Upper trapezius muscle: average rectified value (ARV). Slight shoulder elevation.
Upper trapezius muscle: average rectified value (ARV).
Map of the distribution of the differential longitudinal average rectified value on the surface of the upper trapezius. ARV calculation epoch = 0.5 s.
Grid of 5x13 electrodes with diameter of 3 mm spaced by 8 mm (32x96 mm).
Acquisition rate: 2 frames per second.
Reproduction rate: 2 frames per second with image interpolation.
Note the central innervation zone (blue band).