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

Mina, M. A., Blazevich, A. J., Giannis, G., Seitz, L. B. and Kay, A. D. (2016) Chain-loaded variable resistance warm-up improves free-weight maximal back squat performance. European Journal of Sport Science. 16(8), pp. 932-939. 1746-1391.

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Item Type:	Article
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.
Uncontrolled Keywords:	1-RM, PAP, accommodating resistance, preconditioning, strength training
Creators:	Mina, Minas A, Blazevich, Anthony J, Giannis, Giakas, 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 November 2016
Date Type:	Publication
Page Range:	pp. 932-939
Journal or Publication Title:	European Journal of Sport Science
Volume:	16
Number:	8
Number of Pages:	8
Language:	English
DOI:	https://doi.org/10.1080/17461391.2016.1199740
ISSN:	1746-1391
Status:	Published / Disseminated
Refereed:	Yes
URI:	http://nectar.northampton.ac.uk/id/eprint/10558

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