Tibialis anterior muscle: instantaneous signals. Slight dorsiflexion of the foot.
Tibialis anterior muscle: instantaneous signals.
Upper panel: longitudinal differential signals under each column of the electrode grid.
Lower right panel: three-dimensional (3D) representation of the instantaneous differential voltage on the surface of the tibialis anterior during a 40 ms (0.040s) time interval.
Grid of 5x12 electrodes of 3mm diameter spaced by 8mm (32 x 88mm).
Acquisition rate: 2048 frames per second.
Reproduction rate: 40 frames per second (500 times slower) with image interpolation.
Two motor unit action potentials can be seen: the first MU is under columns 1-4 (activated after 5ms), the second is under columns 4-5 (activated after 30ms).