1. Healthy Aging Research Network Mobility Work Group: Definition

2. Total Energy Expenditure 1 Thermic Effect of Food 20% 10% 70% Variable Physical Activity Basal Metabolic Rate 1 Ravussin E & Swinburn BA. 1992 24 Casperson CJ et al. 1985 Any bodily movement that results in energy expenditure 2

3. Variable Physical Activity Leisure Occupational Transportation to and from work Activities of daily living Kriska AM & Caspersen CJ. 2005

4. Proposal: Variable PA = Mobility Leisure Activity: Includes recreation, sports, play, exercise, walking for leisure Occupational Activity: Includes paid and unpaid (student, homemaker, retired, disabled, unemployed, volunteer) Active and Passenger Transportation: Includes driving and public transportation Activities of Daily Living: Includes ADLs, IADLs, gait, and transfers Within context of the environment & social roles