Table 1.

Participant Demographics

	Middle-Aged, Healthy	Older, Healthy	Older, Mobility Limited
Age (y)
M ± SD	47.5 ± 4.6	73.9 ± 3.5*	77.4 ± 4.8*
Range	41–55	70–82	70–85
Weight (kg)
M ± SD	75.9 ± 14.9	75.0 ± 16.2	71.6 ± 10.0
Range	54.5–115.5	47.4–104.6	50.2–95.5
Body mass index (kg/m2)
M ± SD	25.9 ± 3.0	25.1 ± 3.9	26.6 ± 2.9
Range	19.7–32.6	18.7–33.0	22.6–31.1
Short Physical Performance Battery (out of 12)
M ± SD	11.7 ± 0.5	11.0 ± 0.9	7.9 ± 1.3†
Range	11–12	10–12	5–9
Sex
Male/female	12/12	14/11	11/12

^*Different from middle-aged healthy adults (p < .001).

^†Different from middle-aged healthy adults and older healthy adults (p < .001).