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. 2020 Feb 21;8:94. doi: 10.3389/fbioe.2020.00094

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Copyright © 2020 Ballardini, Florio, Canessa, Carlini, Morasso and Casadio.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Experimental set-up. The participant was asked to stay still in the standing position, wearing headphones and our portable device composed by: (A) a sensor (IMU) placed on the back at L3 level; (B) the microprocessor unity connected to the PC via Wi-Fi; (C) two vibration motors attached to the skin of the participant: on the back and on the abdomen at L5 level. The IMU recorded the accelerometric signal and sent it to a microprocessor (WiPy) that saved them on a microSD card. The accelerometric measurements were used for controlling the vibration motors.