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Table 1 Fibre characteristics in different muscle groups in carriers and non-carriers of the PRKAG3 mutation.

From: The influence of the PRKAG3 mutation on glycogen, enzyme activities and fibre types in different skeletal muscles of exercise trained pigs

 

m. biceps femoris

m. longissimus dorsi

 

Carriers (n = 7)

Non-carriers (n = 7)

Carriers (n = 7)

Non-carriers (n = 7)

Fibre type (%)

    

I

27 ± 1

24 ± 1

15 ± 1

13 ± 1

IIA

7 ± 1

8 ± 1

4 ± 1

2 ± 1

IIAX

37 ± 2

33 ± 2

56 ± 3 *

38 ± 3

IIB

29 ± 1 *

35 ± 1

25 ± 2 *

47 ± 3

Fibre area (μm2)

    

I

2471 ± 194 *

1896 ± 146

2571 ± 196 *

1965 ± 192

IIA

3346 ± 330 *

2424 ± 173

2118 ± 326

1949 ± 426

IIAX

5443 ± 399 *

3352 ± 276

5088 ± 430 *

3856 ± 354

IIB

7054 ± 592 *

5224 ± 500

4630 ± 396

4576 ± 229

Relative fibre area (%)

    

I

15 ± 2

14 ± 1

9 ± 1

6 ± 1

IIA

5 ± 1

6 ± 1

2 ± 1

2 ± 1

IIAX

41 ± 2 *

33 ± 2

65 ± 3 *

39 ± 3

IIB

39 ± 3 *

47 ± 1

25 ± 3 *

53 ± 4

NADH intensity (%)

    

I High

100 ± 0

100 ± 0

100 ± 0

100 ± 0

IIA High

12 ± 6

12 ± 5

17 ± 17

0 ± 0

IIA Medium

88 ± 6

88 ± 5

83 ± 17

100 ± 0

IIAX Medium

57 ± 4 *

92 ± 3

25 ± 4 *

61 ± 6

IIAX Low

43 ± 4 *

8 ± 3

75 ± 4 *

39 ± 6

IIB Medium

2 ± 1

2 ± 1

13 ± 3 *

4 ± 2

IIB Low

98 ± 1

98 ± 1

87 ± 3 *

96 ± 2

  1. Fibre type composition was identified with myosin ATPase stains and type I and IIA+ IIX with myosin heavy chain antibodies.
  2. NADH-tetrazolium reductase staining intensity was subjectively evaluated as low, medium and high in the different fibre types.
  3. Data as means ± SE. * P < 0.05 significantly different to non-carriers.
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Acta Veterinaria Scandinavica

ISSN: 1751-0147