Abstract
Histochemical and biochemical investigations have been carried out in 2 sheep following unilateral recurrent laryngeal nerve paralysis and direct electrical stimulation of the denervated posticus muscles. The stimulation effect was determined histochemically (standard ATP-ase staining) and compared with the fibre pattern of normal posticus muscles. In addition, one-dimensional gel electrophoresis of myosin heavy-chain isoforms was carried out and correlated with the histochemical results. A dramatic increase of type I fibres could be seen after long-term low-frequency direct electrical stimulation of denervated posticus muscles of the sheep. Biochemically the amount of slow myosin heavy-chain isoforms was higher than in normal muscles.
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