Key result
A 15-day hindlimb unloading period increased TnC fast expression in whole soleus muscles due to an increased proportion of hybrid fast fibers, while remaining slow fibers showed no TnC-related changes.
Population
Rat soleus muscle fibers
Comparison
15-day hindlimb unloading (HU) vs Control muscle fibers
Design
Preclinical
Follow-up
15 days
Authors
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May inform rodent models of disuse atrophy; leaves open translation to human muscle unloading.
Hindlimb unloading in rats increases the expression of fast Troponin C isoforms in soleus muscle due to an increased proportion of hybrid fast fibers, without altering the functional properties of fibers that remain slow.
Kischel et al. (2001) studied this question. 15-day hindlimb unloading (HU) vs. Control muscle fibers was evaluated on TnC isoform expression and functional behavior. A 15-day hindlimb unloading period increased TnC fast expression in whole soleus muscles due to an increased proportion of hybrid fast fibers, while remaining slow fibers showed no TnC-related changes.
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