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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Relationship between the thickness of the skin, fat layer, and muscles and the displacement of the ultrasound sensor at rest and during actions (the blue line is a state of rest, the yellow color is extension, the red color is grip).