Size and Proportions of Slow-Twitch and Fast-Twitch Muscle Fibers in Human Costal Diaphragm

Table 1

Mean minimal fiber diameter, mean fiber cross-sectional area, and numerical proportion of slow-twitch, fast-twitch, and hybrid fibers of the right and left side of costal diaphragm.

Parameter	R slow	L slow	R fast	L fast	R hybrid	L hybrid
Diameter [µm]
CSA [µm^2]
Numerical proportion [%]

Values are means ± SE. CSA = cross-sectional area; R = right side of costal diaphragm; L = left side of costal diaphragm; slow = slow-twitch fibers; fast = fast-twitch fibers; hybrid = hybrid fibers; ( in all, minimal = 0.180, and maximal = 0.974).