Table 3.
Changes in muscle fibre characteristics in response to 12 weeks of combined exercise training in older men
| Type | Pre | Post | |
|---|---|---|---|
| Muscle fibre size (μm2) | I | 6399 ± 1804 | 7044 ± 1668 |
| II | 5073 ± 1496† | 5495 ± 1137† | |
| Myonuclear content (per fibre) | I | 3.84 ± 0.58 | 3.90 ± 0.60 |
| II | 3.46 ± 0.62† | 3.58 ± 0.60† | |
| Myonuclear domain (μm2) | I | 1641 ± 323 | 1804 ± 343 |
| II | 1455 ± 272† | 1554 ± 316† | |
| Satellite cell content (per fibre) | I | 0.092 ± 0.026 | 0.114 ± 0.041* |
| II | 0.061 ± 0.024† | 0.079 ± 0.025†* | |
| Satellite cell content (% total myonuclei) | I | 2.4 ± 0.7 | 2.9 ± 0.7* |
| II | 1.7 ± 0.7† | 2.2 ± 0.5†* | |
| CC | I | 3.45 ± 0.70 | 3.27 ± 1.4 |
| II | 2.92 ± 0.59† | 3.18 ± 1.4 | |
| C/Fi | I | 1.67 ± 0.30 | 1.89 ± 0.39* |
| II | 1.47 ± 0.29† | 1.67 ± 0.28†* | |
| CFPE (capillaries (1000 μm)−1) | I | 5.55 ± 1.40 | 5.65 ± 1.57 |
| II | 4.84 ± 1.06 | 5.41 ± 0.80 | |
| Satellite cell distance to nearest capillary (μm) | I | 16.1 ± 1.8 | 17.7 ± 5.3 |
| II | 28.9 ± 8.3† | 13.9 ± 3.4* |
Values are means ± SD. †Significantly different compared with type I muscle fibres (P < 0.01). *Significantly different compared with Pre (P < 0.01). CC, capillary contacts; C/Fi, individual muscle fibre capillary‐to‐fibre ratio; CFPE, capillary‐to‐fibre perimeter exchange; I, type I muscle fibres; II, type II muscle fibres.