Table 1.
Quantitative morphology for the composition of muscles of control and Snell dwarf mice exposed to plantarflexion SSC training
| Nontrained | Plantarflexion SSC‐trained | |
|---|---|---|
| GTN | ||
| Control | ||
| Nondegenerative muscle fibers (%) | 90.8 ± 0.8 | 89.3 ± 1.0 |
| Degenerative muscle fibers (%) | 0.0 ± 0.0 | 0.0 ± 0.0 |
| Noncellular interstitium (%) | 8.8 ± 0.8 | 10.1 ± 1.0 |
| Cellular interstitium (%) | 0.4 ± 0.1 | 0.6 ± 0.2 |
| Centrally nucleated fibers (%) | 1.5 ± 0.5 | 6.0 ± 1.9 |
| Snell | ||
| Nondegenerative muscle fibers (%) | 89.7 ± 0.8 | 73.2 ± 6.7a, b |
| Degenerative muscle fibers (%) | 0.0 ± 0.0 | 0.1 ± 0.1 |
| Noncellular interstitium (%) | 9.6 ± 0.8 | 22.1 ± 5.3a, b |
| Cellular interstitium (%) | 0.7 ± 0.1 | 4.6 ± 1.5a, b |
| Centrally nucleated fibers (%) | 1.3 ± 0.4 | 36.0 ± 4.8a, b |
| TA | ||
| Control | ||
| Nondegenerative muscle fibers (%) | 92.4 ± 0.5 | 90.3 ± 0.9 |
| Degenerative muscle fibers (%) | 0.0 ± 0.0 | 0.0 ± 0.0 |
| Noncellular interstitium (%) | 7.1 ± 0.4 | 8.7 ± 0.8 |
| Cellular interstitium (%) | 0.5 ± 0.2 | 1.0 ± 0.1 |
| Centrally nucleated fibers (%) | 2.2 ± 0.7 | 8.5 ± 3.5 |
| Snell | ||
| Nondegenerative muscle fibers (%) | 90.6 ± 0.8 | 87.4 ± 0.9a, b |
| Degenerative muscle fibers (%) | 0.0 ± 0.0 | 0.0 ± 0.0 |
| Noncellular interstitium (%) | 8.2 ± 1.1 | 11.0 ± 0.9a, b |
| Cellular interstitium (%) | 1.1 ± 0.1 | 1.6 ± 0.3a, b |
| Centrally nucleated fibers (%) | 1.3 ± 0.4 | 23.1 ± 8.9a, b |
Values are means ± SE. Percentage refers to percentage of tissue. Sample sizes were N = 5 to 6 per group.
a
Different from nontrained muscle.
b
Different from control muscle, p < 0.05.