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Geoff is a lecturer in Sport and Exercise Science and a member of the Institute for Applied Human Physiology. He recently joined Ïã¸ÛÁùºÏ²Ê¹ÒÅÆ×ÊÁÏ in 2024 after completing postgraduate training in environmental physiology and two postdoctoral fellowships studying the regulation of cerebral blood flow and neuroimaging. Geoff has had the opportunity to practice these areas of expertise around the world (e.g., Peru, Croatia) working with unique populations in various extreme environments (indigenous high altitude populations, free divers). Overall, these experiences have broadened Geoff’s scientific approach where he employs a diverse array of physiological research techniques (transcranial Doppler ultrasound, MRI, thermometry, etc.).

The successful coordination between cardiovascular, respiratory, autonomic, and thermoregulatory systems is essential to physiological homeostasis, particularly in environmentally or physiologically compromised scenarios. Natural (aging) and human-made (climate change) processes can increase the risk of serious health conditions such as heat stroke or cognitive impairment. Geoff’s research program examines the integrative cardiorespiratory aspects of human health and performance. His specific research interests include human health throughout the lifespan and how the environment influences that process – specifically, the human health impacts of climate change as well as the benefits of physical activity on cardiovascular health during the aging process.

Please email me if you are interested in postgraduate or postdoctoral opportunities.

• Postdoctoral Fellowship
  McMaster University, 2022–2024
• Postdoctoral Fellowship
  Western University, Ontario, 2020–2022
• PhD
  University of British Columbia, Okanagan, 2016–2020
• MSc
  University of Ottawa, 2013–2016
• BSc
  University of Ottawa, 2009–2013

Areas of research: 1) cardiovascular and thermoregulatory responses to extreme environments (heat, cold, diving), and 2) cerebrovascular regulation in health and aging. Both themes require an integrative approach assessing multiple organ systems that function to support to regulate thermal and cardiorespiratory homeostasis during combined environmental stressors (e.g., exercise, heat, and pollution), or to maintain cerebral oxygen delivery and therefore neural processes.

2024

• E-pub ahead of print
  Tymko, M. M., Drapeau, A., Vieira-Coelho, M. A., Labrecque, L., Imhoff, S., Coombs, G. B., Langevin, S., Fortin, M., Châteauvert, N., Ainslie, P. N. & Brassard, P., 13 Apr 2024, (E-pub ahead of print) In: Journal of Cerebral Blood Flow and Metabolism. 12 p.
  Research output: Contribution to journal › Article › peer-review
• Published
  Fitzgibbon-Collins, L. K., Coombs, G. B., Noguchi, M., Parihar, S., Hughson, R. L., Borrie, M., Peters, S., Shoemaker, J. K. & Bhangu, J., Jan 2024, In: Cerebral circulation - cognition and behavior. 6, p. 100198
  Research output: Contribution to journal › Article › peer-review

