Keith Diaz, PhD

Profile Headshot

Overview

Academic Appointments

  • Assistant Professor of Behavioral Medicine (in Medicine and Psychiatry)

Credentials & Experience

Education & Training

  • BS, 2006 Exercise Physiology, William Paterson University
  • PhD, 2012 Integrative Exercise Physiology, Temple University

Research

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.

Research Interests

  • Sedentary Behavior
  • Physical Activity
  • Accelerometry
  • Cardiovascular Biomarkers

Grants

IDENTIFYING EARLY INTERVENTION TARGETS FOR REDUCING CARDIOVASCULAR RISK IN POSTTRAUMATIC STRESS (Federal Gov)

Aug 1 2018 - Jun 30 2023

POOR SLEEP, SEDENTARY BEHAVIOR, AND SECONDARY CARDIOVASCULAR RISK IN STROKE AND TIA PATIENTS (Federal Gov)

May 4 2018 - Mar 31 2023

IMPACT OF PROLONGED SEDENTARY BEHAVIOR ON CARDIAC OUTCOMES AND MORTALITY IN ACUTE CORONARY SYNDROME PATIENTS (Federal Gov)

Jan 1 2017 - Dec 31 2020

TEST OF A NEW THEORY TO EXPLAIN EXCESS RISK IN CARDIAC PTSD (Federal Gov)

Jul 15 2015 - Mar 31 2020

MIDCAREER INVESTIGATOR AWARD IN PATIENT-ORIENTED RESEARCH IN HUMAN HYPERTENSION (Federal Gov)

Feb 1 2015 - Jan 31 2020

TRANSLATIONAL RESEARCH OF NEGATIVE EMOTIONS AND ACUTE ENDOTHELIAL DYSFUNCTION (Federal Gov)

Feb 1 2013 - Jan 31 2020

TESTING BIOPSYCHOSOCIAL MECHANISMS OF THE POSTHOSPITAL SYNDROME MODEL OFEARLY REHOSPITALIZATION IN ACUTE CORONARY SYNDROME PATIENTS (Federal Gov)

Jan 1 2016 - Dec 31 2019

EXERCISE, AGE-RELATED MEMORY DECLINE, AND HIPPOCAMPAL FUNCTION (Federal Gov)

Sep 15 2010 - May 31 2017

EXERCISE, AGING, AND COGNITION: EFFECT AND MECHANISMS (Federal Gov)

Aug 1 2010 - May 31 2017

PSYCHOSOCIAL FACTORS AND CARDIOVASCULAR DISEASE (Federal Gov)

Sep 1 1994 - Feb 28 2017

MIDCAREER MENTORING IN BEHAVIORAL CARDIOLOGY: DEPRESSSION & CARDIOVASCULAR (Federal Gov)

Sep 1 2006 - Jul 31 2016

INCORPORATION OF A HYPERTENSION WORKING GROUP INTO THE JACKSON HEART STUDY (Federal Gov)

Jul 15 2013 - Jun 30 2016

EXERCISE AND INFLAMMATION: AUTONOMIC, AFFECTIVE & CELLULAR MECHANISMS (Federal Gov)

Sep 15 2009 - May 31 2015

PHYSICAL ACTIVITY, DEPRESSION, AND POST-ACS (Federal Gov)

Sep 1 2009 - Jun 30 2014

Selected Publications

  • Diaz KM, Howard V, Hutto B, Colabianchi N, Vena JE, Safford MM, Blair SN, Hooker SP. Patterns of sedentary behavior and mortality in U.S. middle-aged and older adults: A national cohort study. Ann Intern Med. 2017;167(7):465-475.
  • Diaz KM, Goldsmith J, Greenlee H, Strizich G, Qi Q, Mossavar-Rahmani Y, Vidot DC, Buelna C, Brintz CE, Elfassy T, Gallo LC, Daviglus ML, Sotres-Alvarez D, Kaplan R. Prolonged, uninterrupted sedentary behavior and glycemic biomarkers among US Hispanic/Latino adults: The Hispanic Community Health Study/Study of Latinos (HCHS/SOL). Circulation. 2017;136(15):1362-1373. PMCID: PMC5634934
  • Kronish IM, Diaz KM, Goldsmith J, Moise N, Schwartz JE. Objectively measured adherence to physical activity guidelines after acute coronary syndrome. J Am Coll Cardiol. 2017; 69(9):1205-1207. PMCID: PMC5522177 
  • Diaz KM, Booth JN 3rd, Seals SR, Abdalla M, Dubbert PM, Sims M, Ladapo JA, Redmond N, Muntner P, Shimbo D. Physical activity and incident hypertension in African Americans: the Jackson Heart Study. Hypertension. 2017; 69(3):421-427. PMCID: PMC5302780
  • Diaz KM, Booth JN 3rd, Seals SR, Hooker SP, Sims M, Dubbert PM, Muntner P, Shimbo D. Sedentary Behavior and Subclinical Atherosclerosis in African Americans: Cross-sectional Analysis of the Jackson Heart Study. Int J Behav Nutr Phys Act. 2016;13(1):31. PMCID: PMC4772318
  • Diaz KM, Howard VJ, Hutto B, Colabianchi N, Vena JE, Blair SN, Hooker SP. Patterns of sedentary behavior in US middle-aged and older adults: the REGARDS study. Med Sci Sports Exerc. 2016;48(3):430-438. PMCID: PMC4760895 
  • Diaz KM, Krupka DJ, Chang MJ, Peacock J, Ma Y, Goldsmith J, Schwartz JE, Davidson KW. Fitbit: An accurate and reliable device for wireless physical activity tracking. Int J Cardiol. 2015;185:138-140. PMCID: PMC4406840
  • Diaz KM, Booth JN III, Calhoun DA, Irvin MR, Howard G, Safford MM, Muntner P, Shimbo D. Healthy lifestyle factors and risk of cardiovascular events and mortality in treatment-resistant hypertension: the Reasons for Geographic and Racial Differences in Stroke study. Hypertension. 2014;64(3):465-471. PMCID: PMC4134352