Table 2. Muscle activity changes in response to external fixation

%MVIC (%)	NONE	FP	t	p	Effect size
Rt.MF	28.80±10.59	23.36±10.75	5.002	<0.001*	0.51
Lt.MF	25.67±12.16	18.47±11.16	4.838	<0.001*	0.62
GM	21.92±7.68	27.45±6.23	–4.767	<0.001*	0.79
BF	9.68±6.26	9.31±4.50	0.652	0.525	0.07

MVIC, Maximum voluntary isometric contraction; Rt.MF, right multifidus; Lt.MF, left multifidus; GM, gluteus maximus; BF, biceps femoris; NONE, no fixation; FP, fixation on pelvic.
Data are expressed as mean±SD.
p<0.05.