Table 1.
Muscle fiber type percentages in aged C57BL/6 and ephrin-A3−/− mice
| Muscle |
|||||
|---|---|---|---|---|---|
| MyHC | TA | EDL | GAS | PLN | SOL |
| Aged C57BL/6 uninjured | |||||
| I | 0.26 ± 0.05 | 1.68 ± 0.34 | 4.48 ± 1.43 | 1.26 ± 0.28 | 58.65 ± 2.18 |
| I/IIA | 0.04 ± 0.02 | 0.54 ± 0.41 | 1.09 ± 0.73 | ||
| IIA | 10.31 ± 0.42 | 12.64 ± 1.74 | 34.14 ± 4.28 | 39.19 ± 3.67 | 43.36 ± 3.85 |
| IIX | 2.54 ± 0.85 | 6.53 ± 1.91 | 0.69 ± 0.16 | 3.26 ± 1.66 | 0.20 ± 0.10 |
| IIB | 78.25 ± 9.99 | 74.21 ± 4.99 | 67.50 ± 3.52 | 59.02 ± 0.39 | 0.33 ± 0.18 |
| Aged ephrin-A3−/− uninjured | |||||
| I | 0.23 ± 0.03 | 0.44 ± 0.07 | 4.38 ± 0.80 | 1.38 ± 0.33 | 47.86 ± 2.71 |
| I/IIA | 0.03 ± 0.01 | 0.03 ± 0.01 | 1.45 ± 0.32 | ||
| IIA | 11.79 ± 1.31 | 21.52 ± 1.52 | 30.81 ± 3.77 | 45.17 ± 3.01 | 50.69 ± 2.55 |
| IIX | 2.39 ± 0.40 | 4.84 ± 0.69 | 1.65 ± 0.63 | 2.72 ± 0.29 | 0.14 ± 0.07 |
| IIB | 73.49 ± 2.89 | 69.04 ± 4.06 | 63.85 ± 4.07 | 56.21 ± 2.49 | 0.45 ± 0.18 |
| Aged C57BL/6 nerve crush | |||||
| I | 0.08 ± 0.04 | 1.57 ± 0.70 | 6.90 ± 0.96 | 1.85 ± 0.70 | 57.58 ± 0.59 |
| I/IIA | 0.05 ± 0.05 | 0.23 ± 0.12 | 7.99 ± 3.42 | ||
| IIA | 20.01 ± 3.50 | 26.14 ± 4.53 | 36.19 ± 5.27 | 47.09 ± 6.83 | 34.43 ± 3.99 |
| IIX | 2.47 ± 0.95 | 4.23 ± 2.07 | 0.84 ± 0.65 | 1.32 ± 0.54 | 0.17 ± 0.09 |
| IIB | 74.99 ± 4.68 | 73.97 ± 8.53 | 63.94 ± 0.54 | 61.40 ± 2.21 | 0.50 ± 0.27 |
| Aged ephrin-A3−/− nerve crush | |||||
| I | 0.29 ± 0.04 | 0.63 ± 0.13 | 5.25 ± 0.72 | 1.62 ± 0.45 | 50.02 ± 1.85 |
| I/IIA | 0.05 ± 0.02 | 0.05 ± 0.02 | 5.18 ± 0.68 | ||
| IIA | 25.18 ± 1.96 | 33.53 ± 2.93 | 44.98 ± 2.26 | 53.73 ± 3.36 | 44.79 ± 2.12 |
| IIX | 3.63 ± 0.65 | 7.34 ± 1.73 | 1.21 ± 0.30 | 2.07 ± 0.34 | 0.19 ± 0.09 |
| IIB | 74.85 ± 4.41 | 69.25 ± 5.09 | 68.27 ± 2.91 | 54.56 ± 4.64 | 0.61 ± 0.09 |
Values are means ± SE. EDL, extensor digitorum longus; GAS, gastrocnemius; MyHC, myosin heavy chain; PLN, plantaris; SOL, soleus; and TA, tibialis anterior.