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. 2014 Jul 5;6:28. doi: 10.1186/2052-1847-6-28

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Copyright © 2014 Paulsen et al.; licensee BioMed Central Ltd.

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 is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Timeline for the experiment with young (upper line) and elderly participants (lower line). DXA: Dual-energy X-ray absorptiometry, MRI: Magnetic resonance imaging, MVC: Maximal voluntary contraction (isometric), 1RM: 1 repetition maximum, USI: ultrasound imaging, VO2: oxygen uptake (work economy).