Performance, alertness, and sleep after 3·5 years of 12 h shifts: A follow-up study |
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Authors: | Roger R. Rosa |
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Affiliation: | a National Institute for Occupational Safety and Health, Division of Biomedical and Behavioral Science, Cincinnati, OH, USA |
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Abstract: | Control room operators at a continuous processing plant have been working a 12 h/3-4 day rotating shift schedule for over 3 years. After 7 months on this schedule, our initial assessment indicated decrements in performance and alertness, and a mild to moderate sleep debt, when the 12 h shift schedule was compared to the previously-worked 8 h shift schedule. In an effort to track long-term adaptation to the schedule, we conducted a 3 & 5 year follow-up evaluation using the same set of measures. Long-term follow-up testing revealed persistent decrements in performance and alertness attributable to 12 h shifts, and 1-3 h reductions in total sleep time after 12 h night shifts. Little deterioration in performance or alertness was observed across the workweek, which suggested day-to-day recovery from the extended workshift. The popularity of the 12 h shift schedule at this worksite indicates that the workers are willing to tolerate extra fatigue to derive other benefits from this schedule. |
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Keywords: | Shiftwork Compressed workweek 12 h shifts Fatigue Alertness Performance stress |
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