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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/).
The classification into high-responders and low-responders. Soldiers who decreased their 3000-m running test time were termed high-responders, while the low-responders either maintained or increased their running test time during the operation.