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J Appl Physiol 77: 1659-1665, 1994;
8750-7587/94 $5.00
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Journal of Applied Physiology, Vol 77, Issue 4 1659-1665, Copyright © 1994 by American Physiological Society

ARTICLES

Effect of regional circulation patterns on observed HbCO levels

M. V. Smith, M. J. Hazucha, V. A. Benignus and P. A. Bromberg
MVS Biomathematics, Raleigh 27603.

In an earlier experiment, we briefly exposed 15 young men to high levels of CO while simultaneously monitoring arterial and peripheral venous HbCO levels. The arterial HbCO levels were considerably higher than the venous levels during the CO exposure. Furthermore, great variation in the difference between arterial and venous HbCO levels was observed, with the maximal difference for each subject ranging from 2.3 to 12.1% HbCO. In the present paper, we suggest an explanation for the observed differences between arterial and venous HbCO on the basis of the regional circulation of the forearm, where both samples were taken. Because regional circulation patterns are known to vary with physical training, the differences in physical training between subjects may account for the observed variation. An expanded model was derived from the Coburn-Forster-Kane equation, which reflects the above hypothesis. Most of the parameter values for the expanded model were measured on individual subjects. Literature values were used for other parameters. Two parameters were estimated using five of the subjects and were then used in the predictions of the expanded model for the remaining subjects.


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