Table 1.

Body weight (g) of the four groups of mice (n = 5 each) at baseline (Time 0) and 4 weeks later (Time 1).

Experimental time	MAS	MATT	OS	OTT
Time 0	41.8 ± 0.97	45.0 ± 0.89	39.8 ± 2.35	39.2 ± 0.73
Time 1	42.6 ± 0.68	43.0 ± 1.65	34.0 ± 1.60	37.2 ± 1.77

Means ± SEM. No significant difference was found at Time 1 vs. Time 0 in any group. MAS, middle-aged sedentary; MATT, middle-aged treadmill training, OS, old sedentary; OTT, old treadmill training.