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    SubjectsAccomodating resistance (1)Post-activation potentiation (PAP) (1)Preconditioning (1)Sport science (1)Strength training (1)View MoreJournal
    European Journal of Sport Science (1)
    AuthorsBlazevich, Anthony J. (1)Giakas, Giannis (1)Kay, Anthony D. (1)Mina, Minas A. (1)Mina, Minas A. (1) ccView MoreYear (Issue Date)
    2016-07-18 (1)
    TypesArticle (1)

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

    Mina, Minas A.; Blazevich, Anthony J.; Giakas, Giannis; Seitz, Laurent B.; Kay, Anthony D. (Taylor and Francis, 2016-07-18)
    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.
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