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Exercise training hypotension - Implications for plasma volume, renin, and vasopressinThe relation of changes in plasma volume, plasma renin activity and arginine vasopressin to changes in resting blood pressure during exercise training is investigated. Resting supine, sitting, and standing systolic and fifth-phase diastolic blood pressures were measured in ten men before and after an eight-day training period on a cycle ergometer in either a hot (39.8 C) or cool (23.8 C) environment, and compared with plasma volume, renin and vasopressin levels, heart rates, maximal oxygen uptakes, rectal temperatures and sweat rates. Following acclimatization, resting supine and sitting diastolic pressures are observed to decrease by 6 and 9 mm Hg, respectively, while no significant changes are found in the diastolic pressures of the control group or the systolic pressures of either group. Resting plasma volume is found to increase by 12.2% in the controls and by 17.6% after acclimatization following the exercise training. Results suggest that the resting hypotension produced is not attributable to changes in resting plasma volume, renin or vasopressin, although heat acclimatization, which leads to large decreases in plasma volume and increases in vasopressin and renin activity, may be useful in the treatment of hypertension.
Document ID
19810060772
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Greenleaf, J. E.
(NASA Ames Research Center Moffett Field, CA, United States)
Sciaraffa, D.
(NASA Ames Research Center Moffett Field, CA, United States)
Shvartz, E.
(NASA Ames Research Center Moffett Field, CA, United States)
Keil, L. C.
(NASA Ames Research Center Moffett Field, CA, United States)
Brock, P. J.
(NASA Ames Research Center Biomedical Research Div., Moffett Field, CA, United States)
Date Acquired
August 11, 2013
Publication Date
August 1, 1981
Publication Information
Publication: Journal of Applied Physiology: Respiratory
Subject Category
Aerospace Medicine
Accession Number
81A45176
Distribution Limits
Public
Copyright
Other

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