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. 2023 Sep 26;12:e52161. doi: 10.2196/52161

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©Junghwan Park, Meelim Kim, Mohamed El Mistiri, Rachael Kha, Sarasij Banerjee, Lisa Gotzian, Guillaume Chevance, Daniel E Rivera, Predrag Klasnja, Eric Hekler. Originally published in JMIR Research Protocols (https://www.researchprotocols.org), 26.09.2023.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR Research Protocols, is properly cited. The complete bibliographic information, a link to the original publication on https://www.researchprotocols.org, as well as this copyright and license information must be included.

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Spectral power density of the designed decision rule input signal of the JustWalk JITAI study. It is shown to determine whether sufficient excitation across key frequencies is established within the trial.