Table 1.

Activity ratio of GS and GP.

	6-mo		24-mo
	Soleus	Tibialis	Soleus	Tibialis
Glycogen synthase activity ratio (−G6P/+G6P)
Diet
AL	0.24 ± 0.02	0.28 ± 0.02	0.12 ± 0.02**	0.23 ± 0.01
ALF	0.16 ± 0.01†	0.32 ± 0.02	0.11 ± 0.01	0.23 ± 0.03*
CR	0.20 ± 0.03	0.27 ± 0.02	0.17 ± 0.01	0.27 ± 0.01
Glycogen phosphorylase activity ratio (−AMP/+AMP)
Diet
AL	0.69 ± 0.08	0.84 ± 0.04	0.58 ± 0.03	0.66 ± 0.09
ALF	0.74 ± 0.02	0.85 ± 0.03	0.65 ± 0.07	0.65 ± 0.06
CR	0.71 ± 0.05	0.85 ± 0.03	0.59 ± 0.06	0.79 ± 0.15

Enzyme activities were assessed in extracts from SOL and TA muscles and expressed as the activity ratio. Means ± SEM from at least 5 rats in each group are shown. Age influenced: GS activity ratio (F 17.4, p < 0.001) in SOL and (F 8.40, p < 0.01) in TA and GP activity ratio (F 11.3, p < 0.005) in TA. Diet influenced: GS activity ratio (F 5.57, p < 0.01) in SOL. The significance of the differences is: versus AL within same muscle and age ^†p < 0.05; versus 6-mo rats comparing equivalent diet and muscle *p < 0.05 and **p < 0.001.