Association of changes in work shifts and shift intensity with change in fatigue and disturbed sleep : a within-subject study

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Harma , M , Karhula , K , Ropponen , A , Puttonen , S , Koskinen , A , Ojajarvi , A , Hakola , T , Pentti , J , Oksanen , T , Vahtera , J & Kivimaki , M 2018 , ' Association of changes in work shifts and shift intensity with change in fatigue and disturbed sleep : a within-subject study ' , Scandinavian Journal of Work, Environment & Health , vol. 44 , no. 4 , pp. 394-402 . https://doi.org/10.5271/sjweh.3730

Title: Association of changes in work shifts and shift intensity with change in fatigue and disturbed sleep : a within-subject study
Author: Harma, Mikko; Karhula, Kati; Ropponen, Annina; Puttonen, Sampsa; Koskinen, Aki; Ojajarvi, Anneli; Hakola, Tarja; Pentti, Jaana; Oksanen, Tuula; Vahtera, Jussi; Kivimaki, Mika
Contributor: University of Helsinki, Clinicum
Date: 2018
Language: eng
Number of pages: 9
Belongs to series: Scandinavian Journal of Work, Environment & Health
ISSN: 0355-3140
URI: http://hdl.handle.net/10138/303904
Abstract: Objectives The aim of this study was to examine whether changes in work shifts and shift intensity are related to changes in difficulties to fall asleep, fatigue, and sleep length. Methods Questionnaire responses of hospital employees (N=7727, 93% women) in 2008, 2012, 2014 and 2015 were linked to daily-based records of working hours during three months preceding each survey. We used conditional logistic regression and longitudinal fixed-effects analyses to investigate odds ratios (OR) and 95% confidence intervals (CI) for each 25% within-individual change in the proportion of working hour characteristics in relation to changes in fatigue, difficulties to fall asleep, and 24-hour sleep length. Results Change in night but not in morning or evening shifts was associated with parallel changes in odds for longer sleep length (OR 1.45, 95% CI 1.28-1.64) and fatigue during free days (OR 1.38, 95% CI 1.16-1.64). Similarly, short shift intervals and having >2 but not >4 consecutive night shifts were associated with increased odds of fatigue during work and difficulties to fall asleep (OR 1.42, 95% CI 1.19-1.72 and OR 1.10, 95% CI 1.05-1.19, respectively). Among workers aged >= 50 years, the associations were the strongest between night shifts and longer sleep (OR 2.24,95% CI 1.52-3.81) and between higher proportion of short shift intervals and fatigue during free days (OR 1.68, 95% CI 1.10-2.54). Conclusions Among shift workers with fatigue or sleep problems, decreasing the proportion of night shifts and quick returns and giving preference to quickly forward-rotating shift systems may reduce fatigue.
Subject: forward-rotating shift
insomia
older worker
night shift
sleep duration
sleep length
sleep problem
sleepiness
shift interval
shift work
shift worker
working hours
QUICK RETURNS
JOB STRAIN
HEALTH
SCHEDULES
ALERTNESS
SYSTEM
PATTERNS
RECOVERY
IMPACT
NURSES
3142 Public health care science, environmental and occupational health
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