Table 1.

Morphometric properties of experimental animals

Strain	Age, mo	N	Body Weight, g	EDL Weight, mg	EDL CSA, mm2	Lo, mm
BL10	6	10	32.03 ± 0.57	13.90 ± 0.77	2.12 ± 0.12	14.09 ± 0.04
	20	10	37.44 ± 0.64	13.00 ± 0.18	2.12 ± 0.03	13.14 ± 0.04
mdx	6	13	35.44 ± 0.42	16.73 ± 0.42†	2.57 ± 0.07†	13.93 ± 0.05
	20	19	31.12 ± 0.56*	15.95 ± 0.33†	2.42 ± 0.05†	14.13 ± 0.10†
ΔR2-15/ΔR18-23/ΔC	6	10	34.89 ± 1.74	13.34 ± 0.38	2.01 ± 0.06	13.17 ± 0.03
	20	9	41.92 ± 1.20a	12.49 ± 0.61	2.01 ± 0.10	13.32 ± 0.06
ΔR4-23/ΔC	6	10	32.33 ± 0.48	12.51 ± 0.41	1.99 ± 0.06	13.46 ± 0.03
	20	13	35.18 ± 1.24‡	12.12 ± 0.40	1.97 ± 0.06	13.19 ± 0.06
ΔH2-R15	6	9	32.51 ± 0.79	12.77 ± 0.22	2.08 ± 0.03	13.19 ± 0.04
	20	9	32.72 ± 1.40§	12.26 ± 0.28	1.94 ± 0.05	13.54 ± 0.09

Applicable values are means ± SE.

^*mdx mice are significantly different from age-matched BL10 mice.

^†mdx mice are significantly different from all other age-matched mouse strains.

^‡ΔR4-23/ΔC mice are significantly different from age-matched mdx mice.

^§ΔH2-R15 mice are significantly different from age-matched BL10 mice.

^aΔR2-15/ΔR18-23/ΔC mice are significantly different from all other age-matched mouse strains. EDL, extensor digitorum longus; CSA, cross-sectional area; Lo, optimal length.