Journal of Applied Physiology
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J Appl Physiol 50: 1255-1262, 1981;
8750-7587/81 $5.00
This Article
Right arrow Full Text (PDF)
Right arrow Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when eLetters are posted
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by van Beaumont, W.
Right arrow Articles by van Beaumont, S.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by van Beaumont, W.
Right arrow Articles by van Beaumont, S.

Journal of Applied Physiology, Vol 50, Issue 6 1255-1262, Copyright © 1981 by American Physiological Society

ARTICLES

Erythrocyte volume, plasma volume, and acid-base changes in exercise and heat dehydration

W. van Beaumont, S. Underkofler and S. van Beaumont

Variations in erythrocyte volume [mean corpuscular volume (MCV)] were evaluated during exercise and heat stress to determine the influence on calculated plasma volume and content changes. The results of this study on 17 men indicate that the human red blood cell can increase, decrease, or remain constant in volume during physical stress depending on the combined interactions of plasma osmolality and blood pH. Shrinking of MCV can occur when the increase in plasma osmolality is larger than 5 mosmol/kg H2O and the blood pH remains within 0.1 pH units of its resting value. Erythrocyte swelling is usually noticed with maximal exercise when the blood pH is less than 7.10, in spite of 20 mosmol/kg H20 increments in plasma osmolality. The regression equations indicate that during 30 min of exercise in a cool environment the plasma shifts calculated by either the hematocrit or the hematocrit + hemoglobin method fall within 1% of each other, but during resting heat exposure the hematocrit technique under-estimates the fluid shift by 2.5-3.0%. Application of these considerations to the calculation of plasma content changes during stress made it clear that the pattern of plasma potassium content is quite different with maximal as compared with submaximal exercise.


This article has been cited by other articles:


Home page
 J. Physiol.Home page
M. Vengust, H. Staempfli, L. Viel, and G. Heigenhauser
Transvascular fluid flux from the pulmonary vasculature at rest and during exercise in horses
J. Physiol., January 15, 2006; 570(2): 397 - 405.
[Abstract] [Full Text] [PDF]

Home page
 Br. J. Sports. Med.Home page
J E Smith, G Garbutt, P Lopes, and D T. Pedoe
Effects of prolonged strenuous exercise (marathon running) on biochemical and haematological markers used in the investigation of patients in the emergency department
Br. J. Sports Med., June 1, 2004; 38(3): 292 - 294.
[Abstract] [Full Text] [PDF]

Home page
 Am. J. Respir. Crit. Care Med.Home page
T. Vassilakopoulos, P. Katsaounou, M.-H. Karatza, A. Kollintza, S. Zakynthinos, and C. Roussos
Strenuous Resistive Breathing Induces Plasma Cytokines: Role of Antioxidants and Monocytes
Am. J. Respir. Crit. Care Med., December 15, 2002; 166(12): 1572 - 1578.
[Abstract] [Full Text] [PDF]

Home page
 J. Am. Coll. Nutr.Home page
J. S. Volek, A. L. Gomez, and W. J. Kraemer
Fasting Lipoprotein and Postprandial Triacylglycerol Responses to a Low-Carbohydrate Diet Supplemented with n-3 Fatty Acids
J. Am. Coll. Nutr., June 1, 2000; 19(3): 383 - 391.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
G. Saab, R. T. Thompson, and G. D. Marsh
Effects of exercise on muscle transverse relaxation determined by MR imaging and in vivo relaxometry
J Appl Physiol, January 1, 2000; 88(1): 226 - 233.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Visit Other APS Journals Online