Simon Marshall, PhD is an Associate Professor of Family and Preventive Medicine at the University of California, San Diego. Born and raised in the United Kingdom and Zambia, Africa, he holds a bachelor’s degree in Sport and Exercise Science, a master’s degree in Kinesiology, and a PhD in Exercise Psychology (Loughborough University, UK). His research interests focus on the objective assessment of physical activity and sedentary behavior, physical activity interventions in the Latino community, and using wireless devices as persuasive technology for health behavior change. He served as Principal Investigator (PI) for Pasos Adelante!, a Spanish language physical activity program funded by the Centers for Disease Control and Prevention (CDC), and currently serves as PI for Academia Fit, a CDC-funded translation study of supervised, grouped based exercise classes offered in public parks and recreation centers. Dr. Marshall is also adjunct research faculty in the Graduate School of Public Health at SDSU. He has authored over 50 publications on physical activity and sedentary behavior and serves on the editorial board of the International Journal of Behavioral Nutrition and Physical Activity.
- Behavioral measurement, particularly the objective assessment of physical activity and sedentary behavior
- Technology-focused interventions to increase physical activity and reduce sedentary behavior
- Community-based interventions to increase physical activity
- Community-based participatory research
- Health disparities, particularly in Mexican-Americans
- Energetics and cancer
- Marshall SJ, & Ramirez E. Reducing sedentary behavior: a new paradigm for physical activity promotion. American Journal of Lifestyle Medicine. e-pub ahead of print February 16, 2011. DOI: 10.1177/1559827610395487
- Nicaise V, Marshall SJ & Ainsworth B. Domain-specific physical activity and self-report bias among low-income Latino women living in San Diego county. Journal of Physical Activity and Health, 8(7), 881-890, 2011.
- Marshall SJ, Levy SS, Tudor-Locke CL, Kolkhorst F, Wooten K, Ji M, et al. Translating physical activity recommendations into a pedometer-based step goal: 3000 steps in 30 minutes. American Journal of Preventive Medicine, 36(5), 410-415, 2009.
- Marshall SJ, Jones DA, Ainsworth BE, Reis JP, Levy S, Macera CA, & Kohl HW. Race/ethnicity and leisure time physical inactivity: moderating effects of social class and occupational physical activity. Medicine & Science in Sports & Exercise, 39(1) 44-51, 2007.
- Marshall SJ, Gorely T, & Biddle SJH. A descriptive epidemiology of youth sedentary behavior: A review and critique. Journal of Adolescence, 29, 333-349, 2006.
- Marshall SJ, Gorely T, Biddle SJH, Cameron N, & Murdey I. Couch kids: Correlates of television viewing among youth. International Journal of Behavioral Medicine, 11(3), 152-163, 2004.
- Marshall SJ, Biddle SJH, Gorely T, Cameron N, & Murdey IM. Relationships between media use, body fatness and physical activity among children and youth: a meta-analysis. International Journal of Obesity, 28, 1238-1246, 2004.
- Marshall SJ, Biddle SJH, Sallis JF, McKenzie TL, & Conway TL. Clustering of sedentary behaviors and physical activity among youth: a cross-national study. Pediatric Exercise Science, 14(4), 401-417, 2002.
- Marshall SJ & Biddle SJH. The transtheoretical model of behaviour change: a meta analysis of applications to physical activity and exercise. Annals of Behavioral Medicine, 23(4), 229-246, 2001.
- Marshall SJ, & Welk GW. Defining and measuring physical activity and inactivity in young people. In: Youth Physical Activity and Inactivity: Challenges and Solutions. Edited by AL Smith & SJH Biddle. Champain: IL; Human Kinetics, Inc., 2008.