Fig. 1From: Effect of real-time ultrasound imaging for biofeedback on trunk muscle contraction in healthy subjects: a preliminary studyThickness of LM monitored under ultrasound. a Changes of the LM thickness of a subject in the Exp group, (b) changes of the LM thickness of a subject in the control group, and (c) changes of the LM thickness in the two groups over time. # Compared with the resting state, P < 0.05; * Compared with the control group, P < 0.05Back to article page