Table 1.

Body mass and hind limb muscle masses

	Body mass	Muscle mass (mg)
	(g)	EDL	SOL	ATB	GTN	PLN	FDL	BFM	VLT	VMD
Male mice
Cage sedentary	31.9	11.6	10.2	53.3	153.2	20.2	32.8	170.7	102.3	94.7
(Sed)	± 0.7	± 0.2	± 0.2	± 0.7	± 2.4	± 0.4	± 0.4	± 2.7	± 1.4	± 1.3
Exercised	28.5	10.9	10.4	50.1	135.8	18.4	30.4	151.0	94.9	88.1
(Exer)	± 0.7*	± 0.3*	± 0.4	± 1.2*	± 2.5*	± 0.4*	± 0.8*	± 4.3*	± 2.3*	± 2.3*
Female mice
Cage sedentary	24.1	8.7	7.9	39.3	112.0	13.6	23.7	128.7	77.3	68.8
(Sed)	± 0.4	± 0.2	± 0.1	± 0.5	± 1.6	± 0.3	± 0.4	± 1.8	± 1.0	± 0.9
Exercised	22.3	8.1	7.8	36.2	99.2	12.1	22.0	114.4	72.5	62.9
(Exer)	± 0.6	± 0.2*	± 0.3	± 1.0*	± 2.6*	± 0.4*	± 0.7*	± 3.3*	± 2.4*	± 1.8*

Body masses in grams and muscle masses in milligrams are given as means ±s.e.m. for cage sedentary (Sed) mice and for mice that completed 8 weeks of 5 days per week treadmill running exercise (Exer). Muscles are the extensor digitorum longus (EDL), soleus (SOL), tibialis anterior (ATB), gastrocnemius (GTN), plantaris (PLN), flexor digitorum longus (FDL), biceps femoris (BFM), vastus lateralis (VLT) and vastus medialis (VMD). In all cases, values were significantly (P < 0.05) larger for male compared with female mice within an experimental group.

^*indicates significant difference from cage sedentary mice of the same gender by Tukey post hoc pair-wise multiple comparison.