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Sleep length as a function of morning shift-start time in irregular shift schedules for train drivers: self-rated health and individual differences.
Stockholms universitet, Samhällsvetenskapliga fakulteten, Stressforskningsinstitutet.
Stockholms universitet, Samhällsvetenskapliga fakulteten, Stressforskningsinstitutet.
Stockholms universitet, Samhällsvetenskapliga fakulteten, Stressforskningsinstitutet.
Vise andre og tillknytning
2008 (engelsk)Inngår i: Chronobiol Int, ISSN 1525-6073, Vol. 25, nr 2, s. 349-58Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Sleep length as a function of morning shift-start time in irregular shift schedules for train drivers: self-rated health and individual differences.

Ingre M, Kecklund G, Akerstedt T, Söderström M, Kecklund L.

Stress Research Institute, Stockholm University, Sweden. michael.ingre@stressforskning.su.se

Forty-six male train drivers (mean age = 46.5, SD = 5.1) were recruited to participate in a diary study for 14 consecutive days with questions about their sleep and working hours. A polynomial mixed-effect regression model showed a curvilinear relation ( p < .001) between shift-start time and sleep duration for shifts starting at 03:00-12:00 hand with a near linear increase for ones starting between 04:30 and 09:00 h of approximately 0.7 h for every 1 h the shift was delayed. The longest sleeps were estimated at approximately 8 h before shifts that started at approximately 10:00 h. The shortest sleeps were found for shifts that started before 04:30 h and were estimated at approximately 5 h. Individual differences were estimated with a random-effect standard deviation of 0.51 h, independent of shift start time ( p = .005). One-half of the between-subject variance was explained by subjective health. A one-step decrease in health was associated with a 26 min increase in sleep length. The results have practical implications for constructing shift schedules. Early morning shifts reduced sleep length substantially and should be mixed with later start hours to avoid the accumulation of sleep dept. Delaying the shift-start past 10:00 h had little effect on sleep opportunity; however, delaying shift-start to between 04:30 and 9:00 h had a strong impact on sleep length, with 70% of the extra time used for sleep, suggesting large positive effects for this range of shift-start times.

sted, utgiver, år, opplag, sider
2008. Vol. 25, nr 2, s. 349-58
Emneord [en]
Shift-start time, Sleep duration, Train drivers, Irregular shift schedules
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-14169ISI: 000257613200016PubMedID: 18533329OAI: oai:DiVA.org:su-14169DiVA, id: diva2:180689
Merknad
Internt publ.nr P2659Tilgjengelig fra: 2008-06-17 Laget: 2008-06-17 Sist oppdatert: 2011-01-10bibliografisk kontrollert

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