Title

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

Document Type

Journal Article

Publisher

Taylor and Francis

School

School of Medical and Health Sciences / Centre for Exercise and Sports Science Research

RAS ID

21750

Comments

Orignally published as :Mina, Minas A. (11.2016). "Chain-loaded variable resistance warm-up improves free-weight maximal back squat performance". European journal of sport science (1746-1391), 16 (8), p. 932-939. Article found here

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. © 2016 European College of Sport Science

DOI

10.1080/17461391.2016.1199740