α-Amylase is one of the most important proteins in saliva, where it catalyses the breakdown of starch into sugars and exerts its anti-bacterial function. It is produced in the saliva glands and its secretion is regulated by the sympathetic nervous system.
Salivary α-Amylase activity acts as a stress indicatorStudies show that the secretion of salivary α-Amylase is associated with the production of plasma noradrenalin. Therefore, salivary α-Amylase may act as a sensitive biomarker for stress-related changes in the body that reflect the activity of the sympathetic nervous system.
The secretion of salivary -amylase is different from that of cortisol, which is more a marker of the hypothalamus-adrenal axis. Concomitant measurement of -amylase and cortisol activity in saliva may contribute to a more comprehensive evaluation of stress responses.
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