Effect of Whole-Body Vibration Training on Muscle Activation for Individuals with Knee Osteoarthritis

Table 3

Main effects of frequency on the EMG%_MVC of VL, RF, S, and BF.

Muscle	Frequency		95% CI			Partial
VL	0 Hz		20.2-2.3	2.151	0.150	0.048
	5 Hz		21.3-30.3
	10 Hz		17.5-24.2
	20 Hz		22.3-8.2
RF	0 Hz		11.0-16.7	22.572	<0.001	0.344
	5 Hz		11.8-17.8
	10 Hz		13.0-19.1
	20 Hz		19.2-27.3
S	0 Hz		4.3-7.6	16.077	<0.001	0.272
	5 Hz		6.5-9.7
	10 Hz		6.5-11.2
	20 Hz		11.0-17.8
BF	0 Hz		7.7-12.3	8.573	0.002	0.048
	5 Hz		8.3-12.9
	10 Hz		8.9-13.4
	20 Hz		11.5-16.4

Abbreviations: EMG%_MVC: muscle activation rate; VL: vastus lateralis; RF: rectus femoris; S: semitendinosus; BF: biceps femoris; CI: confidence interval.