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Table 1 The proportion of fibre types in different muscles. The fibre type composition of m. rectus femoris, m. gastrocnemius and m. gluteus maximus were determined by SDS-PAGE based on electrophoretic separation of myosin heavy chain isoforms, and staining for myofibrillar ATPase after acid and alkaline preincubation. IIa, IIb, IId; myosin heavy chain types, IIA, IIB, IID; fibre types. Statistical significance of the differences between the corresponding groups (I vs. I, IIa vs. IIA etc.) from the two methods used: NS non significant; * P < 0.05; ** P < 0.01; *** P < 0.001.

From: Comparative analysis of mouse skeletal muscle fibre type composition and contractile responses to calcium channel blocker

 

muscle fibre populations % (SE)

SDS-PAGE

m. rectus femoris

m. gastrocnemius

m. gluteus maximus

I

24.3 (3.0)

15.7 (4.6)

23.2 (3.0)

IIa

27.7 (1.1)

20.6 (3.2)

26.6 (2.9)

IIb

24.3 (2.3)

28.1 (3.1)

15.9 (1.4)

IId

23.7 (1.7)

35.6 (2.2)

34.3 (1.3)

total

100.0

100.0

100.0

mATPase

I

21.1 (2.3) NS

7.6 (1.3) **

8.0 (2.6) **

IIA

38.1 (1.5) ***

22.7 (3.8) NS

45.0 (0.8) ***

IIB

19.2 (2.3) *

18.2 (1.8) **

31.1 (3.6) **

IID

21.6 (1.1) NS

51.5 (3.1) ***

15.9 (1.6) ***

total

100.0

100.0

100.0