Mechanisms of quadriceps muscle weakness in knee joint osteoarthritis: the effects of prolonged vibration on torque and muscle activation in osteoarthritic and healthy control subjects

Table 2 Summary of dependent variables pre and post vibration in each group

Dependent variable	Group	Pre vibration	Post vibration	Change (%)
Quadriceps PT*	OA	128 ± 49	124 ± 44	-2.4
	Control	170 ± 59	156 ± 55	-8.2**
Vastus medialis RMS*	OA	0.13 ± 0.06	0.13 ± 0.06	1.4
	Control	0.27 ± 0.19	0.24 ± 0.18	-13.3**
Vastus lateralis RMS*	OA	0.13 ± 0.06	0.13 ± 0.06	3.9
	Control	0.22 ± 0.13	0.19 ± 0.13	-14.1**
Hamstrings PT	OA	48 ± 18	49 ± 16	1.7
	Control	56 ± 19	55 ± 19	-0.4
Semitendinosus RMS	OA	0.17 ± 0.09	0.18 ± 0.10	7.1
	Control	0.22 ± 0.12	0.23 ± 0.15	3.8
Biceps femoris RMS	OA	0.12 ± 0.10	0.10 ± 0.08	-2.5
	Control	0.16 ± 0.07	0.16 ± 0.07	2.6

Data presented as mean ± standard deviation. OA, osteoarthritis; PT, peak torque (Nm); RMS, root mean square of electromyographic signals. *Significant difference between groups (P < 0.05). **Significant change from zero (P < 0.05).

ISSN: 1478-6362