Table 2.

Body and muscle mass characteristics

Parameters	SF	HC	VC
Preflight body mass, g	26.8 ± 0.5	27.8 ± 1.4	28.0 ± 0.5
Postflight body mass, g	29.4 ± 1.7	30.7 ± 0.7	28.7 ± 0.5
Soleus muscle, mg	7.2 ± 0.3*	10.2 ± 0.4	9.6 ± 0.4
Gastrocnemius muscle, mg	119 ± 5*	157 ± 4	156 ± 3
Soleus muscle mass-to-body mass ratio, mg/g	0.25 ± 0.01*	0.34 ± 0.01	0.33 ± 0.01
Gastrocnemius muscle mass-to-body mass ratio, mg/g	4.09 ± 0.15*	5.29 ± 0.13	5.44 ± 0.12

Values are means ± SE for spaceflight (SF, n = 6) habitat control (HC, n = 6) and vivarium control (VC, n = 16) mice; n equals the number of animals studied.

^*SF group mean different from both HC and VC group means (P < 0.05, one-way ANOVA with Bonferroni post hoc test).