Table 2 Effect of Bax genotype on properties of myofibers in vivo.
Property | Muscle | Bax-positive ave ± SE (n) | Bax-null ave ± SE (n) | Significance* |
Cross-sectional area (μm2) of fast‡ myofibers | Soleus | 1045 ± 17.0 (451) | 785 ± 11.9 (500) | P < 0.0001 |
|  | Diaphragm | 873 ± 7.7 (1364) | 717 ± 6.9 (1570) | P < 0.0001 |
Cross-sectional area (μm2) of slow‡ myofibers | Soleus | 1399 ± 33.7 (193) | 1096 ± 16.6 (270) | P < 0.0001 |
|  | Diaphragm | 640 ± 15.0 (136) | 547 ± 12.8 (150) | P < 0.0001 |
Percentage of fast myofibers | Soleus | 70.2 ± 1.8 (3) | 70.8 ± 0.1 (3) | P > 0.7 |
|  | Diaphragm | 90.7 ± 0.7 (5) | 91.2 ± 0.8 (5) | P > 0.7 |
Cross-sectional area (mm2) of whole muscle | Soleus | 1.54 ± 0.12 (4) | 1.18 ± 0.06 (5) | P = 0.024 |
Total number of myofibers | Soleus | 1081 ± 36 (4) | 1102 ± 17 (5) | P > 0.5 |