Sedentary behaviors have been associated with weight status and health and disease risks in children and adults. Previously, sedentary behaviors have been defined as screen-related behaviors (i.e., television watching and computer use) performed during leisure time. Recently, the definition of sedentary behaviors has broadened to include breaks from activity and behaviors that do not substantially increase energy expenditure above that which occurs at rest (i.e., sitting). The mechanisms by which sedentary behaviors, specifically different types and doses of sedentary behaviors, impact weight and health and disease risks have not been well defined. The best methods to reduce sedentary behaviors, especially in adults, are not known, and the impact of reducing sedentary behaviors on weight and health and disease risks is not clear in many populations. Finally, when the time spent in sedentary behaviors is reduced, choices that are made with the reallocation of that newly found free time are unknown (i.e., are sedentary behaviors exchanged for other behaviors that have a higher energy expenditure?).

We are interested in papers that explore the many unresolved issues pertaining to sedentary behaviors, weight, and health and disease risks in children and adults. We invite investigators to contribute original research as well as review articles that will further broaden the understanding of the relationship between sedentary behaviors and weight and health. Potential topics include, but are not limited to:

• Developing methods for measuring sedentary behaviors
• Examining relationships between the broader definitions of sedentary behaviors and weight and health
• Investigating physiological pathways mediating how sedentary behaviors affect health
• Examining relationships between sedentary behaviors and other behaviors related to energy balance
• Identifying factors about television viewing, and potentially other sedentary behaviors, that influence food consumption
• Testing methods to reduce sedentary behaviors
• Intervening on sedentary behaviors and the impact on weight and health and disease risks

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