The relationship between capillarisation and fibre types during compensatory hypertrophy of the plantaris muscle in the rat.

摘要: Compensatory hypertrophy of the plantaris muscle was obtained by denervation its synergists. This is characterised a 32% increase in mass. The consists type I and IIa (oxidative), IIb (glycolytic) fibres. Fibres all types were enlarged hypertrophied muscles proportion fibres increased. We investigated capillarisation after as related to fibre type. In order obtain this information new technique used, capable estimating not only traditional overall capillary density (CD) but also an index heterogeneity spacing (LogSD), 'local ratio' (LCFR), separately for each type, finally respective 'capillary density' (CFD). It found both control that CD higher deep (few fibres) than superficial part (considerable number fibres). LogSD lower, indicating less heterogeneity, muscle. LCFR CFD greater region muscles. Furthermore larger significantly different from However, increased compared with controls, demonstrating proliferation. decreased controls suggests here proliferation lags behind Endurance training had no significant effects any indices used.