Munich Chronotype Questionnaire
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The Munich Chronotype Questionnaire (MCTQ) was created in 1976 by
Till Roenneberg Till Roenneberg (born 4 May 1953) is a professor of chronobiology at the Institute of Medical Psychology at Ludwig-Maximilian University (LMU) in Munich, Germany. Roenneberg, in collaboration with Martha Merrow, explores the impact of light ...
and Martha Merrow at
Ludwig-Maximilians University The Ludwig Maximilian University of Munich (simply University of Munich or LMU; german: Ludwig-Maximilians-Universität München) is a public research university in Munich, Germany. It is Germany's sixth-oldest university in continuous operatio ...
(LMU) Munich. The MCTQ samples sleep and circadian rhythm data from more than 25,000 participants. Questions about work day and free day sleep schedules, work details, and lifestyle provide data to aid in the understanding of how biological clocks work in social life, such as Roenneberg's conclusions of social jetlag. The MCTQ categorizes each participant into one of seven chronotype groups, and utilizes data on participants’ midsleep phase and
sleep debt Sleep debt or sleep deficit is the cumulative effect of not getting enough sleep. A large sleep debt may lead to mental or physical fatigue, and can adversely affect one's mood, energy and ability to think clearly. There are two kinds of sleep ...
to survey what "type" of sleeper each person is. From these data, the MCTQ offers methods to make up for sleep debt (if any), and offers suggestions on what to do to wake up earlier or sleep later. This Chronotype Questionnaire is important because it delves into the social aspects of circadian rhythms. By testing behavior rather than directly testing genetic factors, the MCTQ may offer new information regarding how the influences of external factors (like geographic location or seasons) or things such as obesity or social jetlag, may relate to genetic predispositions of circadian rhythms.The search for circadian clock components in humans: new perspectives for association studies. Allebrandt KV, Roenneberg T. Braz J Med Biol Res. 2008 Aug;41(8):716-21.


References

{{Reflist Circadian rhythm