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.
| Parameter | DIA slow | VL slow | DIA fast | VL fast | DIA hybrid | VL hybrid |
|---|---|---|---|---|---|---|
| Diameter [µm] CV [%] |
46.8 ± 1.2∗
10.5 |
72.2 ± 3.1∗
17.2 |
45.1 ± 1.2∗
10.4 |
62.4 ± 3.0∗
19.3 |
47.3 ± 1.8∗∗
15.0 |
65.0 ± 4.7∗∗
27.0 |
| CSA [µm2] CV [%] |
2376.0 ± 115.9∗
19.5 |
5455.2 ± 428.0∗
31.4 |
2258.7 ± 110.6∗
19.4 |
4189.7 ± 362.5∗
34.6 |
2404.44 ± 151.4∗∗
25.2 |
4776.32 ± 618.8∗∗
48.5 |
| Numerical proportion [%] CV [%] |
50.2 ± 1.5∗
11.6 |
36.3 ± 3.7∗
41.0 |
47.2 ± 1.3∗
10.9 |
58.7 ± 3.9∗
26.7 |
2.6 ± 0.8 122.5 |
5.0 ± 1.1 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; N = 16 (∗ p < 0.001; ∗∗ p < 0.01).