Abstract
Plasma arginine vasopressin (pAVP) was determined by radioimmunoassay in healthy male subjects under two types of standardized and reproducible stress conditions: ischaemic muscle pain and a mental task. In addition, forearm blood flow, a sensitive indicator of emotional stress, and heart rate were measured. Ischaemic muscle pain induced a pronounced increase of pAVP. In striking contrast, the mental task consisting of the Stroop colour-word test and mental arithmetic did not cause a significant change of pAVP. Heart rate accelerated during both experimental procedures, whereas forearm blood flow remained unchanged during ischaemic muscle pain, but increased during the mental task.
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