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. 2018 Nov 28;3(4):60. doi: 10.3390/jfmk3040060

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© 2018 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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Heart rate (HR) during CrossFit^® sessions. (A) Absolute values; (B) relative values of HRmax using the 220-age equation. The shaded area corresponds to the standard deviation of HR during sessions.