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. 2021 Dec 2;9:759032. doi: 10.3389/fpubh.2021.759032

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Copyright © 2021 Upadhyaya, Hasan, Abdel-Khalek, Hassan, Srivastava, Sharan, Islam, Saad and Vo.

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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(A) Back view showing the posterior part of the wearable devices with embedded sensor and and front view showing the anterior part of the embedded sensor (118). (B) Signal collected by flow meter and FBG during quite breathing and tachypnea (119).