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Adaptive transformation of rat soleus motor units during growth.

作者信息

Kugelberg E

出版信息

J Neurol Sci. 1976 Mar;27(3):269-89. doi: 10.1016/0022-510x(76)90001-0.

DOI:10.1016/0022-510x(76)90001-0
PMID:131182
Abstract

Soleus motor units of 5 and 34 week-old rats, weighing 150 and 520 g respectively, were examined for contraction time at 36 degrees C, innervation ratio as well as cross-sectional area, ATPase and SDH activity of fibres. The muscle was continuously adjusted to the growth of the animal. Between 5 and 34 weeks the proportion of Type II fibre units with 15-26 msec contraction time decreased from 33% to 10% and Type I fibre units with 27-40 msec contraction time thus increased from 67 to 90%. This was parallelled by approximately the same relative changes in number of Type II and Type I fibres.

摘要

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