Table 7.

Mean of four times measurements ± standard deviation of %MVC

		The amount of muscle activity (%MVC) [%]
Condition	Muscle	Subject 1	Subject 2	Subject 3	Subject 4	Subject 5	Average
Without headrest	Left	30.2 ± 3.58	33.6 ± 2.33	19.5 ± 1.55	22.6 ± 3.54	39.9 ± 1.59	29.16
	Right	27.0 ± 4.06	25.6 ± 3.38	21.5 ± 2.96	18.7 ± 2.03	32.4 ± 3.47	25.02
With headrest	Left	26.7 ± 0.67	33.8 ± 2.57	16.8 ± 3.90	25.6 ± 0.50	26.7 ± 5.20	25.89
	Right	24.3 ± 1.81	24.3 ± 4.25	16.2 ± 2.57	16.8 ± 2.42	21.4 ± 2.24	20.58