Key result
Ultrastructural evidence shows sarcomeres contracting down to 0.44 µm while maintaining parallel thick filament arrangement, supporting a model of thick filament sliding through the Z-disc.
Why the study?
How myofilaments operate at short mammalian skeletal muscle lengths was unknown, with a common assumption being that thick filaments get compressed at the Z-disc.
No takes yet. Share an insight, caveat, or question.
Questions models of filament compression at short lengths; leaves open cardiac sarcomere relevance.
Tomalka et al. (2022) studied Mammalian skeletal muscle physiology. Ultrastructural evidence shows sarcomeres contracting down to 0.44 µm while maintaining parallel thick filament arrangement, supporting a model of thick filament sliding through the Z-disc.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: