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    Chain-loaded variable resistance warm-up improves free-weight maximal back squat performance.

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    Authors
    Mina, Minas A. cc
    Blazevich, Anthony J.
    Giakas, Giannis
    Seitz, Laurent B.
    Kay, Anthony D.
    Affiliation
    University of Derby
    Edith Cowan University
    University of Thessaly
    French Rugby League Academy
    University of Northampton
    Issue Date
    2016-07-18
    
    Metadata
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    Abstract
    The acute influence of chain-loaded variable resistance exercise on subsequent free-weight one-repetition maximum (1-RM) back squat performance was examined in 16 recreationally active men. The participants performed either a free-weight resistance (FWR) or chain-loaded resistance (CLR) back squat warm-up at 85% 1-RM on two separate occasions. After a 5-min rest, the participants attempted a free-weight 1-RM back squat; if successful, subsequent 5% load additions were made until participants failed to complete the lift. During the 1-RM trials, 3D knee joint kinematics and knee extensor and flexor electromyograms (EMG) were recorded simultaneously. Significantly greater 1-RM (6.2 ± 5.0%; p < .01) and mean eccentric knee extensor EMG (32.2 ± 6.7%; p < .01) were found after the CLR warm-up compared to the FWR condition. However, no difference (p > .05) was found in concentric EMG, eccentric or concentric knee angular velocity, or peak knee flexion angle. Performing a CLR warm-up enhanced subsequent free-weight 1-RM performance without changes in knee flexion angle or eccentric and concentric knee angular velocities; thus a real 1-RM increase was achieved as the mechanics of the lift were not altered. These results are indicative of a potentiating effect of CLR in a warm-up, which may benefit athletes in tasks where high-level strength is required.
    Citation
    Mina, M. A. et al (2016) 'Chain-loaded variable resistance warm-up improves free-weight maximal back squat performance', European Journal of Sport Science, 16 (8):932
    Publisher
    Taylor and Francis
    Journal
    European Journal of Sport Science
    URI
    http://hdl.handle.net/10545/621966
    DOI
    10.1080/17461391.2016.1199740
    Additional Links
    https://www.tandfonline.com/doi/full/10.1080/17461391.2016.1199740
    https://pure.northampton.ac.uk/en/publications/chain-loaded-variable-resistance-warm-up-improves-free-weight-max
    Type
    Article
    Language
    en
    ISSN
    17461391
    EISSN
    15367290
    ae974a485f413a2113503eed53cd6c53
    10.1080/17461391.2016.1199740
    Scopus Count
    Collections
    School of Human Sciences

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