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. 2020 Oct 19;10:17826. doi: 10.1038/s41598-020-74140-7

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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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Maximum heart rate for the exercise plus supplement (red line) and exercise plus placebo (blue line) interventions. The x-axis is the week of the study and the y-axis is the average maximum heart rate. Each point on the plot represents the average maximum heart rate across all participants in that intervention condition for that week.