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Table 3 Correlation coefficients of thickness changes by 10N force in the anterior thigh to MVIC of knee extension

From: Prediction of the muscle strength by the muscle thickness and hardness using ultrasound muscle hardness meter

Variables	Male	Female
Thickness without force (mm)
Subcutaneous fat (F)	-0.018	-0.196
Rectus femoris muscle (R)	0.394**	0.237
Vastus intermedius muscle (V)	0.329**	0.135
Whole muscle (R+V)	0.412**	0.225
Whole tissue (F+R+V)	0.390**	0.139
Thickness with 10N force (mm)
Subcutaneous fat (F)	0.003	-0.185
Rectus femoris muscle (R)	0.415**	0.293
Vastus intermedius muscle (V)	0.315**	0.285
Whole muscle (R+V)	0.420**	0.362*
Whole tissue (F+R+V)	0.399**	0.251
Change ratio to 10N force (%) ¹⁾
Subcutaneous fat (F)	0.209	0.139
Rectus femoris muscle (R)	0.303**	0.275
Vastus intermedius muscle (V)	-0.053	0.314
Whole muscle (R+V)	0.233*	0.499**
Whole tissue (F+R+V)	0.211	0.400*

¹⁾ Percentage of thickness during force to that before force. *p<0.05, **p<0.01.

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