2023

• Published
  D'Souza, A. W., Hissen, S. L., Manabe, K., Takeda, R., Washio, T., Coombs, G. B., Sanchez, B., Fu, Q. & Shoemaker, J. K., 1 Oct 2023, In: American Journal of Physiology - Heart and Circulatory Physiology. 325, 4, p. H917-H932
  Research output: Contribution to journal › Article › peer-review
• Published
  Carr, J. M., Ainslie, P. N., MacLeod, D. B., Tremblay, J. C., Nowak-Flück, D., Howe, C. A., Stembridge, M., Patrician, A., Coombs, G. B., Stacey, B. S., Bailey, D. M., Green, D. J. & Hoiland, R. L., Jan 2023, In: Journal of Cerebral Blood Flow and Metabolism. 43, 1, p. 99-114 16 p.
  Research output: Contribution to journal › Article › peer-review
• Published
  Park, A. J., Fandl, H. K., Garcia, V. P., Coombs, G. B., DeSouza, N. M., Greiner, J. J., Barak, O. F., Mijacika, T., Dujic, Z., Ainslie, P. N. & DeSouza, C. A., 3 Apr 2023, In: Topics in spinal cord injury rehabilitation. 29, 2, p. 34-42 9 p.
  Research output: Contribution to journal › Article › peer-review
• Published
  Hoiland, R. L., MacLeod, D. B., Stacey, B. S., Caldwell, H. G., Howe, C. A., Nowak-Flück, D., Carr, J. M., Tymko, M. M., Coombs, G. B., Patrician, A., Tremblay, J. C., Van Mierlo, M., Gasho, C., Stembridge, M., Sekhon, M. S., Bailey, D. M. & Ainslie, P. N., Sept 2023, In: Journal of Cerebral Blood Flow and Metabolism. 43, 9, p. 1519-1531 13 p.
  Research output: Contribution to journal › Article › peer-review
• Published
  Coombs, G. B., Al-Khazraji, B. K., Suskin, N. & Shoemaker, J. K., 1 Oct 2023, In: Journal of applied physiology (Bethesda, Md. : 1985). 135, 4, p. 753-762 10 p.
  Research output: Contribution to journal › Article › peer-review
• Published
  D'Souza, A. W., Takeda, R., Manabe, K., Hissen, S. L., Washio, T., Coombs, G. B., Sanchez, B., Fu, Q. & Shoemaker, J. K., 15 Jul 2023, In: Journal of Physiology. 601, 14, p. 2877-2898 22 p.
  Research output: Contribution to journal › Article › peer-review

2022

• Published
  Sarafis, Z. K., Squair, J. W., Barak, O. F., Coombs, G. B., Soriano, J. E., Larkin-Kaiser, K. A., Lee, A. H. X., Hansen, A., Vodopic, M., Romac, R., Grant, C., Charbonneau, R., Mijacika, T., Krassioukov, A. V., Ainslie, P. N., Dujic, Z. & Phillips, A. A., 1 Dec 2022, In: American Journal of Physiology - Heart and Circulatory Physiology. 323, 6, p. H1311-H1322
  Research output: Contribution to journal › Article › peer-review
• Published
  Patrician, A., Dawkins, T., Coombs, G. B., Stacey, B., Gasho, C., Gibbons, T., Howe, C. A., Tremblay, J. C., Stone, R., Tymko, K., Tymko, C., Akins, J. D., Hoiland, R. L., Vizcardo-Galindo, G. A., Figueroa-Mujíca, R., Villafuerte, F. C., Bailey, D. M., Stembridge, M., Anholm, J. D., Tymko, M. M. & Ainslie, P. N., Apr 2022, In: Chest. 161, 4, p. 1022-1035 14 p.
  Research output: Contribution to journal › Article › peer-review
• Published
  Soriano, J. E., Romac, R., Squair, J. W., Barak, O. F., Sarafis, Z. K., Lee, A. H. X., Coombs, G. B., Vaseghi, B., Grant, C., Charbonneau, R., Mijacika, T., Krassioukov, A. V., Ainslie, P. N., Larkin-Kaiser, K. A., Phillips, A. A. & Dujic, Z., 3 Mar 2022, In: Applied Physiology, Nutrition, and Metabolism. 47, 3, p. 269-277 9 p.
  Research output: Contribution to journal › Article › peer-review

