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. 2020 Nov 23;10:20378. doi: 10.1038/s41598-020-76236-6

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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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Inflection Points and Peaks of Ultradian Power Anticipate the LH Surge Within and Across Individuals. (A) Cumulative histogram indicates the proportion of cycles showing an inflection point on a given day relative to LH surge onset (blue = HRV (RMSSD), maroon = DBT, dashed = inflection point, solid = subsequent peak). Box indicates that on day LH—4, ~ 90% of individuals had shown the HRV and DBT first inflection point. (B) Intra-vs. inter-individual range of days over which inflection points (“UR Inflection”) and subsequent peaks (“UR Peak”) of ultradian DBT and HRV power occurred. The range intra-individual range (2–3 cycles per individual) is 25% the size of the inter-individual range (45 total cycles).