. Author manuscript; available in PMC: 2016 Jul 1.

Published in final edited form as: Muscle Nerve. 2015 Jun 1;52(1):76–82. doi: 10.1002/mus.24641

Table 1.

Fiber type specific cross-sectional area of the diaphragm muscle of young and old mice

	Young	Old
Type I	477.5 ± 62.1	530.2 ± 66.3
Type IIa	520.3 ± 62.1	542.8 ± 66.3
Type IIx and/or IIb^*,^†	877.9 ± 62.1	781.4 ± 66.3

The DIAm cross-sectional area (µm²), data was analyzed by the mean of the mean with the individual animal as a random effect (age × fiber type × animal; main effect of age P=0.893, main effect of fiber type P<0.001, interaction P=0.477), data presented as least squared mean ± standard error.

significantly different from Type I fibers;

^†

significantly different from type IIa fibers, main effect