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. 2014 Jan 27;56(1):8. doi: 10.1186/1751-0147-56-8

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

Different fascicles of mm. multifidi marked with numbers 1(most superficial) - 5 (deepest). Significant differences between breeds (*) were calculated according to the Mann–Whitney rank test. Muscles considered as postural based on their MFT-I/MFT-II portion in Arabian (AP) and Quarter horse (QP). N = number of horses. SCDL = m. sacrocaudalis dorsalis lateralis, SCDM = m. sacrocaudalis dorsalis medialis.