PMID: 6539677Jan 1, 1984Paper

Muscle fibre type characteristics in endurance trained and untrained individuals

European Journal of Applied Physiology and Occupational Physiology
J FridénB Ekblom

Abstract

The main fibre types of M. vastus lateralis of 10 trained or untrained male individuals (25-35 years) were quantitatively determined by morphological techniques; the fibre types being defined according to the M-band appearance. The volume density of mitochondria ( Vmit ) was higher in endurance-trained muscles. Vmit was higher in Type 1 than in Type 2 fibres, there being no difference between subtypes of Type 2 fibres. The volume density of lipid droplets ( Vli ) showed a wide range of values both with respect to degree of training and between fibre types. Z-band width was not influenced by endurance training, but was considerably larger in Type 1 than in Type 2 fibres. Discriminant analysis showed that 46% of the fibres, preclassified according to the M-band appearance, would have been correctly allocated on basis of the Vmit . The corresponding value for lipid droplets was 42% and for the Z-band width, 62%. It is concluded that Vmit is not a satisfactory criterion for discriminating between fibre types, especially between Type 2A and Type 2B in trained subjects. The study also shows that endurance training reduces the relative importance of individual-dependent factors in comparison with muscle fibre properties when concernin...Continue Reading

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Citations

Nov 18, 2000·Annals of Neurology·A FerreiroM Fardeau
Aug 1, 1987·Pflügers Archiv : European journal of physiology·H BaumannM C Schaub
Apr 7, 1990·Lancet·A J WadeJ M Round
Jan 1, 1989·Journal of Sports Sciences·R RamsbottomW Freeman
Sep 1, 1995·European Journal of Clinical Investigation·C Schalin-JänttiL C Groop
Apr 1, 1984·Acta Physiologica Scandinavica·B Essén-Gustavsson, J Henriksson
Jan 1, 1996·Archives of Physiology and Biochemistry·D FreyssenetC Denis
Oct 13, 2010·Journal of the Neurological Sciences·R CaglianiG P Comi
Mar 15, 2006·Scandinavian Journal of Medicine & Science in Sports·J-P TurpeinenY A Kesäniemi
May 2, 2006·Obesity·Vera B Schrauwen-HinderlingMarianne Eline Kooi
Jul 6, 2014·Physiological Reviews·Jaap G Neels, Paul A Grimaldi
Nov 24, 2020·Photobiomodulation, Photomedicine, and Laser Surgery·Rodolfo André DellagranaFernando Diefenthaeler

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