Dr. Jennifer Schrack is Assistant Professor of Epidemiology at Johns Hopkins Bloomberg School of Public Health (JHSPH). Dr. Schrack holds a joint position with the Krieger School of Arts and Sciences, and she is affiliated with several Centers including the Center for AIDS Research, the Johns Hopkins Center on Aging and Health, the Multicenter AIDS Cohort Study, and the Welch Center for Prevention, Epidemiology and Clinical Research.
Dr. Schrack's primary area of research is the epidemiological assessment of physical activity and its associations with health and longevity in older populations. In collaboration with the SMART group from the JHSPH Department of Biostatistics, Dr. Schrack is working to establish methods to analyze and translate heart rate and accelerometry data into accurate and reliable measures of physical activity in older populations. In recognition of these efforts, Dr. Schrack was recently awarded a 2017 Johns Hopkins University Catalyst Award and a U01 from the National Institute on Aging.
Recent Publications
- Tilves, C, Holingue, C, Wanigatunga, SK, Chia, CW, Zhao, N, Wu, MN, Schrack, JA, Simonsick, EM, Ferrucci, L, Tanaka, T et al.. Associations of self-reported and actigraphic sleep with gut microbiome composition and diversity among older adults. Sleep 2026; : . PubMed PMID:42570316 .
- Moradi, K, Hadidchi, R, Majbri, A, Hughes, TM, Lu, H, Zhu, Y, Mohammadi, S, Momtazmanesh, S, Mukherjee, P, Abdullah, M et al.. Temporalis muscle biomarkers from routine brain MRI and risk of dementia in two independent cohorts. Alzheimers Dement 2026; 22 (8): e71622. PubMed PMID:42559821 PubMed Central PMC13445788.
- Ma, W, Filigrana, P, Kaplan, RC, Kim, RS, Cordero, C, Daviglus, ML, Gallo, LC, Amezcua, PM, Matsushita, K, Pirzada, A et al.. Socioeconomic mobility and the prevalence and incidence of difficulties in daily living in US Hispanic/Latino adults. Ann Epidemiol 2026; 122 : 110238. PubMed PMID:42498144 .
- Lamoureux, NR, Saavedra, JM, Downer, B, Schrack, JA, Wanigatunga, AA. Physical activity fragmentation and functional decline among older adults: findings from the National Health and Aging Trends Study. J Gerontol A Biol Sci Med Sci 2026; 81 (9): . PubMed PMID:42423287 .
- Alver, SK, Cuthbertson, CC, Evenson, KR, Schrack, JA, Sotres-Alvarez, D, Anita, NZ, Mossavar-Rahmani, Y, Gallo, LC, Carlson, JA, Allison, M et al.. Non-Vigorous Physical Activity Associated with Reduced Hospitalization Risk with or without Diabetes or Peripheral Artery Disease: Study of Latinos. Med Sci Sports Exerc 2026; 58 (9): 2007-2019. PubMed PMID:42350300 PubMed Central PMC13446917.
- Stamatakis, E, Koemel, NA, Mitchell, JJ, Atkin, AJ, Pulsford, R, Chong, KH, Rangul, V, Blodgett, JM, Biswas, RK, Celis-Morales, CA et al.. Prospective Physical Activity, Sitting and Sleep consortium (ProPASS): addressing methodological and geographical barriers to inform global public health guidelines, interventions and precision medicine. Br J Sports Med 2026; : . PubMed PMID:42331598 .
- Martinez-Amezcua, P, Zhang, W, Dooley, EE, Hornikel, B, Pompeii, L, Evenson, KR, Rippon, B, Windham, BG, Mosley, TH, Schrack, JA et al.. Accelerometer-derived daily steps, cognition, and cognitive impairment in U.S. community-dwelling older adults: The Atherosclerosis Risk in Communities Study. Alzheimers Dement (N Y) 2026; 12 (2): e70252. PubMed PMID:42318286 PubMed Central PMC13272101.
- Callow, D, Rabinowitz, JA, Zhou, X, Chen, X, Dougherty, R, Crainiceanu, C, Etzkorn, L, Wanigatunga, AA, Wanigatunga, SK, Spira, AP et al.. Associations of accelerometry-derived time in major activity intensities with cognitive outcomes: a compositional data analysis approach. J Gerontol A Biol Sci Med Sci 2026; 81 (7): . PubMed PMID:42268661 PubMed Central PMC13316422.
- Hiser, SL, Chittal, A, Diener-West, M, Schrack, JA, Needham, DM. Intensity of physical therapy interventions in the intensive care unit: An exploratory analysis. Aust Crit Care 2026; 39 (4): 101611. PubMed PMID:42208416 PubMed Central PMC13245384.
- Windham, BG, Sylvester, HC, Henegan, J, McMullan, M, Kucharska-Newton, A, Palta, P, Schrack, JA, Mosley, TH Jr, Bandeen-Roche, K, Griswold, ME et al.. Examining the relevance of gait speed resiliencies to different stressors: the ARIC Study. J Gerontol A Biol Sci Med Sci 2026; 81 (8): . PubMed PMID:42152189 PubMed Central PMC13403272.
