The concept of skeletal muscle memory: Evidence from animal and human studies.
Level 5 - mechanism / opinion, no new human data
Narrative review integrating animal and human literature with secondary analysis of previous training data.
PubMed 32175681 · doi:10.1111/apha.13465
What was done
The authors reviewed the evidence for skeletal muscle memory—specifically the myonuclear permanence hypothesis—across animal and human models of muscle fiber hypertrophy and atrophy. They also presented new data from previously completed exercise training studies to evaluate whether myonuclei gained during training are preserved during subsequent muscle loss.
What was found
The abstract reports no numerical values. It states that rodent models generally demonstrate myonuclei acquired during hypertrophy are maintained through atrophy, but evidence in human models remains ambiguous, with existing studies presenting data that both support and contradict the muscle memory hypothesis.
Why it matters
Clarifying whether muscle memory operates via myonuclear permanence informs exercise prescription, rehabilitation after periods of disuse, and the understanding of long-term adaptations to resistance training.
Limits
The abstract provides no sample sizes, effect estimates, or statistical data. The biological mechanism is primarily established in rodent models, and its applicability to human physiology remains unresolved.
Cited by
- supports The myonuclear domain theory posits that the maximum size of a muscle fiber is constrained by the number of nuclei present within it.
- context Muscle memory is mediated in part by myonuclei donated from satellite cells that fuse into muscle fibers and remain permanently.