@article{ref1,
title="How much can we improve two-section watch bills? Sleepiness, fatigue, and psychomoter vigilance performance during naval operations in the 6/6 and 7-5-5-7 watch bills",
journal="Proceedings of the Human Factors and Ergonomic Society annual meeting",
year="2023",
author="Röttger, Stefan and Giesche, Melanie and Abendroth, Johanna and Jacobsen, Thomas and Matsangas, Panagiotis and Shattuck, Nita Lewis",
volume="67",
number="1",
pages="1273-1278",
abstract="A traditional two-section watch bill (6 hours on / 6 hours off, starting at midnight - &quot;6/6&quot;) and a two-section watch bill better adapted to the human circadian rhythm (watches of 7, 5, 5, and 7 hours duration, starting at 3 a.m. - &quot;7-5-5-7&quot;) were trialed on two vessels of the German Navy with 67 study participants in a crossover design. Questionnaires were used to assess subjective sleepiness (ESS, KSS) and subjective fatigue (FSS). The psychomotor vigilance task (PVT) was self-administered with wearable devices before and after each watch. Over the course of seven days at sea, PVT performance worsened significantly with the 6/6, but not with the 7-5-5-7 watch bill. In the 6/6 watch bill, number of participants with excessive sleepiness and high levels of fatigue was higher than in the 7-5-5-7 watch bill although not at a statistically significant level. Marked differences between watch bills in crew performance started to emerge after 6 days.<p /> <p>Language: en</p>",
language="en",
issn="2169-5067",
doi="10.1177/21695067231192909",
url="http://dx.doi.org/10.1177/21695067231192909"
}