Saurabh S. Thosar, Ph.D., M.S., OTR/L

  • Assistant Professor, Oregon Institute of Occupational Health Sciences


Saurabh received a B.O.Th in Occupational Therapy from Maharashtra University of Health Science in India, an M.S. in Movement Sciences from the Univ. of Illinois Chicago, and a Ph.D. in Human Performance (Physiology) from Indiana Univ. Bloomington. He is a certified clinical exercise specialist and licensed occupational therapist. Saurabh joined Dr. Shea's group as a postdoctoral fellow in January 2014 and has received a fellowship from the National Space Biomedical Research Institute, an early clinical investigator award from the Medical Research Foundation of Oregon, and a postdoctoral fellowship from the National Institutes of Health. Dr. Thosar studies the interactions between sleep, circadian rhythms and physical inactivity/activity as they relate to cardiovascular disease; and the development of chronotherapeutic countermeasures to cardiovascular risks in vulnerable populations.

Education and training

    • M.S., 2007, University of Illinois
    • Ph.D., 2014, Indiana University
  • Fellowship

    • First award fellowship from the National Space Biomedical Research Association 10/01/2015-06/30/2016 **Relinquished to accept NIH/NHLBI F32 award
    • Ruth L. Kirschstein National Research Service Award (NRSA) Individual Postdoctoral Fellowship (Parent F32) from NHLBI/NIH 06/05/2016-06/04/2018
    • Early career Investigator grant from Medical Research Founcation of Oregon 09/01/2015-08/31/2016
  • Certifications

    • Clinical Exercise Specialist American College of Sports Medicine 2007
    • Occupational Therapist National Board for Certification in Occupational Therapy 2007
    • Occupational Therapist Licensed in the State of Oregon 2014

Memberships and associations:

  • All India Occupational Therapy Association (AIOTA) Life Member
  • ‘GOSUMEC’, Seth. G. S. Medical College, India Life Member
  • Sleep Research Society 2014- Present
  • American Heart Association 2017- Present
  • American College of Sports Medicine 2005- Present
  • Society for Research on Biological Rhythms 2014- Present

Areas of interest

  • Inactivity and exercise physiology
  • vascular function assessment
  • circadian rhythms
  • cardiovascular disease research
  • occupational and public health
  • chronotherapeutics

Honors and awards

  • Travel Award for Outstanding Abstract Sleep Research Society, 2016
  • Best (first place) oral scientific presentation OHSU Research week, 2016
  • Travel Award Implementation Science Workshop-Sleep Research Society, 2015
  • Young Investigator Forum awardee American Academy of Sleep Medicine/NIH, Bethesda, MD, 2015


Selected publications

  • Thosar, S. S., Berman, A. M., Herzig, M. X., McHill, A. W., Bowles, N. P., Swanson, C. M., Clemons, N. A., Buteler, M. P., Clemons, A. A, Emens, J. S., Shea, S. A. (2019). Circadian rhythms of vascular function in mid-life adults. Atherosclerosis, Thrombosis, and Vascular Biology. 39(6):1203-1211
  • Thosar, S. S., Rueda, J. F., Berman, A. M., Lasarev, M. R., Herzig, M. X., Clemons, N. A., Roberts, S. A., Bowles, N. P., Emens, J. S., Ellison, D. H., Shea, S. A. (2019). Separate and interacting effects of the endogenous circadian system and behaviors on plasma aldosterone in humans. American Journal of Physiology-Regulatory, Integrative and Comparative Physiology. 316(2):R157-R164. PMID: 30521366
  • Thosar, S. S., Berman, A. M., Herzig, M. X., Roberts, S. A., Lasarev, M. R., Shea, S. A. (2018). Morning impairment in vascular function is unrelated to overnight sleep or the inactivity that accompanies sleep. American Journal of Physiology-Regulatory, Integrative and Comparative Physiology. 315: R986
  • Thosar, S. S., Herzig, M. X., Roberts, S. A., Berman, A. M., Clemons, N. A., McHill, A. W., Bowles, N. P., Morimoto, M., Butler, M. P., Emens, J. S., Shea, S. A. (2018). Lowest perceived exertion in the late morning due to effects of the endogenous circadian system. British Journal of Sports Medicine. Aug; 52(15):1011-1012. PMID: 29475839
  • Thosar, S. S., Niederhausen, M., Lapidus, J., et al. (2018). Self-regulated use of a wearable activity sensor is not associated with improvements in physical activity, cardiometabolic risk or subjective health status. British Journal of Sports Medicine. Sep; 52(18):1217-1218. PMID: 29222201
  • Bowles, N. P., Thosar, S. S., Herzig, M. X., Shea, S.S. (2018). Chronotherapy for Hypertension. Current Hypertension Reports; Sep 28; 20(11): 97. PMID: 30267334
  • Thosar, S. S., Butler, M. P., Shea, S.A. (2018). Role of the circadian system in cardiovascular disease: a double-edged sword. Journal of Clinical Investigation, 128(6):2157-2167. PMID: 29856365
  • Parthasarathy, S., Carskadon, M. A., Jean-Louis, G., Owens, J., Bramoweth, A., Combs, D., Hale, L., Harrison, E., Hart, C. N., Hasler, B. P., Honaker, S. M., Hertenstein, E., Kuna, S., Kushida, C., Levenson, J. C., Murray, C., Pack, A. I., Pillai, V., Pruiksma, K., Seixas, A., Strollo, P.,Thosar, S. S., Williams, N., Buysse, D. (2016). Implementation of Sleep and Circadian Science: Recommendations from the Sleep Research Society and National Institutes of Health Workshop.
  • Thosar S. S., Wiggins, C. C., Shea, S. A, Wallace, J. P. (2015). Brachial artery endothelial function is stable across the morning hours in young men. Cardiovascular Ultrasound. 13: 42. PMID: 26438100
  • Thosar, S., Bielko, S., Mather, K., Johnston, D., Wallace, J. (2015). Effect of prolonged sitting and breaks in sitting time on endothelial function. Medicine and Science in Sports and Exercise. 47(4):843-849. PMID: 25137367


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