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. 2020 Jul 15;11:3530. doi: 10.1038/s41467-020-17301-6

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — Resistance change of the strain sensor by fixing the sensor (a) on the knee and c on the index finger, and (b) and (d) illustrate the stability of the strain sensor even when the joints were flexed or extended. e–g Three key places when the blade of the paddle was dug into the water and pulled it back. Resistance change of the strain sensor for dragon boat paddler training: standard states when fixed on the (h) shoulder, (j) wrist, and (l) elbow, and their nonstandard counterparts are shown in (i), (k), and (m), respectively.