Active versus local vibration warm-up effects on knee extensors stiffness and neuromuscular performance of healthy young males. Issue 2 (February 2019)

• Record Type: Journal Article
• Authors: Souron, Robin; Zambelli, Alessandro; Espeit, Loïc; Besson, Thibault; Cochrane, Darryl J.; Lapole, Thomas
• Is Part Of: Journal of science and medicine in sport. Volume 22:Issue 2(2019)
• Page Start: 206
• Page End: 211
• Publication Date: 2019-02
• Subjects: CMJ counter movement jump -- EMG electromyography -- LV local vibration -- Mmax maximal M-wave recorded on relaxed muscles -- MVC maximal voluntary contraction -- PNS peripheral nerve stimulation -- RFD rate of force developement -- RMS root mean square -- SJ squat jump -- VA voluntary activation -- VJ vertical jump -- VL vastus lateralis -- VM vastus medialis; Active warm-up -- Local-vibration warm-up -- Passive stiffness -- Supersonic shear imaging -- Muscle performance; Sports sciences -- Periodicals; Sports medicine -- Periodicals; Exercise -- Physiological aspects -- Periodicals; Sports -- physiology -- Periodicals; Sports Medicine -- Periodicals; Sportgeneeskunde; 617.102705
• DOI: 10.1016/j.jsams.2018.07.003
• Languages: English
• ISSNs: 1440-2440

Abstract

Abstract: Objectives: To compare the effects of local-vibration and active warm-up on knee extensors muscle stiffness and neuromuscular performance. Design: Experimental crossover study. Methods: Thirteen participants performed three 15-min warm-up protocols of control (CON), active (ACT) and local-vibration (LV) in separate testing session. Passive stiffness of vastus lateralis (VL) and vastus medialis (VM) by shear wave elastography and neuromuscular performance were assessed before and 2-min after each condition. Results: A decrease in muscle stiffness was reported after ACT for VL (−16.0 ± 6.6%; p < 0.001) and VM (−10.2 ± 8.7%; p = 0.03) while no changes were reported after CON (p = 0.46 and p = 0.34 for VL and VM, respectively) and LV (p = 0.07 and p = 0.46 for VL and VM, respectively). Maximal jump performances increased during squat (+8.5 ± 6.6%; p < 0.001) and countermovement jump (+5.2 ± 5.8%; p < 0.001) after ACT while no changes were reported after CON and LV during squat (p = 0.16 and p = 0.81, respectively) and countermovement jump (p = 0.18 and p = 0.31, respectively). We further report that each condition was ineffective to inducing changes in maximal voluntary isometric contraction force (p = 0.18), rate of force development (p = 0.92), twitch parameters (p > 0.05) as well as central modulations as reported by the unchanged voluntary activation level (p = 0.24) and maximal electromyography (EMG) recorded from the VL (p = 0.44). Conclusions: The active warm-up acutely reduced muscle stiffness and increased muscle performance during maximal dynamic tasks. With regard to LV, further studies are required to determine optimal parameters (frequency, amplitude, duration) to significantly increase muscle performance.