Plasma catecholamines and cardiovascular responses to cold and mental activity

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Abstract
Plasma epinephrine (E) and norepinephrine (NE) and blood pressure and heart rate variations were measured in 12 males before, during and after a cold hand test (5.degree. C for 2 min), a mental arithmetic test and a combination of these tests. Although the cold and mental tests had comparable effects on blood pressure, the heart rate response was greater with 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. Change in heart rate were significantly correlated with E variations but not with NE; changes in blood pressure were correlated with NE. Resting NE was correlated with resting blood pressure and resting E with resting heart rate. The levels of basal E were positively correlated with the increase in E during the test. Cardiovascular changes were differently modified by a mental and a cold test. Apparently these change are related to differences in E and NE responses in the presence of these tests.

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