@article{ref1,
title="Ramps or stairs: the choice using physiological and biomechanic criteria",
journal="Applied ergonomics",
year="1972",
author="Corlett, E. N. and Hutcheson, C. and Delugan, M. A. and Rogozenski, J.",
volume="3",
number="4",
pages="195-201",
abstract="A study using eight subjects compared the O(2) consumption, heart rate and maximum knee joint angles when climbing stairs or ramps ranging in slope from 10 degrees to 30 degrees . It was found that the physiological cost of stairs is always less than a ramp of equal slope and that stairs with a 6 in riser were usually better than those with a 4 in riser. The values of the flexion at the knee joint were compared with a theoretical analysis by Shinno and found to differ considerably.<p /> <p>Language: en</p>",
language="en",
issn="0003-6870",
doi="",
url="http://dx.doi.org/"
}