Plasma dopamine responses to standing and exercise in man |
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| Authors: | G R Van Loon L Schwartz M J Sole |
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| Institution: | University of Toronto Department of Medicine Clinical Science Division Toronto, Ontario, Canada M5A 1A8 |
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| Abstract: | Increases in plasma concentration of dopamine in response to standing are comparable to those observed for norepinephrine and epinephrine. Also, bicycle exercise to maximum heart rate produced 1.5 to 2.5-fold increases above basal plasma concentrations in each of the three catecholamines. Thus, maneouvres which are associated with increases in sympathetic activity are associated with parallel increases in each of the three catecholamines. However, the origin and significance of plasma dopamine remain unknown. |
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