Quantitative succinate-dehydrogenase histochemistry

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Abstract
Most muscles exhibit a mosaic pattern of staining intensities of their muscle fibres after the histochemical reaction for succinate dehydrogenase (SDH). Visually these muscle fibres are usually classified into three groups: with low (A-fibres), intermediate (B-fibres), and high (C-fibres) enzymatic activity (staining intensity). Cytospectrophotometric methods were employed to investigate whether discrete groups of muscle fibres could be discerned, comparable to those found after the visual classification. The classifications were based on quantitative parameters of the total absorbance per cell and the distribution of the coloured endproduct over the fibre cross area.

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