Figure 2 | Scientific Reports

Figure 2

From: Physical and electrophysiological motor unit characteristics are revealed with simultaneous high-density electromyography and ultrafast ultrasound imaging

Figure 2

(a) Simulation model. Cross-section of the Cylindrical volume conductor model of the limb: 1 mm skin layer, 2.5 mm subcutaneous layer and elliptical-shaped muscle (598 mm2 physiological cross-section area). The blue-shaded area is the US detection region (40 mm × 40 mm), including the whole muscle. (b) Distribution of MU territories (area range 5–44 mm2) inside the simulated muscle. (c) Normalized velocity profile of the tissue velocity simulation model. (d) Experimental setup overview. The right arm was positioned inside an isometric brace for torque measurements. A grid of 64 EMG electrodes (8 × 8, 1 cm inter-electrode distance) was placed over the biceps brachii. The US probe was positioned between the two central rows of the electrode grid.

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