Effect of Core Stability Training Monitored by Rehabilitative Ultrasound Image and Surface Electromyogram in Local Core Muscles of Healthy People

Table 2

Comparison of the muscle thickness activation ratio of TrA between the monitoring group and control group in 0, 4, and 8 weeks (mean ± SD).

		Monitoring group	Control group	Between-group value
Left	Baseline	1.44 ± 0.05	1.42 ± 0.05	0.251
	4 weeks	1.60 ± 0.03	1.50 ± 0.07	≤0.001
	8 weeks	1.67 ± 0.05	1.56 ± 0.04	≤0.001
Intragroup value (baseline vs 8 weeks)		≤0.001	≤0.001
Mauchly’s sphericity test W = 0.970 ()
Right	Baseline	1.45 ± 0.07	1.44 ± 0.07	0.552
	4 weeks	1.60 ± 0.04	1.55 ± 0.04	≤0.001
	8 weeks	1.67 ± 0.06	1.58 ± 0.06	≤0.001
Intragroup value (baseline vs 8 weeks)		≤0.001	≤0.001
Mauchly’s sphericity test W = 0.939 ()

Activation ratio = contraction thickness/relax thickness. Compared with baseline, .