Original Article
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Acute unilateral leg vibration exercise improves contralateral neuromuscular performance
P.J. Marín1, T.J. Hazell2, M.T. García-Gutiérrez1, D.J. Cochrane3
1.
Laboratory of Physiology, European University Miguel de Cervantes, Valladolid, Spain
2.
Department of Kinesiology and Physical Education, University of Lethbridge, Lethbridge, Alberta
3.
School of Sport & Exercise, Massey University, Palmerston North, New Zealand
Abstract
Objectives: To examine the post-exercise cross-transfer effects of acute whole body vibration (WBV). Methods: Seventeen healthy male volunteers (20.8±1.2 y) performed three unilateral vibration conditions in a randomized order: 1) WBV-50 Hz [high amplitude]; 2) WBV-30 Hz [low amplitude]; and 3) a control no WBV condition (Sham) applied to the dominant leg. Each condition involved maximal voluntary isometric contractions (MVC) followed by three leg press explosive repetitions (40% MVC) with non-dominant and dominant legs; which were conducted prior to and post vibration (immediately; 2 min and 5 min). Surface electromyography (sEMG) of the vastus lateralis (VL) and medial gastrocnemius (MG) were measured throughout each condition. Results: A condition x leg x time interaction effect was detected (p=0.001) where 50 Hz-High in the stimulated leg enhanced mean velocity at post-2 min compared to 30 Hz-Low and Sham, remaining elevated at post-5 min. Similarly, 50 Hz-High in the non-stimulated leg increased mean velocity at post-immediately and post-2 min compared to 30 Hz-Low and Sham. There were no changes in sEMG of VL and GM in the stimulated and non-stimulated post-conditions. Conclusion: WBV (50 Hz) can augment cross-transfer in neuromuscular performance. WBV could provide an alternate method of unilateral training to promote cross education explosive strength.
Keywords
Sinusoidal Vibration Sinusoidal Vibration Electromyography Electromyography Power Power Vibration Exercise Vibration Exercise Cross-education Cross-education
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