Acute effects of stochastic resonance whole body vibration

Table 1 Descriptive study results (mean ± SD)

	Baseline	Sham SR-WBV(2 Hz, noise level 0)	Verum SR-WBV(6 Hz, noise level 4)
EMG TD (%MVC)	3.43 ± 2.08	5.68 ± 2.78	9.14 ± 5.81
HRV (mean RMSSD, ms)	38.28 ± 19.76	28.07 ± 26.81	26.14 ± 17.38
Energy expenditure (kcal)	13.67 ± 3.41	18.52 ± 2.96	35.48 ± 5.69
Blood flow (perfusion units)
Neck	27.83 ± 9.22	27.86 ± 11.05	30.81 ± 20.62
Middle back	22.25 ± 6.04	26.33 ± 7.82	27.13 ± 12.45
Lower back	15.40 ± 5.15	14.92 ± 6.22	15.87 ± 6.04
Skin temp (°C)
Neck	34.48 ± 0.85	35.27 ± 1.04	35.65 ± 0.81
Middle back	33.95 ± 0.99	34.85 ± 1.30	35.19 ± 0.91
Lower back	33.90 ± 1.34	34.19 ± 1.35	34.25 ± 1.32
Skin redness (colour unit)
Neck	8.56 ± 2.37	8.83 ± 2.75	8.91 ± 2.58
Middle back	6.39 ± 1.63	7.20 ± 2.03	7.25 ± 2.27
Lower back	6.55 ± 1.74	6.34 ± 1.61	6.41 ± 1.94
CPG pain	1.52 ± 0.75	1.33 ± 0.58	1.33 ± 0.91
Stiffness	2.52 ± 2.16	1.95 ± 1.72	1.76 ± 1.67
Well-being	8.10 ± 1.34	8.24 ± 1.04	8.14 ± 1.71
Muscle relaxation	6.67 ± 1.74	7.24 ± 1.95	8.38 ± 0.97

EMG: Electromyography, activation expressed as percentage of activation measured at maximal voluntary contraction (%MVC) of the decending part of the trapezius muscle (TD); RMSSD: Root of the mean of the sum of the squares of the differences; HRV: Heart rate variability; CPG: Chronic pain grade; SR-WBV: Stochastic resonance whole body vibration.