@article{ref1,
title="Behavioral and physiological indices of fatigue in a visual tracking task",
journal="Journal of safety research",
year="1992",
author="Heath, RA and Mascord, D. J.",
volume="23",
number="1",
pages="19-25",
abstract="Heart-rate variability, heart-rate inter-beat-interval (IBI) and reaction-time were significant indicators of the effects of fatigue (or boredom) during a lengthy visual tracking task. Seventeen subjects participated in the visual tracking task, which lasted 140 minutes. Heart-rate significantly decreased across the session, while heart-rate variability increased. A significant increase in the average log value of the power contribution for the frequency band 0.08-0.12 Hz of the cardiac frequency signal was found in the final half of the session. Although performance on the primary tracking task did not deteriorate over time, there was a significant increase in mean reaction time on a secondary task that simulated an emergency situation. It was concluded that it may be possible to detect the onset of fatigue before any significant deterioration in operator performance occurs.<p />",
language="en",
issn="0022-4375",
doi="",
url="http://dx.doi.org/"
}