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. 1971 Jul;216(1):171–179. doi: 10.1113/jphysiol.1971.sp009516

Effects of nerve cross-union on rat intracellular potassium in fast-twitch and slow-twitch rat muscles

J F Y Hoh, B Salafsky
PMCID: PMC1331967  PMID: 5558348

Abstract

1. Electrolytes of normal, self-innervated and cross-innervated extensor digitorum longus and soleus muscles of rats have been determined.

2. [K]i was 173 m-equiv/l. for both normal and self-innervated extensor digitorum longus. In cross-innervated extensor digitorum longus it was reduced to 159 m-equiv/l.

3. For normal and self-innervated soleus, [K]i was 150 m-equiv/l. and 154 m-equiv/l. respectively. In cross-innervated soleus it was increased to 182 m-equiv/l.

4. The content and distribution of most other electrolytes of cross-innervated soleus, as well as its weight, were not significantly different from those of controls. On the other hand, cross-innervated extensor digitorum longus weighed about half as much as controls and contained markedly elevated Na+, Cl- and extrafibre water and reduced non-collagenous protein and intrafibre water.

5. It is concluded that [K]i of fast-twitch and slow-twitch muscle fibres are under neural regulation. Possible mechanisms for this regulation are discussed.

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Selected References

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