Table 4.

Associations between measures of muscle quality, physical performance and mobility.

		Grip	Adj. Grip	60°/s Knee Ext.	Adj. 60°/s Knee Ext.	180°/s Knee Ext.	Adj. 180°/s Knee Ext.
Echogenicity a	r	−0.41	−0.50	−0.38	−0.47	−0.41	−0.49
	p-value	0.026 *	0.005 *	0.038 *	0.008 *	0.025 *	0.006 *
IMAT b	r	−0.13	−0.45	−0.14	−0.34	−0.21	−0.40
	p-value	0.496	0.013 *	0.476	0.069	0.275	0.029 *
Subcutaneous fat b	r	0.12	−0.16	0.14	−0.02	0.06	−0.10
	p-value	0.519	0.388	0.451	0.909	0.760	0.612
Total body fat c	r	0.05	−0.31	0.20	−0.02	0.12	−0.07
	p-value	0.809	0.091	0.285	0.921	0.527	0.709
Lean body mass d	r	0.50	0.00	0.53	0.24	0.49	0.21
	p-value	0.005 *	0.992	0.002 *	0.198	0.006 *	0.274

¹ All strength values reported for the dominant limb with the adjusted values scaled for body weight; * p < 0.05. IMAT, intra- and intermuscular adipose tissue; Adj., adjusted; Ext., extensors. ^a Echogenicity obtained from the rectus femoris of the dominant limb and measured via grayscale histogram analysis. ^b IMAT and subcutaneous fat values derived from computed tomography attenuation at the mid-thigh of the dominant limb; log transformed data used in the analysis. ^c Total body fat estimated using dual-energy X-ray absorptiometry (DXA). ^d Lean body mass is appendicular lean mass scaled to height (aLM/ht²).