Key result
Older mdx mice lost ~80% of their maximum force after one eccentric contraction, with senescent 22-month-old mice losing ~93%, correlating with increased branched fibers.
Why the study?
Duchenne muscular dystrophy is characterized by progressive cycles of necrosis and regeneration, prompting investigation into the morphological and contractile chronology of dystrophic skeletal muscle pathology across the lifespan.
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May warrant caution with eccentric loading in aging DMD; leaves open branched-fiber role in human progression.
Kiriaev et al. (2021) studied Duchenne muscular dystrophy. Aging and eccentric contraction was evaluated on Maximum force loss after one eccentric contraction of 20% strain. Older mdx mice lost ~80% of their maximum force after one eccentric contraction, with senescent 22-month-old mice losing ~93%, correlating with increased branched fibers.
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