Key result
Hypothyroidism decreased maximum specific force across all MHC isoforms, with the greatest decrease (~40% vs ~20%) in fibers expressing fast MHC isoforms compared to slow MHC isoforms.
Hypothyroidism reduces maximum specific force in rat diaphragm muscle fibers, primarily by decreasing myosin heavy chain content per half-sarcomere, especially in fast MHC isoforms.
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Hypothyroidism may impair rat diaphragm force generation; hypothesis-generating for human respiratory effects, should not change practice.
Geiger et al. (2002) studied Hypothyroidism. Hypothyroidism vs. Control was evaluated on Maximum specific force (F(max)) and MHC content per half-sarcomere. Hypothyroidism decreased maximum specific force across all MHC isoforms, with the greatest decrease (~40% vs ~20%) in fibers expressing fast MHC isoforms compared to slow MHC isoforms.
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