Scandiffio, J. A., & Janssen, I. et al | 2021| Do adolescent sedentary behavior levels predict type 2 diabetes risk in adulthood? | BMC Public Health | 21| 969
This longitudinal study builds on the work of a previous study which looked at sedentary behaviour in adolescence to determine whether this predicts type 2 diabetes. The purpose of this study was to determine whether different levels of both screen-based and non-screen based sedentary behaviours during adolescence are associated with the risk of developing type 2 diabetes in adulthood. They studied these associations using data from the 970 British Cohort Study with assessments of sedentary behaviour at age 16 and a subsequent 30-year follow-up for incident cases of type 2 diabetes.
The research team observed that 16-year-olds who watched TV and videos for more than 4 h/day had a twofold increased risk for developing type 2 diabetes over the next three decades
Time spent using a computer, doing homework, and reading at age 16 were not associated with type 2 diabetes risk.
The objective was to determine whether time spent in different types of sedentary behavior during adolescence are associated with the risk of developing type 2 diabetes in adulthood.
Participants were 3 942 adolescents aged 16 years who were part of the 1970 British Cohort Study. Sedentary behavior was assessed using a questionnaire that asked participants to indicate how much time they spent watching TV and videos, using the computer, reading, and doing homework. Incident cases of type 2 diabetes were determined quadrennially until 46 years of age. The association between adolescent sedentary behaviors and type 2 diabetes was determined using Cox proportional hazards regression that controlled for sex, body mass index, sugary beverage consumption, smoking status, physical activity at baseline, and physical activity in adulthood .
There were 91 incident cases of type 2 diabetes with an incidence rate of 9 cases/10,000 person-years. By comparison to those who watched TV and videos for 2 or less hours/day, type 2 diabetes risk was not different in those who watched for 2.1–4.0 h/day (HR equal to 0.89, 95 per cent CI equal to 0.54, 1.47) but was increased by 2.06-fold (95 per cent CI equal to 1.24, 3.43) in those who watched for more than 4 h/day. Time spent using a computer, reading, and doing homework were not significantly associated with type 2 diabetes.
Spending more than 4 h/day watching television and videos at age 16 was associated with an increased risk of type 2 diabetes. Conversely, using a computer and non-screen based sedentary behaviors were not associated with type 2 diabetes risk.