The Associations between Pain Sensitivity and Knee Muscle Strength in Healthy Volunteers: A Cross-Sectional Study

Table 3

Correlation matrix between different measures of pain sensitivity at different assessment sites. Correlation coefficients (Pearson) at the top with the 𝑃 value below. Statistically significant correlation coefficients are marked with bold.

			Pressure pain thresholds				Saline-induced pain
			CCPA			CUFF	Max. intensity (mm)			Duration (s)
			VL	DELT	IPFP	LL	VL	DELT	IPFP	VL	DELT	IPFP
Pressure pain thresholds	CCPA	VL	1
			—
		DELT	0.88	1
			<0.0001	—
		IPFP	0.72	0.78	1
			<0.0001	<0.0001	—
	CUFF	LL	0.40	0.55	0.53	1
			0.04	0.003	0.004	—
Saline-induced pain	Max. Intensity (mm)	VL	−0.37	−0.37	−0.49	−0.49	1
			0.06	0.05	0.008	0.009	—
		DELT	−0.19	−0.21	−0.26	−0.55	0.76	1
			0.33	0.29	0.18	0.02	<0.0001	—
		IPFP	−0.54	−0.64	−0.61	−0.41	0.63	0.44	1
			0.003	0.0002	0.0006	0.03	0.0003	0.02	—
	Duration (s)	VL	−0.47	−0.53	−0.48	−0.40	0.52	0.28	0.41	1
			0.01	0.003	0.01	0.03	0.005	0.15	0.03	—
		DELT	−0.25	−0.23	−0.15	−0.16	0.16	0.29	0.15	0.39	1
			0.21	0.23	0.46	0.42	0.43	0.14	0.43	0.04	—
		IPFP	−0.60	−0.66	−0.56	−0.37	0.30	0.22	0.60	0.52	0.39	1
			0.0008	0.0001	0.002	0.055	0.12	0.26	0.0007	0.005	0.04	—

CCPA: computer-controlled pressure algometry. CUFF: computerized cuff algometry. VL: m. vastus lateralis.; DELT: m. deltoideus; IPFP: infrapatellar fat pad; LL: lower leg.