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. 2021 Jan 20;18(3):860. doi: 10.3390/ijerph18030860

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© 2021 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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Menstrual cycle phase effect (A) and time* menstrual cycle interaction (B) on performance variables in the bouts throughout the interval running protocol. Ve: ventilation; BF: breathing frequency; VO₂: oxygen consumption; VCO₂: carbon dioxide production; RER: respiratory exchange ratio; HR: heart rate; EE: energy expenditure; RPE: rate of perceived exertion; EFP: early-follicular phase; LFP: late-follicular phase; MLP: mid-luteal phase. ^# Significant differences in LFP compared to EFP.