Center for Behavioral Cardiovascular Health
Keith Diaz, PhD
Keith Diaz, PhD is a certified exercise physiologist and Assistant Professor of Behavioral Medicine at Columbia University Medical Center. He is Director of the Exercise Testing Laboratory at the Center for Behavioral Cardiovascular Health. He conducts laboratory- and observational-based research to elucidate the role of prolonged sedentary behavior in the pathogenesis of cardiovascular disease, with a specific focus of iteratively optimizing feasible, sustainable, and cost-effective guidelines for reducing prolonged sitting. He is currently PI of a prospective cohort study examining objectively-measured sedentary behavior as a risk factor for recurrent cardiovascular outcomes in coronary heart disease patients. He is also PI of laboratory-based, cross-over trial examining the optimal frequency and duration of sedentary breaks for improving cardiometabolic health. Dr. Diaz is also interested in the objective measurement of physical activity and sedentary behavior via accelerometry. He has conducted laboratory-based studies testing the validity and reliability of wireless physical activity monitors including the Fitbit One and Fitbit Flex. Dr. Diaz’s past work has involved studying the effects of aerobic exercise training on endothelial health in sedentary African Americans. Findings from this work included the observation that aerobic exercise training elicited robust reductions in circulating endothelial microparticles; the first study to demonstrate a favorable effect of a lifestyle intervention on circulating endothelial microparticles. His work has been featured by the New York Times, CNN, CBS News, and the Guardian, among many others.

Clinical Studies Managed By This Investigator:
Condition Study Title
Healthy Volunteers [ CLOSED ] Sitting Reduction Study
Healthy Volunteers The BREAK II Study: Breaking up Prolonged Inactivity to Improve Cardiometabolic Health