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. 2018 Aug 10;18(8):2619. doi: 10.3390/s18082619

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© 2018 by the authors.

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 (http://creativecommons.org/licenses/by/4.0/).

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HRV parameters: frequency domain (Relax vs. Stress). * denotes significant differences (p < 0.05) between adjacent boxplots. Adim refers to adimensional units.