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Circadian cortisol profiles in shift workers

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Benedikt Baur

on 11 May 2011

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Transcript of Circadian cortisol profiles in shift workers

Circadian cortisol profiles in shift workers SE: Neuere Psychologische Fachliteratur
LV-Leiterin: Ao. Univ.-Prof. Dr. Anna N. Iwanowa Benedikt Baur stress CAR - Cortisol Awakening Response altered CARs:
health problems
psychopathologic status
chronic stress
depressive symptoms
low sleep quality
ptsd effects of cortisol in the circulation:
elevation of blood glucose
negative effects on immunotransmitters
further effects in the brain + shift work "It is not so much that the stress-response runs out, but rather (...) that the stress-response can become more damaging than the stressor itself, especially when the stress is purely psychological" (Sapolsky 2003) major processes to control diurnal
cortisol variation:
SCN - circadian pacemaker
alteration of wake/sleep reported issues on
(night) shift work:
cardiovascular/gastrointestinal diseases
sleep disorders
metabolic disturbances
depression circadian rythim Why is stress dangerous? study 2. results 1. study design -recruitment:
N=118 workers from a plant in West Germany
2 shift systems:
day (morning/evening rota)
night (permanent)
+ new system:
shift rota: morning/evening/night -measurement:
biochemical analysis of saliva for cortisol
sleep quality
psychological assessment
sociodemographic variables (Jenkins sleep-quality-index (Jenkins et al. 1988)) Maastricht-vital exhaustion-questionnaire (Appels et al. 1987)
Trier inventory for the assessment of chronic stress (TICS) (Schulz et al. 2004)
Effort reward imbalance (Siegrist etc al. 2004) - cross sectional design
- second collection after 2 months only for P2 group 3. discussion strenghts & limitations
focus on CAR (relation to diseases)
4 relevant experimental groups
repeated sampling after 2 months
cross-sectional data
no data collection before onset of new shift system
bias in psychological assessment (motivational)
ambulatory saliva sampling underlies uncontrollable bias results
all workers showed CAR after awakening & decline afterwards
cortisol profiles do not differ that much (P groups vs. C groups)
switch into new system causes the most changes to cortisol profile
night shift profile generally attenuated, except for P1
fast rotating shift work is mor favorable compared to permanent night shift work
but: "Question about optimal shift system remains open..." own thoughts... 20% of workforce in shift work, one third of them in permanent night shift
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