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Effect of blood volume on sweating rate and body fluids in exercising humans
Abstract
Five relatively fit men performed cycle ergometer exercise (65–70% VO2max) for up to 30 min at 30 degrees C, 40% rh. The data from control (normo-volemic), hypovolemic [8.7% reduction in blood volume (BV) induced by diuretics], and hypervolemic [7.9% expansion of BV induced by infusion if isotonic serum albumin] tests revealed significant effects of BV on body fluid and sweating responses. During control exercise, BV decreased an average (+/- SE) 370 +/- 64 ml at 20 min. A significantly smaller loss occurred after 20 min of hypovolemic exercise (270 +/- 29 ml). The decrease in BV during 30 min of hypervolemic exercise (541 +/- 43 ml) was significantly greater than during control (421 +/- 50 ml). Blood volume reduction also significantly altered the control of sweating rate independent of changes in plasma osmolality. The slope of the sweating rate-to-esophageal temperature relationship (SR/Tes) was significantly reduced from the mean value of 1.07 +/- 0.16 and 1.09 +/- 0.18 mg X min-1 X cm-2 X degrees C-1 during control tests, measured from the chest and arm, respectively, to 0.64 +/- 0.11 and 0.63 +/- 0.11 mg X min-1 X cm-2 X degrees C-1 during hypovolemia. The SR/Tes slope was unchanged in hypovolemia over active tissues (calf). Hypervolemia had no effect on the control of sweating at any site. Both the body fluid and sweating responses during hypovolemia act to conserve circulating blood volume during exercise.
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“Hypovolemia and hyperosmolality delay the onset and decrease the sensitivity of the sweating and skin blood flow responses to hyperthermia [126–128], thus increasing heat storage [125, 129].”
From Fluid Balance in Team Sport Athletes and the Effect of Hypohydration on Cognitive, Technical, and Physical Performance (2017) · cites this paper as [127]
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Cited by
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Sato, K., Kang, W. H., Saga, K., & Sato, K. T. (1989) · Journal of the American Academy of Dermatology · doi:10.1016/s0190-9622(89)70063-3 · Cited by 717
Sawka, M. N., Leon, L. R., Montain, S. J., & Sonna, L. A. (2011) · Comprehensive Physiology · doi:10.1002/cphy.c100082 · Cited by 470
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Cheuvront, S. N., & Kenefick, R. W. (2014) · Comprehensive Physiology · doi:10.1002/cphy.c130017 · Cited by 461
Baker, L. B. (2017) · Sports Medicine · doi:10.1007/s40279-017-0691-5 · Cited by 403
Taylor, N. A. S. (2014) · Comprehensive Physiology · doi:10.1002/cphy.c130022 · Cited by 331
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Wasserman, K. (1994) · American Journal of Physiology-Endocrinology and Metabolism · doi:10.1152/ajpendo.1994.266.4.e519 · Cited by 121
Brooks, E. M., Morgan, A. L., Pierzga, J. M., Wladkowski, S. L., O’Gorman, J. T., Derr, J. A., & Kenney, W. L. (1997) · Journal of Applied Physiology · doi:10.1152/jappl.1997.83.2.477 · Cited by 111
Body Fluid Balance During Heat Stress in Humans
Mack, G. W., & Nadel, E. R. (1996) · Comprehensive Physiology · doi:10.1002/cphy.cp040110 · Cited by 103
Self-citationKlous, L., de Ruiter, C. J., Scherrer, S., Gerrett, N., & Daanen, H. A. M. (2021) · European Journal of Applied Physiology · doi:10.1007/s00421-020-04562-8 · Cited by 86
Thermoregulation during exercise in women who are taking oral contraceptives
Rogers, S. M., & Baker, M. A. (1996) · European Journal of Applied Physiology · doi:10.1007/s004210050123 · Cited by 68
Marino, F. E., Kay, D., & Cannon, J. (2003) · Pflügers Archiv - European Journal of Physiology · doi:10.1007/s00424-003-1058-3 · Cited by 60
Physiological and performance effects of glycerol hyperhydration and rehydration
van Rosendal, S. P., Osborne, M. A., Fassett, R. G., & Coombes, J. S. (2009) · Nutrition Reviews · doi:10.1111/j.1753-4887.2009.00254.x · Cited by 37
Metadata
- Authors
- Fortney, S. M., Nadel, E. R., Wenger, C. B., & Bove, J. R.
- Venue
- Journal of Applied Physiology
- Publisher
- American Physiological Society
- Published
- 1981-12-01
- Volume
- 51
- Issue
- 6
- Pages
- 1594-1600
- ISSN
- 8750-7587
- 1522-1601
- Cited by
- 177
- References
- 0
- Language
- en
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