Late chronotype and high social jetlag are associated with burnout in evening-shift workers: Assessment using the Chinese-version MCTQ^shift

Apr 17, 2018Chronobiology international

Late sleep patterns and big differences between work and free-day schedules are linked to burnout in evening-shift workers

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Abstract

A total of 288 shift workers were assessed for chronotype using the validated Munich ChronoType Questionnaire.

Chronotype is evaluated by calculating corrected mid-sleep time based on individual shift schedules.
Significant correlations were found between mid-sleep times and scores on the Morningness-Eveningness Questionnaire.
Evening-shift workers who slept late on workdays had significantly longer sleep durations compared to those who slept early.
Late chronotype and high social jetlag were associated with higher burnout scores in evening-shift workers after adjusting for demographics and work characteristics.
The Chinese-version MCTQ is confirmed as a valid tool for assessing chronotype in this population.

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Chronotypes are associated with shift work tolerance and sleep in shift workers, and sleep mediates the impact of shift work on mental health. However, the role of chronotype in the association between shift work and mental health has not been clarified. In this study, we aimed to examine the association between chronotype and burnout in shift workers, using the validated Munich ChronoType Questionnaire for shift workers (MCTQ). A total of 288 shift workers with irregular shift frequencies were recruited and completed the Chinese-version MCTQand the Morningness-Eveningness Questionnaire (MEQ). Chronotypes were assessed by the calculation of corrected mid-sleep time (MSF) from mid-sleep time on free days (MSF) based on their exact shift schedules. Another 26 evening-shift nurses were monitored with actigraphy for at least two consecutive evening shifts and the following two free days. Burnout was evaluated using the Copenhagen Burnout Inventory. We found that MSF, MSFand mid-sleep time on workdays (MSW) had normal distributions and correlated significantly with MEQ scores (r = - 0.47, -0.45 and -0.47, respectively; all p < 0.001). MSW was more closely correlated with actigraphy-derived mid-sleep time on the free day before workdays than that on workdays (r = 0.61 and 0.48, respectively, p < 0.05). Sleep duration was significantly longer on workdays among evening-shift workers who slept late on workdays than those who slept early (β = 0.59, p < 0.001). After demographic and work characteristics were adjusted for in linear regression models, late chronotype and high social jetlag were associated with burnout scores in evening-shift workers. In conclusion, the Chinese-version MCTQis a valid tool for chronotype assessment. Interventions to improve sleep in shift workers should be tailored to chronotype due to variations in sleep behavior. Late chronotype may be an inherent feature of mental health problems, because the association with burnout was significant in both day workers in previous studies and shift workers. shift shift E E E shift SC SC

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Late chronotype and high social jetlag are associated with burnout in evening-shift workers: Assessment using the Chinese-version MCTQ^shift

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