2021

• Published
  Coombs, G. B., Tremblay, J. C., Shkredova, D. A., Carr, J. M. J. R., Wakeham, D. J., Patrician, A. & Ainslie, P. N., 1 Jan 2021, In: Journal of applied physiology (Bethesda, Md. : 1985). 130, 1, p. 149-159 11 p.
  Research output: Contribution to journal › Article › peer-review
• Published
  Coombs, G. B., Akins, J. D., Patik, J. C., Vizcardo-Galindo, G. A., Figueroa-Mujica, R., Tymko, M. M., Stacey, B. S., Iannetelli, A., Bailey, D. M., Villafuerte, F. C., Ainslie, P. N. & Brothers, R. M., 20 Aug 2021, In: Free radical biology & medicine. 172, p. 451-458 8 p.
  Research output: Contribution to journal › Article › peer-review
• Published
  Caldwell, H. G., Coombs, G. B., Rafiei, H., Ainslie, P. N. & Little, J. P., May 2021, In: Applied Physiology, Nutrition, and Metabolism. 46, 5, p. 521-529 9 p.
  Research output: Contribution to journal › Article › peer-review
• Published
  Coombs, G. B., Cramer, M. N., Ravanelli, N., Imbeault, P. & Jay, O., Jan 2021, In: Experimental Physiology. 106, 1, p. 359-369 11 p.
  Research output: Contribution to journal › Article › peer-review
• Published
  Patrician, A., Spajić, B., Gasho, C., Caldwell, H. G., Dawkins, T., Stembridge, M., Lovering, A. T., Coombs, G. B., Howe, C. A., Barak, O., Drviš, I., Dujić, Ž. & Ainslie, P. N., Apr 2021, In: Experimental Physiology. 106, 4, p. 1120-1133 14 p.
  Research output: Contribution to journal › Article › peer-review
• Published
  Tymko, M. M., Hoiland, R. L., Tremblay, J. C., Stembridge, M., Dawkins, T. G., Coombs, G. B., Patrician, A., Howe, C. A., Gibbons, T. D., Moore, J. P., Simpson, L. L., Steinback, C. D., Meah, V. L., Stacey, B. S., Bailey, D. M., MacLeod, D. B., Gasho, C., Anholm, J. D., Bain, A. R., Lawley, J. S., Villafuerte, F. C., Vizcardo-Galindo, G. & Ainslie, P. N., Jan 2021, In: Experimental Physiology. 106, 1, p. 86-103 18 p.
  Research output: Contribution to journal › Article › peer-review

2020

• Published
  Hoiland, R. L., Tremblay, J. C., Stacey, B. S., Coombs, G. B., Nowak-Flück, D., Tymko, M. M., Patrician, A., Stembridge, M., Howe, C. A., Bailey, D. M., Green, D. J., MacLeod, D. B. & Ainslie, P. N., Oct 2020, In: Journal of Physiology. 598, 19, p. 4225-4236 12 p.
  Research output: Contribution to journal › Article › peer-review
• Published
  Brewster, L. M., Coombs, G. B., Garcia, V. P., Hijmans, J. G., DeSouza, N. M., Stockelman, K. A., Barak, O. F., Mijacika, T., Dujic, Z., Greiner, J. J., Phillips, A. A., Ainslie, P. N. & DeSouza, C. A., 17 Apr 2020, In: Clinical science (London, England : 1979). 134, 7, p. 777-789 13 p.
  Research output: Contribution to journal › Article › peer-review
• Published
  Caldwell, H. G., Coombs, G. B., Howe, C. A., Hoiland, R. L., Patrician, A., Lucas, S. J. E. & Ainslie, P. N., Apr 2020, In: Journal of Physiology. 598, 8, p. 1459-1473 15 p.
  Research output: Contribution to journal › Article › peer-review
• Published
  Carr, J., Stone, R., Tymko, C., Tymko, K., Coombs, G. B., Hoiland, R. L., Howe, C. A., Tymko, M. M., Ainslie, P. N. & Patrician, A., Sept 2020, In: High Altitude Medicine and Biology. 21, 3, p. 297-302 6 p.
  Research output: Contribution to journal › Article › peer-review
• Published
  Gibbons, T. D., Tymko, M. M., Thomas, K. N., Wilson, L. C., Stembridge, M., Caldwell, H. G., Howe, C. A., Hoiland, R. L., Akerman, A. P., Dawkins, T. G., Patrician, A., Coombs, G. B., Gasho, C., Stacey, B. S., Ainslie, P. N. & Cotter, J. D., Jan 2020, In: Journal of Physiology. 598, 2, p. 265-284 20 p.
  Research output: Contribution to journal › Article › peer-review
• Published
  Carr, J. M. J. R., Hoiland, R. L., Caldwell, H. G., Coombs, G. B., Howe, C. A., Tremblay, J. C., Green, D. J. & Ainslie, P. N., Dec 2020, In: Journal of Physiology. 598, 23, p. 5333-5350 18 p.
  Research output: Contribution to journal › Article › peer-review
• Published
  Barak, O. F., Janjic, N., Drvis, I., Mijacika, T., Mudnic, I., Coombs, G. B., Thom, S. R., Madic, D. & Dujic, Z., Feb 2020, In: Canadian journal of physiology and pharmacology. 98, 2, p. 124-130 7 p.
  Research output: Contribution to journal › Article › peer-review

