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Open AccessArticle

Effect of Descent Velocity upon Muscle Activation and Performance in Two-Legged Free Weight Back Squats

Department of Sport Sciences and Physical Education, Nord University, 7600 Levanger, Norway
Sports 2019, 7(1), 15; https://doi.org/10.3390/sports7010015
Received: 13 December 2018 / Revised: 30 December 2018 / Accepted: 3 January 2019 / Published: 7 January 2019
Background: The aim of this study was to investigate the effect of descent velocity during two-legged full back squats upon muscle activation and squat ascent performance. Methods: Eleven healthy resistance-training males (age: 24 ± 6 years, body mass: 89.5 ± 21.5 kg, height: 1.84 ± 0.10 m) performed 4-repetition maximum (4-RM) two-legged full squats with slow, normal, and fast descent phases. Kinematics and muscle activity of ten muscles divided into five regions were measured. Results: The main findings were that maximal and minimal velocity were lower and maximal velocity occurred later in the slow condition, while there was no difference in second peak velocity or ascent displacement when compared with the normal and fast conditions. Furthermore, no differences in muscle activation were found as an effect of the descent velocity. Conclusion: It was concluded that the slow descent velocity had a negative effect upon the ascent phase, because of the lower peak velocity and peak force increasing the chance of failure. The lower velocities were not caused by lower pre-activation of the muscles but were probably a result of potentiation and/or utilization of stored elastic energy and/or the stretch reflex. View Full-Text
Keywords: sticking point; sticking region; EMG sticking point; sticking region; EMG
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Van den Tillaar, R. Effect of Descent Velocity upon Muscle Activation and Performance in Two-Legged Free Weight Back Squats. Sports 2019, 7, 15.

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