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J Appl Physiol 83: 11-17, 1997;
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Journal of Applied Physiology
Vol. 83, No. 1, pp. 11-17, July 1997
GAS EXCHANGE, MECHANICS, AND AIRWAYS

Restricted postexercise pulmonary diffusion capacity and central blood volume depletion

Birgitte Hanel, Inge Teunissen, Alan Rabøl, Jørgen Warberg, and Niels H. Secher

Departments of Clinical Physiology, Nuclear Medicine, and Anesthesia, Copenhagen Muscle Research Center, Rigshospitalet, and Department of Physiology, Panum Institute, University of Copenhagen, DK-2100 Copenhagen Ø, Denmark

Received 6 June 1996; accepted in final form 3 February 1997.

Hanel, Birgitte, Inge Teunissen, Alan Rabøl, Jørgen Warberg, and Niels H. Secher. Restricted postexercise pulmonary diffusion capacity and central blood volume depletion. J. Appl. Physiol. 83(1): 11-17, 1997.---Pulmonary diffusion capacity for carbon monoxide (DLCO), regional electrical impedance (Z0), and the distribution of technetium-99m-labeled erythrocytes together with concentration of plasma atrial natriuretic peptide (ANP) were determined before and after a 6-min "all-out" row in nine oarsmen and in six control subjects. Two and one-half hours after exercise in the upright seated position, DLCO was reduced by 6 (-2 to 21; median and range) %, the thoracic-to-thigh electrical impedance ratio (Z0 thorax/Z0 thigh) rose by 14 (-1 to 29) %, paralleled by a 7 (-3 to 11) % decrease and a 3 (-5 to 12) % increase in the thoracic and thigh blood volume, respectively. These responses were associated with a decrease in the plasma ANP concentration from 15 (13-31) to 12 (9-27) pmol/l (P < 0.05). Similarly, in the supine position, Z0 thorax/Z0 thigh increased by 10 (-5 to 28) % when DLCO was reduced 12 (6-26) % (P < 0.05), whereas DLCO remained stable in the control group. The increase in Z0 thorax/Z0 thigh and the corresponding redistribution of the blood volume in both body positions show that approximately one-half of the postexercise reduction of DLCO is explained by a decrease in the pulmonary blood volume. The role of a reduced postexercise central blood volume is underscored by the lower plasma ANP, which aids in upregulating the blood volume after exercise in athletes.

atrial natriuretic peptide; pulmonary blood volume; technetium-99m-labeled erythrocytes; regional electrical impedance


0161-7567/97 $5.00 Copyright © 1997 the American Physiological Society




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