blazevich, Anthony J.
    Giakas, Giannis
    Kay, Anthony D.
    Affiliation
    University of Derby
    Edith Cowan University
    University of Thessaly
    University of Northampton
    Issue Date
    2014-10
    
    Metadata
    Show full item record
    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.
    Citation
    Mina, M. A. et al (2014) 'Influence of Variable Resistance Loading on Subsequent Free Weight Maximal Back Squat Performance', Journal of Strength and Conditioning Research, 28 (10):2988.
    Publisher
    National Strength and Conditioning Association
    Journal
    Journal of Strength and Conditioning Research
    URI
    http://hdl.handle.net/10545/621963
    DOI
    10.1519/JSC.0000000000000471
    Additional Links
    http://content.wkhealth.com/linkback/openurl?sid=WKPTLP:landingpage&an=00124278-201410000-00037
    Type
    Article
    Language
    en
    ISSN
    10648011
    ae974a485f413a2113503eed53cd6c53
    10.1519/JSC.0000000000000471
    Scopus Count
    Collections
    School of Human Sciences

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