TABLE 1.

Correlation coefficients between relative changes in upper trapezius muscle dynamic stiffness measured by myotonometry, elastic modulus measured by shear-wave elastography and muscle thickness measured by ultrasonography, respectively.

Point	Mean ± SD		Mean ± SD		Mean ± SD		Correlation coefficients
	Dynamic stiffness (N/m)		Elastic modulus (kPa)		Thickness (mm)		Δ Dynamic stiffness (%) / Δ elastic modulus (%)		Δ Dynamic stiffness (%) / Δ thickness (%)		Δ Elastic modulus (%) / Δ thickness (%)
	Before	24 h after ECC	Before	24 h after ECC	Before	24 h after ECC	R	p	R	p	R	p
1	309.29 ± 42.83	268.64 ± 17.72	41.96 ± 10.67	38.82 ± 11.40	5.60 ± 1.84	6.11 ± 1.96	0.08	0.78	−0.08	0.79	−0.26	0.38
2	327.07 ± 63.95	260.64 ± 31.55	47.83 ± 9.13	46.19 ± 5.99	7.19 ± 1.38	7.50 ± 1.46	−0.14	0.64	0.42	0.14	0.04	0.90
3	373.71 ± 68.79	248.64 ± 25.38	41.69 ± 9.61	40.74 ± 10.84	7.53 ± 1.42	7.87 ± 1.44	−0.25	0.39	0.14	0.63	0.08	0.79
4	500.43 ± 65.22	424.36 ± 83.24	42.47 ± 10.85	40.60 ± 13.11	7.33 ± 1.88	7.67 ± 1.63	0.50	0.07	−0.44	0.11	−0.10	0.73