Table 1.

Age, body and tissue masses of young and old B6D2F1 mice

	Young	Old
n	9	9
Age (months)	6.1 ± 0.4	29.6 ± 0.2*
BM (g)	37.9 ± 1.5	35.4 ± 0.8
WAT mass (g)	0.7 ± 0.1	0.4 ± 0.1*
WAT/BM (%)	1.8 ± 0.2	1.2 ± 0.4
Gast (g)	0.18 ± 0.01	0.13 ± 0.01*
Gast/BM (%)	0.49 ± 0.03	0.38 ± 0.03*
Heart mass (g)	0.17 ± 0.01	0.21 ± 0.01*
Heart/BM (%)	0.45 ± 0.02	0.57 ± 0.03*
Liver (g)	1.7 ± 0.1	2.0 ± 0.1*
Liver/BM (%)	4.6 ± 0.2	5.9 ± 0.2*

P ≤ 0.05, means ± s.e.m. Abbreviations: BM, body mass; Gast, gastrocnemius muscle mass; WAT, white adipose tissue.

^*Denotes difference from young.