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J Appl Physiol 47: 1207-1211, 1979;
8750-7587/79 $5.00
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Journal of Applied Physiology, Vol 47, Issue 6 1207-1211, Copyright © 1979 by American Physiological Society

ARTICLES

Plasma catecholamines and cardiovascular responses to cold and mental activity

J. LeBlanc, J. Cote, M. Jobin and A. Labrie

Plasma epinephrine (E) and norepinephrine (NE) as well as blood pressure and heart rate variations were measured in 12 male subjects before, during, and after a cold hand test (5 degrees C for 2 min), a mental arithmetic test, and a combination of both these tests. Although the cold and mental tests had comparable effects on blood pressure, the heart rate response was greater than the mental test. The mental test produced a greater increase of E than the cold test, but the effect of the cold test was greater on NE than on E. Changes in heart rate were significantly correlated with E variations but not with NE, whereas changes in blood pressure were correlated with NE. Resting NE was correlated with resting blood pressure and resting E with resting heart rate. Finally the levels of basal E were positively correlated with the increase in E during the test. Cardiovascular changes were shown to be differently modified by a mental and a cold test. Evidence was given indicating that these changes are related to differences in E and NE responses in the presence of these tests.


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