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. 2020 Apr 14;10:6336. doi: 10.1038/s41598-020-63297-w

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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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(1) Height adjustment bar; (2) load cell; (3) steel cable; (4) belt attached to the steel cable and participant; (5) sensorized platform by four load cells; (6) non-motorized treadmill (NMT); (7) Hall-effect sensor positioned on the treadmill’s front cylinder to determine the velocity that results from the connection with the acquisition system; (8) acquisition system composed of portable amplifier (MKTC5-10, MK) and an acquisition module (NI USB-6009); (9) computer; (10) NIRS Portamon unit fixed to the upper limb (biceps brachii muscle); (11) NIRS Portamon unit fixed to the lower limb (vastus lateralis muscle); (12) heart rate monitor (Polar V-800), (13) monitor showing the force, velocity and power during tethered test (online signals).