Table 2 Muscle fibre type (MFT-I, IIA, and IIX) percentages (mean ± SD) in each muscle examined; comparison between Arabians and Quarter horses
Muscle | Arab/Quarter N | Arab MFT-I % | Quarter MFT-I % | Arab MFT-IIA % | Quarter MFT-IIA % | Arab MFT-IIX % | Quarter MFT-IIX % |
|---|---|---|---|---|---|---|---|
SCDM AP, QP | 1/4 | 86.7 | 82.8 ± 25.9 | 13.3 | 9.3 ± 14.7 | 0.0 | 7.9 ± 11.7 |
Diaphragm AP, QP | 3/5 | 80.4 ± 9.4 | 67.6 ± 12.3 | 19.6 ± 9.4 | 32.4 ± 12.3 | 0.0 ± 0.0 | 0.0 ± 0.0 |
Multifidus 4, AP | 3/2 | 59.3 ± 14.9 | 37.8 ± 1.9 | 33.1 ± 5.8 | 34.8 ± 7.3 | 7.6 ± 10.7 | 27.4 ± 9.3 |
Psoas minor AP, QP | 3/4 | 58.6 ± 4.9 | 54.8 ± 1.3 | 26.2 ± 13.3 | 25.1 ± 10.1 | 15.3 ± 15.0 | 20.1 ± 11.2 |
Multifidus 3 AP, QP | 3/3 | 53.5 ± 16.7 | 57.8 ± 8.1 | 33.0 ± 1.8 | 26.9 ± 2.2 | 13.5 ± 14.9 | 15.4 ± 6.8 |
Multifidus 2, AP | 3/5 | 52.4 ± 12.1 | 38.3 ± 12.4 | 30.6 ± 4.1 | 24.5 ± 9.8 | 17.0 ± 15.0 | 37.1 ± 21.5 |
Multifidus 1 | 3/1 | 51.4 ± 30.8 | 42.1 ± 12.1 | 24.1 ± 9.1 | 22.4 ± 6.1 | 24.5 ± 23.9 | 35.5 ± 18.2 |
SCDL | 3/4 | 39.1 ± 5.2 | 45.9 ± 19.2 | 54.9 ± 11.5 | 36.5 ± 8.1 | 6.0 ± 6.3 | 17.6 ± 16.5 |
Multifidus 5 | 3/3 | 37.2 ± 7.5 | 36.3 ± 15.8 | 35.3 ± 4.4 | 22.4 ± 6.4 | 27.4 ± 11.5 | 41.3 ± 18.9 |
Psoas major | 4/5 | 36.6 ± 6.2 | 26.2 ± 11.2 | 21.5 ± 5.2 | 13.0 ± 3.7 | 41.9* ± 3.2 | 60.8* ± 9.1 |
Biceps femoris | 2/5 | 20.0 ± 0.1 | 15.6 ± 7.7 | 42.6 ± 9.0 | 20.3 ± 2.3 | 37.4 ± 9.1 | 64.1 ± 7.5 |
Iliocostalis | 4/3 | 19.5 ± 10.4 | 14.0 ± 5.2 | 25.8 ± 4.2 | 16.0 ± 0.9 | 54.7 ± 8.1 | 70.0 ± 4.7 |
Longissimus | 4/4 | 16.9* ± 4.6 | 9.9* ± 1.4 | 29.8 ± 4.9 | 23.7 ± 5.4 | 53.2 ± 8.0 | 66.4 ± 5.8 |
Gluteus medius | 3/3 | 12.2 ± 6.3 | 7.6 ± 3.2 | 25.6 ± 8.7 | 18.8 ± 2.0 | 62.2 ± 2.5 | 73.6 ± 5.2 |