BioMed Research International

Research Article

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

Table 2

Comparison of costal diaphragm and vastus lateralis muscle with regard to mean fiber diameters, mean fiber cross-sectional areas, and mean numerical proportions of fiber types.
ParameterDIA slowVL slowDIA fastVL fastDIA hybridVL hybrid
Diameter [µm]
CV [%]		 
10.5		 
17.2		 
10.4		 
19.3		 
15.0		 
27.0
CSA [µm2]
CV [%]		 
19.5		 
31.4		 
19.4		 
34.6		 
25.2		 
48.5
Numerical proportion [%]
CV [%]		 
11.6		 
41.0		 
10.9		 
26.7		 
122.5		 
85.0
Values are means ± SE. CV = coefficient of variation; CSA = cross-sectional area; DIA = costal diaphragm; VL = vastus lateralis; slow = slow-twitch fibers; fast = fast-twitch fibers; hybrid = hybrid fibers; (; ).