@article{ref1,
title="Metabolic and cardiorespiratory response during free swimming and treadmill walking",
journal="Journal of applied physiology (APS DC)",
year="1971",
author="McArdle, W. D. and Glaser, R. M. and Magel, J. R.",
volume="30",
number="5",
pages="733-738",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0021-8987",
doi="",
url="http://dx.doi.org/"
}