2019

• Published
  Gravel, H., Coombs, G. B., Behzadi, P., Marcoux-Clément, V., Barry, H., Juneau, M., Nigam, A. & Gagnon, D., Jul 2019, In: Physiological Reports. 7, 13, p. e14166
  Research output: Contribution to journal › Article › peer-review
• Published
  Coombs, G. B., Barak, O. F., Phillips, A. A., Mijacika, T., Sarafis, Z. K., Lee, A. H. X., Squair, J. W., Bammert, T. D., DeSouza, N. M., Gagnon, D., Krassioukov, A. V., Dujic, Z., DeSouza, C. A. & Ainslie, P. N., 1 Mar 2019, In: American Journal of Physiology - Heart and Circulatory Physiology. 316, 3, p. H722-H733
  Research output: Contribution to journal › Article › peer-review
• Published
  Coombs, G. B., Vucina, D., Caldwell, H. G., Barak, O. F., Mijacika, T., Lee, A. H. X., Sarafis, Z. K., Squair, J. W., Krassioukov, A. V., Phillips, A. A., Dujic, Z. & Ainslie, P. N., Nov 2019, In: Spinal cord. 57, 11, p. 979-984 6 p.
  Research output: Contribution to journal › Article › peer-review
• Published
  Tremblay, J. C., Hoiland, R. L., Howe, C. A., Coombs, G. B., Vizcardo-Galindo, G. A., Figueroa-Mujíca, R. J., Bermudez, D., Gibbons, T. D., Stacey, B. S., Bailey, D. M., Tymko, M. M., MacLeod, D. B., Gasho, C., Villafuerte, F. C., Pyke, K. E. & Ainslie, P. N., Jun 2019, In: Hypertension (Dallas, Tex. : 1979). 73, 6, p. 1327-1335 9 p.
  Research output: Contribution to journal › Article › peer-review
• Published
  Tremblay, J. C., Coombs, G. B., Howe, C. A., Vizcardo-Galindo, G. A., Figueroa-Mujíca, R. J., Bermudez, D., Tymko, M. M., Villafuerte, F. C., Ainslie, P. N. & Pyke, K. E., 1 Nov 2019, In: American Journal of Physiology - Heart and Circulatory Physiology. 317, 5, p. H991-H1001
  Research output: Contribution to journal › Article › peer-review
• Published
  Coombs, G. B. & Tremblay, J. C., Jan 2019, In: Journal of Physiology. 597, 2, p. 371-372 2 p.
  Research output: Contribution to journal › Article › peer-review
• Published
  Squair, J. W., Lee, A. H. X., Sarafis, Z. K., Coombs, G., Barak, O., Cragg, J. J., Mijacika, T., Pecotic, R., Krassioukov, A. V., Dogas, Z., Dujic, Z. & Phillips, A. A., 10 Dec 2019, In: Neurology. 93, 24, p. e2181-e2191
  Research output: Contribution to journal › Article › peer-review
• Published
  Saleem, S., Sarafis, Z. K., Lee, A. H. X., Squair, J. W., Barak, O. F., Sober-Williams, E., Suraj, R., Coombs, G. B., Mijacika, T., West, C. R., Krassioukov, A. V., Ainslie, P. N., Dujic, Z., Tzeng, Y.-C. & Phillips, A. A., 1 May 2019, In: Journal of Neurotrauma. 36, 9, p. 1487-1490 4 p.
  Research output: Contribution to journal › Article › peer-review
• Published
  Patrician, A., Tymko, M. M., Caldwell, H. G., Howe, C. A., Coombs, G. B., Stone, R., Hamilton, A., Hoiland, R. L. & Ainslie, P. N., Mar 2019, In: High Altitude Medicine and Biology. 20, 1, p. 61-70 10 p.
  Research output: Contribution to journal › Article › peer-review
• Published
  Ravanelli, N., Coombs, G., Imbeault, P. & Jay, O., 1 Oct 2019, In: Journal of applied physiology (Bethesda, Md. : 1985). 127, 4, p. 1095-1106 12 p.
  Research output: Contribution to journal › Article › peer-review

