Tid i sengen og risiko for fedme i ungdomsårene

Redusert søvnlengde er assosiert med fedme hos barn, men få studier har undersøkt om dette vedvarer når barnet blir ungdom. Forskere fra Universitetet i Bergen, Nasjonal kompetansetjeneste for søvnsykdommer, Folkehelseinstituttet, NTNU og NORCE har i denne studien undersøkt sammenhengen mellom tid i sengen (TIB) på hverdager hos barn i alderen 10-13 år og overvekt i alderen 16-19 år. 3025 familier fra Barn i Bergen undersøkelsen svarte på spørreskjemaer om sengetid og våkentid på hverdager, vekt og høyde, sosioøkonomisk status, psykiske problemer og matvaner. Forskerne undersøkte sammenhengen mellom TIB ved 10-13 årsalder og vekt 6 år senere. Studien viste at kort TIB var en prediktor for vektøkning i ungdomsårene. Funn i studien innebærer at etablering av sunne søvnvaner bør vektlegges i forebygging- og behandlingsstrategier mot ungdomsfedme.




Yngvild Sørebø Danielsen, Ståle Pallesen, Børge Sivertsen, Kjell Morten Stormark, Mari Hysing

Studien er publisert i Obesity Science and Practice

Introduction: Sleep curtailment is associated with obesity in children, but few studies have investigated this relationship in a longitudinal sample of adolescents. The aim of the present study was to examine the longitudinal association between weekday time in bed (TIB) at age 10-13 and overweight at age 16-19.
Methods: Adolescents and their parents (N = 3025 families), participating in a longitudinal population-based study, completed questionnaires assessing habitual bedtime and wake time on weekdays, weight and height, socioeconomic status (SES), internalizing mental health problems and disturbed eating. Two surveys were administered with a 6-year interval (T1 and T2). A one-way analysis of covariance (ANCOVA) was performed examining the association between TIB and weight category 6 years later, with SES, internalizing problems and disturbed eating at baseline entered as covariates. Hierarchical and logistic regression analyses were used to assess TIB at age 10-13 years to as a predictor of body mass index (BMI) standardized deviation scores (SDS) and overweight status at age 16-19 adjusting for the same confounders and baseline BMI.
Results: A linear inverse relationship between TIB at age 10-13 and BMI category at age 16-19 was demonstrated by the ANCOVA, p < 0.001. Shorter TIB was related to higher weight, but the effect size was small (partial eta squared = 0.01). When adjusting for the included baseline confounders in the hierarchical regression model TIB significantly predicted later BMI SDS (β = -0.039, p = 0.02). The adjusted logistic regression model showed that for each hour reduction of TIB at T1 the odds of being overweight/obese at T2 increased with a factor of 1.6.
Conclusion: Shorter TIB was found to be a significant, yet modest, independent predictor of later weight gain in adolescence. The findings implicate that establishing healthy sleep habits should be addressed in prevention and treatment strategies for adolescent obesity.