Abstract
This study assessed the feasibility of stochastic resonance whole-body vibration (SR-WBV) training and its impact on isometric maximal voluntary contraction (IMVC), isometric rate of force development (IRFD) and a drop jump test (DJ) in healthy female students. Twelve participants were randomised to static squats during SR-WBV 6 Hz, noise level 4, over 4 weeks or to a control group (no training). Feasibility outcomes included the number of students agreeing to participate, the number of drop-outs, the adherence to the SR-WBV and the evaluation of the protocol. Secondary outcomes were IMVC, IRFD and DJ. Results: Among 35 eligible students, 12 agreed to participate and two dropped out. The adherence was 41 of 60 possible sessions. There were moderate to large, but statistically non-significant, gains in the secondary outcomes. Conclusion: These results suggest that such a study would be feasible although with some modifications such as a better familiarisation to the DJ.
Highlights
The literature shows moderate evidence that whole-body vibration (WBV) improves strength and power in healthy persons or in patients
This study assessed the feasibility of stochastic resonance whole-body vibration (SR-WBV) training and its impact on isometric maximal voluntary contraction (IMVC), isometric rate of force development (IRFD) and a drop jump test (DJ) in healthy female students
The remaining four candidates were sick or injured, resulting in 12 students that were eligible to participate and that consented to participate in this feasibility study
Summary
The literature shows moderate evidence that whole-body vibration (WBV) improves strength and power in healthy persons or in patients. During S-WBV the device vibrates vertically or side alternating with frequencies from 20 to 50 Hz and amplitudes from 2 to 6 mm (Cochrane, 2011). During SR-WBV, participants stand on two platforms that vibrate independently between 1 and 12 Hz and (Rogan, Radlinger, et al, 2012). Some studies showed positive effects after S-WBV on muscle strength (Marin & Rhea, 2010a, 2010b). Improvements on strength and power can be reached within a short time frame (Cardinale & Bosco, 2003; Rogan & Hilfiker, 2012). The vibration stimuli produce small changes in the muscletendon complex (Cochrane, Loram, Stannard, & Rittweger, 2009), activate the muscle spindles with stimulation of the Ia-afferents, facilitating the alpha motor neuron output and contracting the extrafusal muscle fibres (Roelants, Delecluse, Goris, & Verschueren, 2004)
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