ORCID: https://orcid.org/0000-0003-2939-0332
(April 2013):
The Munich ChronoType Questionnaire for Shift-Workers (MCTQ(Shift)).
In: Journal of Biological Rhythms, Vol. 28, No. 2: pp. 130-140
[PDF, 889kB]

Abstract
Sleep is systematically modulated by chronotype in day-workers. Therefore, investigations into how shift-work affects sleep, health, and cognition may provide more reliable insights if they consider individual circadian time (chronotype). The Munich ChronoType Questionnaire (MCTQ) is a useful tool for determining chronotype. It assesses chronotype based on sleep behavior, specifically on the local time of mid-sleep on free days corrected for sleep debt accumulated over the workweek (MSFsc). Because the original MCTQ addresses people working standard hours, we developed an extended version that accommodates shift-work (MCTQ(Shift)). We first present the validation of this new version with daily sleep logs (n = 52) and actimetry (n = 27). Next, we evaluated 371 MCTQ(Shift) entries of shift-workers (rotating through 8-h shifts starting at 0600 h, 1400 h, and 2200 h). Our results support experimental findings showing that sleep is difficult to initiate and to maintain under the constraints of shift-work. Sleep times are remarkably stable on free days (on average between midnight and 0900 h), so that chronotype of shift-workers can be assessed by means of MSF-similar to that of day-workers. Sleep times on free-days are, however, slightly influenced by the preceding shift (displacements < 1 h), which are smallest after evening shifts. We therefore chose this shift-specific mid-sleep time (MSFE) to assess chronotype in shift-workers. The distribution of MSFE in our sample is identical to that of MSF in day-workers. We propose conversion algorithms for chronotyping shift-workers whose schedules do not include free days after evening shifts.
Item Type: | Journal article |
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Form of publication: | Publisher's Version |
Keywords: | phase of entrainment; sleep timing; circadian clock; chronotype; shift-work; MCTQ |
Faculties: | Medicine > Institute of Medical Psychology |
Subjects: | 600 Technology > 610 Medicine and health |
URN: | urn:nbn:de:bvb:19-epub-23551-4 |
ISSN: | 0748-7304 |
Alliance/National Licence: | This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively. |
Language: | English |
Item ID: | 23551 |
Date Deposited: | 05. Mar 2015, 16:51 |
Last Modified: | 09. Aug 2024, 11:40 |