Long-term adjustment of circadian rhythms to a rotating shiftwork schedule.

Dahlgren, Kerstin

doi:10.5271/sjweh.2555

Cited by 26 publications

(6 citation statements)

References 9 publications

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“…The observed decrease of alertness during night-time compared with daytime has been shown in several studies (Akerstedt 1977, Dahlgren 1981, Monk and Enibrey 1981. Kicsswetter 1988.…”

Section: The Circadian Rhythrrimentioning

confidence: 63%

A 14-h night-shift in the control room of a fire brigade

et al. 1995

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All 29 operators in the control room of a fire brigade performed test sessions during work and leisure time at 2-h intervals on a day with a 14-h night-shift, a day off and a day with a 10-h morning shift. The test sessions consisted of a visual search choice reaction time test and two Sternberg memory search tests (1 or 5 letters had to be memorized). Furthermore, the operators recorded their oral temperature and their subjective alertness before each test session. The subject also kept a diary of work and sleep times for 14 days. The circadian rhythm of body temperature was hardly changed by a single night-shift. Parallel to the body temperature, the subjective alertness fell significantly during the night-shift reaching a minimum value at 06:00 h. The mean reaction times increased non-significantly at the end of the night-shift and the results of the two Sternberg memory search tests showed no significant trends. The sleep of the operators after the night-shift was on average reduced to 5 hs 34 min. The results of subjective rating of alertness and reaction time test are interpreted as effects of the combined influences of circadian rhythmicity, sleep loss and time on professional task. Most results support the conclusion that a 14-h night-shift without extensive breaks is not acceptable.

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“…The observed decrease of alertness during night-time compared with daytime has been shown in several studies (Akerstedt 1977, Dahlgren 1981, Monk and Enibrey 1981. Kicsswetter 1988.…”

Section: The Circadian Rhythrrimentioning

confidence: 63%

A 14-h night-shift in the control room of a fire brigade

et al. 1995

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“…Interestingly, day sleep does not seem to improve much across a series of night shifts(34) (35). It appears, however, that night workers sleep slightly better (longer) than rotating workers on the night shift(36–38).…”

Section: Shift Work and Sleepmentioning

confidence: 99%

Sleep Loss and Fatigue in Shift Work and Shift Work Disorder

Åkerstedt

Wright

2009

Sleep Medicine Clinics

512

321

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Shift work is highly prevalent in industrialized societies (>20%) but, when it includes night work, it has pronounced negative effects on sleep, subjective and physiological sleepiness, performance, accident risk, as well as on health outcomes such as cardiovascular disease and certain forms of cancer. The reason is the conflict between the day oriented circadian physiology and the requirement for work and sleep at the "wrong" biological time of day. Other factors that negatively impact work shift sleepiness and accident risk include long duration shifts greater than 12 hours and individual vulnerability for phase intolerance that may lead to a diagnosis of shift work disorder; i.e., those shift workers with the greatest sleepiness and performance impairment during the biological night and insomnia during the biological day. Whereas some countermeasures may be used to ameliorate the negative impact of shift work on nighttime sleepiness and daytime insomnia (combined countermeasures may be the best available), there seems at present to be no way to eliminate most of the negative effects of shift work on human physiology and cognition.

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“…The degree of adaptation depends upon both the individual and the length of time spent on the shift. One longitudinal study, however, shows incomplete adaptation even after three years working the night shift (Dahlgren, 1981). Thus, at the very least, it is likely that night shift employees will experience long periods of fatigue and loss of alertness while adapting to the night shift schedule.…”

Section: Fatigue and Shiftworkmentioning

confidence: 99%

A Preliminary Examination of Railroad Dispatcher Workload, Stress, and Fatigue

Popkin¹,

Gertler²,

Reinach³

2001

PsycEXTRA Dataset

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This report presents the methods, findings and recommendations from a field study that examined the sources and levels of railroad dispatcher workload, stress, and fatigue. The study was initiated in response to concerns raised by two Federal Railroad Administration safety audits of dispatching operations in the U.S. The work was performed in three phases. The first phase identified suitable data collection instruments for measuring the three factors, Phase 2 involved a pilot field test of the instruments and field study procedures, and Phase 3 involved field data collection. Data collected in the field at two sites included physiological measures as well as self-report data, third party observation and paper records. Based on self-report health data, study participants aged 25 to 44 experienced several disorders at a significantly higher rate than found among the U.S. population. Information from the participant background survey was used in conjunction with physiological measures, activity count data and subjective ratings of workload, stress and fatigue. Subjective workload ratings were moderately associated with reported number of trains dispatched, regardless of shift or location while subjective fatigue ratings had the lowest association with this measure of workload. Subjective ratings of stress increased throughout all shifts while salivary cortisol levels, a physiological measure of stress, were within normal adult limits. Sleep patterns of study participants were typical of shift workers in general. An observational technique provided additional data on variations in workload throughout the shift. Modifications and enhancements to both the measures and protocol for future studies of railroad dispatcher workload, stress, and fatigue are offered as issues for further research. Appendices contain copies of the data collection tools used in the field study along with supporting data and statistical analyses.

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Long-term adjustment of circadian rhythms to a rotating shiftwork schedule.

Abstract: Long-term adjustment of circadian rhythms to a rotating shiftwork schedule. by Dahlgren K

Cited by 26 publications

References 9 publications

A 14-h night-shift in the control room of a fire brigade

A 14-h night-shift in the control room of a fire brigade

Sleep Loss and Fatigue in Shift Work and Shift Work Disorder

A Preliminary Examination of Railroad Dispatcher Workload, Stress, and Fatigue

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