Table 1 The mean thicknesses of four muscles in the relaxed and contracted states (Unit: centimeter), 95 % confidence interval (CI) in Resting state and Contracted state, the related C/R ratio, and the p value in differences between the relaxed and contracted states for the four muscles

Resting state

1.32 ± 0.27

1.37 ± 0.31

1.38 ± 0.32

1.30 ± 0.32

2.33 ± 0.51

2.34 ± 0.49

1.88 ± 0.41

1.98 ± 0.40

Contracted state

1.60 ± 0.30

1.68 ± 0.38

1.62 ± 0.40

1.55 ± 0.41

3.20 ± 0.61

3.26 ± 0.68

2.34 ± 0.49

2.44 ± 0.56

95 % CI in Resting state

1.24 ~ 1.39

1.29 ~ 2.46

1.29 ~ 1.47

1.21 ~ 1.39

2.19 ~ 2.47

2.20 ~ 2.48

1.76 ~ 1.99

1.87 ~ 2.09

95 % CI in Contracted state

1.52 ~ 1.69

1.58 ~ 1.79

1.50 ~ 1.73

1.44 ~ 1.67

3.03 ~ 3.37

3.07 ~ 3.45

2.00 ~ 2.47

2.29 ~ 2.60

 C/R

1.23 ± 0.12

1.24 ± 0.15

1.17 ± 0.10

1.19 ± 0.11

1.39 ± 0.14

1.40 ± 0.16

1.25 ± 0.12

1.24 ± 0.14

F

26.49

21.14

10.71

11.54

62.17

62.11

26.34

23.63

P

< 0.001

< 0.001

= 0.001

= 0.001

< 0.001

< 0.001

< 0.001

< 0.001