@article{ref1,
title="Physiological demands of hiking the grand canyon",
journal="Wilderness and environmental medicine",
year="2010",
author="Sperlich, Billy and Haegele, Matthias and de Marées, Marcus and Mester, Joachim and Linville, John",
volume="21",
number="3",
pages="276-278",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="1080-6032",
doi="10.1016/j.wem.2010.04.002",
url="http://dx.doi.org/10.1016/j.wem.2010.04.002"
}