Table 1.

Participant Characteristics

	MH	OH	OML
Age (yr)	47.2 ± 4.7	74.0 ± 3.6*	78.1 ± 4.5†
Weight (kg)	75 ± 14.1	71.4 ± 20.3	70.4 ± 11.1†
Height (cm)	170 ± 10.7	170.1 ± 10.8	163.3 ± 8.3†
Body mass index (kg/m2)	25.8 ± 3.1	25.3 ± 3.7	26.4 ± 3.1
SPPB score (out of 12)	11.7 ± 0.5	11.0 ± 0.9	7.9 ± 1.3†
Anterior compartment muscle CSA (cm2)	64.2 ± 15.0	52 ± 13.7*	44.2 ± 11.3†
Subcutaneous adipose tissue CSA (cm2)	63.9 ± 30.1	55.8 ± 30.0	66.8 ± 37.6
Sex (male/female)	14/15	16/12	15/17
Presence of knee osteoarthritis (self-report), %	0	7	16

Notes: All values are mean ± SD. CSA = cross-sectional area; MH = middle-aged healthy adults; OH = older healthy adults; OML = older adults with mobility limitation.

^*OH different from MH (p < .001).

^†OML different from MH and OH (p < .001).