Chain-loaded variable resistance warm-up improves free-weight maximal back squat performance |
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| Authors: | Minas A Mina Anthony J Blazevich Giannis Giakas Laurent B Seitz Anthony D Kay |
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| Institution: | 1. Sport, Outdoor and Exercise Science, University of Derby, Buxton, UK;2. Centre for Exercise and Sports Science Research, School of Medical and Health Sciences, Edith Cowan University, Joondalup, Western Australia;3. Department of PE &4. Sport Science, University of Thessaly, Trikala, Greece;5. French Rugby League Academy, Toulouse, France;6. Sport, Exercise &7. Life Sciences, University of Northampton, Northampton, UK |
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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?p?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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| Keywords: | PAP accommodating resistance 1-RM preconditioning strength training |
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