Key result
The combined intervention of hyperthyroidism and hindlimb suspension transformed all slow type I fibers into fast MHC isoforms, demonstrating the soleus muscle lacks refractory fibers.
Population
Adult female Sprague-Dawley rats (n=36)
Comparison
Hyperthyroidism, hindlimb suspension, or… vs Control group
Design
Preclinical
Authors
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Animal data refute refractory soleus type I fibers; leaves open human translation to disuse or thyroid disorders.
Absolute Event Rate: 0% vs 80%
The study demonstrates that the soleus muscle does not contain refractory slow type I fibers, but rather populations with varying sensitivity to altered physiological conditions.
Caiozzo et al. (1997) studied MHC isoform plasticity (n=36). Hyperthyroidism (T3) and hindlimb suspension (HS) vs. Control was evaluated on Percentage of slow type I fibers in the soleus muscle. The combined intervention of hyperthyroidism and hindlimb suspension transformed all slow type I fibers into fast MHC isoforms, demonstrating the soleus muscle lacks refractory fibers.
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