Acute effects of partial-body vibration in sitting position

Table 1 Descriptive and inferential statistics

	STOCH (n = 25)		SIN (n = 25)
Variable	M	SD	M	SD	t	P
Sex (m, f)	7m, 18f		10m, 15f		-0.89	0.381
Age (yr)	25.12	2.89	25.40	4.38	0.27	0.791
BMI (kg/m²)	22.81	3.81	23.54	3.50	0.70	0.487
Sport (1 “rarely” - 6 “prof.”)	2.25	1.11	2.36	1.08	0.35	0.727
Smoking (s, ns)	7s, 18ns		8s, 17ns		0.30	0.763
Last time nicotine (h)	25.86	21.71	7.75	16.35	-1.84	0.089
Last time caffeine (h)	7.65	8.25	9.40	9.08	0.64	0.527
EMG ES (%MVC)	29.67	22.43	25.17	18.50	-0.77	0.443
HRV (RMSSD, ms)	35.21	16.77	35.69	19.52	0.09	0.926
Balance-test (cm)	73.34	8.23	77.77	6.75	2.08	0.043
Flexibility-test (cm)	-2.02	9.2	-2.01	9.54	0.001	0.999

EMG: Electromyography, muscular activation expressed as percentage of peak activation measured at maximal voluntary contraction (%MVC) of the lower back muscle erector spinae (ES); HRV: Heart rate variability was measured with the square root of the mean of the sum of the squares of the differences (RMSSD). Balance was measured using the modified star excursion balance test (mSEBT) and expressed in centimeter; Flexibility was assessed with the fingertip-to-floor method (mFTF) and expressed in centimeter.

Table 2 Results of t-tests for each training condition

	STOCH (n = 25)				SIN (n = 25)
	BL	T			BL	T
	mean ± SD	mean ± SD	t	P	mean ± SD	mean ± SD	t	P
EMG ES (%MVC)	29.67 ± 22.43	32.32 ± 24.03	-0.96	0.174	25.17 ± 18.50	26.07 ± 14.73	-0.51	0.307
HRV (RMSSD, msec)	35.21 ± 16.77	29.10 ± 12.64	2.89	0.004	35.69 ± 19.52	29.60 ± 12.90	2.55	0.009
Balance-test (cm)	73.34 ± 8.23	75.28 ± 9.35	-2.22	0.018	77.77 ± 6.75	77.82 ± 6.12	-0.09	0.466
Flexibility-test (cm)	-2.02 ± 9.20	-2.53 ± 9.08	2.65	0.007	-2.01 ± 9.54	-2.55 ± 9.75	1.41	0.086

Left: Stochastic resonance partial-body vibration (STOCH) at Baseline (BL) and Training condition (T); Right: Sinusoidal partial-body vibration (SIN) at BL and T; EMG: Electromyography, activation expressed as percentage of activation measured at maximal voluntary contraction (%MVC) of the lower back muscle erector spinae (ES); HRV: Heart rate variability was measured with the square root of the mean of the sum of the squares of the differences (RMSSD); Balance was measured using the modified star excursion balance test (mSEBT) and flexibility with fingertip-to-floor method (MFTF).