Contractile characteristics and innervation ratio of rat soleus motor units.

@article{Chamberlain1989ContractileCA,
  title={Contractile characteristics and innervation ratio of rat soleus motor units.},
  author={Sam Chamberlain and Daniel M. Lewis},
  journal={The Journal of physiology},
  year={1989},
  volume={412},
  pages={1-21}
}
1. Physiological properties of motor units in the soleus muscle were studied in anaesthetized rats using ventral root splitting to isolate single units. 2. Motor unit types were classified by the same criteria used to classify cat hindlimb motor units into types FR (fast-twitch, fatigue-resistant) and type S (slow-twitch, fatigue-resistant). Type FR units were estimated to generate 10% of whole-muscle tension and type S 90%. All FR units showed sag in the unfused tetanus at frequencies with… CONTINUE READING

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