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. 2017 Sep 19;4(3):e20. doi: 10.2196/humanfactors.7196

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©Sigrid Vorrink, Chantal Huisman, Helianthe Kort, Thierry Troosters, Jan-Willem Lammers. Originally published in JMIR Human Factors (http://humanfactors.jmir.org), 19.09.2017.

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 Human Factors, is properly cited. The complete bibliographic information, a link to the original publication on http://humanfactors.jmir.org, as well as this copyright and license information must be included.

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Application. The bar on the left side combines amount and intensity of steps. The physical activity (PA) goal is met when the horizontal stripe (representation of current PA status) is kept in the rising rectangle at all times until the green area is reached. Absolute number of steps and automated encouraging messages linked to current PA progress are also shown.