A fractal characterization of the type II fiber distribution in the extensor digitorum longus and soleus muscles of the adult rat

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Abstract
A method is proposed for the quantitative characterization of fiber type spatial distribution by means of the (correlation) fractal dimension. The method is applied to type II fiber distributions of the soleus and extensor digitorum longus muscles of the adult rat. The results obtained suggest that these distributions have fractal properties with a strong tendency for spreading, more pronounced in soleus muscle. The density of muscle fibers or the age do not seem to alter the features of the distribution. Computer-generated random patterns have virtually the same fractal dimension as the extensor digitorum longus distributions but fail to approximate those of the soleus muscle. This fractal method could find application as an alternative in the quantitative assessment of the fiber type grouping. © 1995 John Wiley & Sons, Inc.