Author Interviews, BMJ, Circadian Rhythm, JAMA, Occupational Health / 27.02.2021
Morning Larks More Productive at Work and Have Fewer Disability Pensions
MedicalResearch.com Interview with:
Dr Tapio Räihä
Center for Life Course Health Research
University of Oulu, Oulu, Finland
MedicalResearch.com: What is the background for this study?
Response: In ageing societies, understanding risk factors for pre-term disability pensions and poor work ability is an important research priority. We studied whether individual-level chronotype could contribute to these. Previous research has shown that evening chronotypes (E-types) have poorer health compared with morning chronotypes (M-types), and that E-types may have difficulties to function during standard morning working hours. This study was the first population-level study with register linkage to find out whether eveningness would be associated with poor work ability and disability pensions, too.
We surveyed chronotype (with the Morningness–Eveningness Questionnaire) among 5831 non-retired Finns born in 1966 when they were at age 46 years, and compared it with their current perceived work ability. We then followed the emergence of new registered disability pensions during the next 4 years. Multivariate logistic and Cox regression analyses of the associations between chronotype and the outcomes were separately adjusted for sleep, health and behaviours, sociodemographic and economic factors, or working times
Response: In ageing societies, understanding risk factors for pre-term disability pensions and poor work ability is an important research priority. We studied whether individual-level chronotype could contribute to these. Previous research has shown that evening chronotypes (E-types) have poorer health compared with morning chronotypes (M-types), and that E-types may have difficulties to function during standard morning working hours. This study was the first population-level study with register linkage to find out whether eveningness would be associated with poor work ability and disability pensions, too.
We surveyed chronotype (with the Morningness–Eveningness Questionnaire) among 5831 non-retired Finns born in 1966 when they were at age 46 years, and compared it with their current perceived work ability. We then followed the emergence of new registered disability pensions during the next 4 years. Multivariate logistic and Cox regression analyses of the associations between chronotype and the outcomes were separately adjusted for sleep, health and behaviours, sociodemographic and economic factors, or working times 
Dr. Blume[/caption]
Dr. Christine Blume PhD
Centre for Chronobiology
Psychiatric Hospital of the University of Basel
Transfaculty Research Platform Molecular and Cognitive Neurosciences
Basel
MedicalResearch.com: What is the background for this study?
Response: In modern societies, human rest-activity rhythms and sleep are between the often-conflicting poles of external social time (e.g., work hours and leisure activities) and an individual’s internal biological time. This can lead to so-called “social jetlag”, which has repeatedly been associated with detrimental health effects. With the restrictions to control the pandemic, social timing relaxed as people many started working from home and public life came to a standstill. In an online survey with 435 respondents, we investigated the effects of the phase with the strictest COVID-19 restrictions on the relationship between social and biological rhythms as well as sleep during a six-week period (mid-March until end of April 2020) in three European societies (Austria, Germany, Switzerland).