Table 1.

Group characteristics

	Young (n = 20)	Older Healthy (n = 18)	Older Impaired (n = 9)
Age, yr	23.5 ± 0.53	73.2 ± 1.3*	74.0 ± 1.4*
Height, m	1.6 ± 0.05	1.7 ± 0.02	1.6 ± 0.03
Body mass, kg	66.8 ± 2.6	74.5 ± 2.4	75.8 ± 3.5
Physical activity, counts·day−1·1000−1	212.2 ± 17.6	234.1 ± 24.0	108.5 ± 13.2*‡

Data are expressed as means ± SE for each group.

^*Significantly different from young (P ≤ 0.02).

^‡Significantly different from older healthy (P ≤ 0.02).