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BMJ Open ; 10(3): e035010, 2020 03 25.
Article in English | MEDLINE | ID: mdl-32217565

ABSTRACT

OBJECTIVE: We aimed to examine relationship between hours lying down per day, as a proxy for sedentary behaviour and risk of diabetes in young and middle-aged adults, and to assess if leisure-time physical activity and body mass index (BMI) modified this relationship. DESIGN: A population-based prospective cohort study. SETTING: Nord-Trøndelag, Norway. PARTICIPANTS: The cohort included 17 058 diabetes-free adults, at an age of 20-55 years in 1995-1997, who were followed-up to 2006-2008. PRIMARY OUTCOME MEASURES: Incident diabetes was defined by self-report of diabetes or non-fasting glucose levels greater than 11 mmol/L at the follow-up. METHODS: Multivariable logistic regression models were used to obtain OR with 95% CI for risk of diabetes by the categories of hours lying down (≤7, 8 and ≥9 hours/day). RESULTS: 362 individuals (2.1%) developed diabetes during an average of 11-year follow-up. Individuals who reported lying down ≥9 hours/day had an adjusted OR of 1.35 (95% CI 1.01 to 1.80) for incident diabetes compared with those lying down 8 hours/day. Lying down ≤7 hours/day was not associated with the risk of diabetes. In analysis stratified by physical activity, the ORs associated with lying down ≥9 hours/day were 1.41 (95% CI 1.05 to 1.90) and 0.90 (95% CI 0.23 to 3.55), respectively, among the less active and highly active individuals (pinteraction=0.048). There was little evidence that the association differed by BMI status (pinteraction=0.62). CONCLUSIONS: Prolonged hours lying down per day was associated with an increased risk of diabetes in young and middle-aged adults. The positive association appeared to be modified by physical activity but not by BMI.


Subject(s)
Body Mass Index , Diabetes Mellitus, Type 2/epidemiology , Exercise , Sedentary Behavior , Adult , Age Factors , Alcohol Drinking/epidemiology , Blood Glucose , Female , Humans , Male , Middle Aged , Norway/epidemiology , Obesity/epidemiology , Prospective Studies , Risk Assessment , Risk Factors , Sex Factors , Sleep , Smoking/epidemiology , Socioeconomic Factors , Young Adult
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