@article{ref1,
title="Older workers and longer work days: are they compatible?",
journal="International journal of industrial ergonomics",
year="1994",
author="Keran, C. M. and Duchon, J. C. and Smith, T. J.",
volume="13",
number="2",
pages="113-123",
abstract="As part of a larger shiftwork project, the U.S. Bureau of Mines conducted an extended workday study at an underground North American metal mine. A group of 25 underground shiftworkers changed from a 7-by-2, 8-hour shift schedule to a 4-by-4, 12-hour shift schedule. Data collected for both schedules consisted of subjective, psychomotor and physiological measures. The focus of this paper is to determine whether older workers (mean age = 49.6) manifest increased levels of fatigue compared to younger workers (mean age = 26.5) on 8-hour and 12-hour schedules. Results indicate that worker age influences all three types of measures for both schedules. However, these age differences do not appear to be more pronounced on the 12-hour relative to the 8-hour schedule. It can be argued, therefore, that older workers have no more difficulties with a 12-hour than with an 8-hour schedule.<p />",
language="",
issn="0169-8141",
doi="",
url="http://dx.doi.org/"
}