. Author manuscript; available in PMC: 2023 Apr 4.

Published in final edited form as: J Neurol Sci. 2007 Nov 19;267(1-2):137–141. doi: 10.1016/j.jns.2007.10.019

Table 1.

Measurement of total, type I and type II fibers in the three muscle biopsies

Age (years)	2		5		12
Age (years)		%		%		%
Total fibers	145.0	100	190.0	100	101.0	100
Type I	97.0	66.9	170.0	89.5	78.0	72.3
Type II	48.0	33.1	20.0	10.5	23.0	22.7
Ratio I:II	2.02		8.5		3.4
Average area (μm)	1614.43		1668.16		5150.98
Average minor ∅ (μm)	37.66		34.59		63.31
Fiber ∅ (Mm) from controls^a	17.5		24		49.5

Mean fiber diameters for normal children biopsied at different ages (from Muscle Biopsy: A modern approach. Dubowith and Brooke 1973 W. B. Saunders Company Ltd. London, 4, 100).