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Television time and continuous metabolic risk in physically active adults
Genevieve N Healy1, David W Dunstan, Jo Salmon
1School of Population Health, University of Queensland, Brisbane, Australia. g.healy@uq.edu.au
Medicine and Science in Sports and Exercise
|March 5, 2008
Summary
Even with sufficient physical activity, increased television viewing is linked to higher metabolic risks in Australian adults. This highlights the need for sedentary behavior guidelines alongside physical activity recommendations.
Area of Science:
- Public health and preventive medicine
- Metabolic health and cardiovascular risk factors
- Epidemiology of lifestyle behaviors
Background:
- Physical activity guidelines aim to improve health, but sedentary behaviors like television viewing may independently impact metabolic health.
- Understanding the relationship between television viewing and metabolic risk is crucial for comprehensive health promotion strategies.
- Previous research has not fully elucidated these associations in populations meeting minimum physical activity requirements.
Purpose of the Study:
- To investigate the dose-response relationship between television viewing time and metabolic risk variables in Australian adults.
- To examine these associations among individuals who already meet public health guidelines for physical activity.
- To explore potential gender differences in the associations between television viewing and metabolic health.
Main Methods:
- Cross-sectional analysis of 4064 Australian adults (aged ≥25 years) from the 1999-2000 Australian Diabetes, Obesity and Lifestyle study.
- Participants reported minimum 2.5 hours/week of moderate- to vigorous-intensity physical activity; individuals with diabetes or heart disease were excluded.
- Metabolic variables (waist circumference, blood pressure, plasma glucose, triglycerides, HDL-C) were assessed against television viewing time, adjusting for covariates.
Main Results:
- Higher television viewing time was significantly associated with adverse metabolic outcomes, including increased waist circumference, systolic blood pressure, and 2-hour plasma glucose in both genders.
- Detrimental associations were also observed for fasting plasma glucose, triglycerides, and HDL-C in women, with stronger effects noted in women compared to men.
- These associations persisted even after adjusting for waist circumference, indicating an independent effect of television viewing on metabolic risk.
Conclusions:
- Television viewing time is positively associated with multiple metabolic risk factors in healthy Australian adults who meet physical activity guidelines.
- Findings suggest that reducing sedentary time, specifically television viewing, is important for metabolic health, irrespective of physical activity levels.
- The study supports the development of concurrent sedentary behavior guidelines for adults, complementing existing physical activity recommendations.
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