In vivo x-ray diffraction and simultaneous EMG reveal the timecourse of myofilament lattice dilation and filament stretch

Sage Malingen, Anthony Asencio, Julie Cass, Weikang Ma, Thomas Irving & Thomas Daniel
Muscle function within an organism depends on the feedback between molecular and meter-scale processes. Although the motions of muscle’s contractile machinery are well described in isolated preparations, only a handful of experiments have documented the kinematics of the lattice occurring when multi-scale interactions are fully intact. We used time-resolved X-ray diffraction to record the kinematics of the myofilament lattice within a normal operating context: the tethered flight of Manduca sexta. As the primary flight muscles...
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