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. 2013 Jun 20;3(6):e002901.
doi: 10.1136/bmjopen-2013-002901.

Sedentary Behaviours and Obesity in Adults: The Cardiovascular Risk in Young Finns Study

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Free PMC article

Sedentary Behaviours and Obesity in Adults: The Cardiovascular Risk in Young Finns Study

I Heinonen et al. BMJ Open. .
Free PMC article

Abstract

Objective: Sedentary behaviour may contribute to the development of obesity. We investigated the relations between different types of sedentary behaviour and adiposity markers in a well-characterised adult population after controlling for a wide range of potential confounders.

Design: Cross-sectional study.

Setting: The Cardiovascular Risk in Young Finns Multicenter Study. Participants Sedentary time (TV viewing, computer time, reading, music/radio listening and other relaxation) was assessed with a questionnaire for 1084 women and 909 men aged 30-45 years. Other study variables included occupational and leisure-time physical activity, sleep duration, socioeconomic status, smoking, alcohol consumption, energy intake, adherence to the recommended diet, multiple individual food items, age and genetic variants associated with body mass index (BMI). Primary outcome measures BMI in kg/m(2) and waist circumference (WC in cm).

Results: Of the different sedentary behaviour types, TV viewing was most consistently related to higher BMI and WC, both in men and women. One additional daily TV hour was associated with a 1.81±0.44 cm larger WC in women and 2 cm±0.44 cm in men (both p<0.0001). The association with TV was diluted, but remained highly significant after adjustments with all measured covariates, including several potentially obesogenic food items associated with TV viewing. The intakes of food items such as sausage, beer and soft drinks were directly associated with TV viewing, while the intakes of oat and barley, fish, and fruits and berries were associated indirectly. After these adjustments, non-TV sedentary behaviour remained associated with adiposity indices only in women.

Conclusions: Out of the different types of sedentary behaviour, TV viewing was most consistently associated with adiposity markers in adults. Partial dilution of these associations after adjustments for covariates suggests that the obesogenic effects of TV viewing are partly mediated by other lifestyle factors.

Keywords: EPIDEMIOLOGY; PREVENTIVE MEDICINE; PUBLIC HEALTH; SPORTS MEDICINE.

Figures

Figure 1
Figure 1
The associations of TV viewing time and non-TV sedentary time and waist circumference (WC) in different multivariable models in women (N=784 in all models) and men (N=675 in all models). *With significant associations to TV viewing in either sex (see online supplementary tables S2 and S3).
Figure 2
Figure 2
Age-adjusted and sex-adjusted waist circumference according to TV viewing (A) and non-TV sedentary time (B) within various MET (metabolic equivalent) index groups (MET index based on leisure time exercise and active commuting). p<0.0001 for trend in TV time in all MET index groups, and p<0.0001, p=0.0015 and p=0.035 for trend in non-TV time in low, moderate and high MET index groups, respectively.

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