2018

• Published
  Brugniaux, J. V., Coombs, G. B., Barak, O. F., Dujic, Z., Sekhon, M. S. & Ainslie, P. N., 1 Jul 2018, In: American Journal of Physiology - Regulatory Integrative and Comparative Physiology. 315, 1, p. R1-R27
  Research output: Contribution to journal › Review article › peer-review
• Published
  Ravanelli, N., Coombs, G. B., Imbeault, P. & Jay, O., Feb 2018, In: Medicine and Science in Sports and Exercise. 50, 2, p. 299-307 9 p.
  Research output: Contribution to journal › Article › peer-review
• Published
  Caldwell, H. G., Coombs, G. B., Tymko, M. M., Nowak-Flück, D. & Ainslie, P. N., 1 May 2018, In: Physiology and Behavior. 188, p. 262-269 8 p.
  Research output: Contribution to journal › Article › peer-review
• Published
  Hoiland, R. L., Howe, C. A., Coombs, G. B. & Ainslie, P. N., Aug 2018, In: Clinical Autonomic Research . 28, 4, p. 423-435 13 p.
  Research output: Contribution to journal › Review article › peer-review
• Published
  Saleem, S., Vucina, D., Sarafis, Z., Lee, A. H. X., Squair, J. W., Barak, O. F., Coombs, G. B., Mijacika, T., Krassioukov, A. V., Ainslie, P. N., Dujic, Z., Tzeng, Y.-C. & Phillips, A. A., 1 May 2018, In: American Journal of Physiology - Heart and Circulatory Physiology. 314, 5, p. H1108-H1114
  Research output: Contribution to journal › Article › peer-review

2017

• Published
  Lee, A. H. X., Phillips, A. A., Squair, J. W., Barak, O. F., Coombs, G. B., Ainslie, P. N., Sarafis, Z. K., Mijacika, T., Vucina, D., Dujic, Z. & Krassioukov, A. V., 28 Dec 2017, In: Spinal cord series and cases. 3, 17101.
  Research output: Contribution to journal › Article › peer-review
• Published
  Coombs, G. B., Cramer, M. N., Ravanelli, N., Imbeault, P. & Jay, O., 1 May 2017, In: Journal of applied physiology (Bethesda, Md. : 1985). 122, 5, p. 1198-1207 10 p.
  Research output: Contribution to journal › Article › peer-review

2016

• Published
  Dervis, S., Coombs, G. B., Chaseling, G. K., Filingeri, D., Smoljanic, J. & Jay, O., 15 Mar 2016, In: Journal of applied physiology (Bethesda, Md. : 1985). 120, 6, p. 615-23 9 p.
  Research output: Contribution to journal › Article › peer-review
• Published
  Morris, N. B., Coombs, G. & Jay, O., Jan 2016, In: Medicine and Science in Sports and Exercise. 48, 1, p. 114-22 9 p.
  Research output: Contribution to journal › Article › peer-review

2015

• Published
  Coombs, G. B., Cramer, M. N., Ravanelli, N. M., Morris, N. B. & Jay, O., Jun 2015, In: Scandinavian Journal of Medicine and Science in Sports. 25 Suppl 1, p. 96-103 8 p.
  Research output: Contribution to journal › Article › peer-review
• Published
  Coombs, G. B., Stamatakis, E. & Jay, O., Jul 2015, In: European Journal of Applied Physiology. 115, 7, p. 1601-2 2 p.
  Research output: Contribution to journal › Article