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. 2022 Jul 8;54(11):1817–1830. doi: 10.1249/MSS.0000000000002989

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Copyright © 2022 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the American College of Sports Medicine.

This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal.

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Individual heart rate responses and chronic adaptations to LOW-HIIT. Individual mean heart rate responses during exercise intervals in weeks 1 to 4, weeks 5 to 8, and weeks 9 to 12 (full line indicates minimum required heart rate [≥80% HR_peak), dashed lines indicate lower bounds of the intended heart rates for weeks 5 to 8 [≥85% HR_peak] and week 9 to 12 [≥90% HR_peak] (A), individual changes in maximal oxygen uptake (B), individual changes in VT (C), individual changes in FACIT score (D), individual changes in physical functioning (E), and individual changes in social functioning (F).