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. 2013 Jun 21;15(6):e127. doi: 10.2196/jmir.2340

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©Lars Louis Andersen, Emil Sundstrup, Marianne Boysen, Markus Due Jakobsen, Ole Steen Mortensen, Roger Persson. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 21.06.2013.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on http://www.jmir.org/, as well as this copyright and license information must be included.

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Heart rate recording from one of the participants during one of the daily stair-walks. This participant walked five times from the ground floor to the fourth floor of the building in 10 minutes.