A fluid response: Alpha-amylase reactions to acute laboratory stress are related to sample timing and saliva flow rate.
Salivary alpha-amylase (sAA) is used as a sympathetic (SNS) stress marker, though its release is likely co-determined by SNS and parasympathetic (PNS) activation. The SNS and PNS show asynchronous changes during acute stressors, and sAA responses may thus vary with sample timing. Thirty-four participants underwent an eight-minute memory task (MT) and cold pressor task (CPT). Cardiovascular SNS (pre-ejection period, blood pressure) and PNS (heart rate variability) activity were monitored continuously. Unstimulated saliva was collected repeatedly during and after each laboratory stressor, and sAA concentration (U/ml) and secretion (U/minute) determined. Both stressors increased anxiety. The MT caused an immediate and continued cardiac SNS activation, but sAA concentration increased at task cessation only (+54%); i.e., when there was SNS-PNS co-activation. During the MT sAA secretion even decreased (-35%) in conjunction with flow rate and vagal tone. The CPT robustly increased blood pressure but not sAA. In summary, sAA fluctuations did not parallel changes in cardiac SNS activity or anxiety. sAA responses seem contingent on sample timing and flow rate, likely involving both SNS and PNS influences. Verification using other stressors and contexts seems warranted.
['Nagy|Tamás|T|', 'van Lien|René|R|', 'Willemsen|Gonneke|G|', 'Proctor|Gordon|G|', 'Efting|Marieke|M|', 'Fülöp|Márta|M|', 'Bárdos|György|G|', 'Veerman|Enno C I|EC|', 'Bosch|Jos A|JA|']
D000328:Adult D001794:Blood Pressure D005260:Female D006339:Heart Rate D006801:Humans D008297:Male D010275:Parasympathetic Nervous System D012463:Saliva D055291:Salivary alpha-Amylases D013315:Stress, Psychological D013564:Sympathetic Nervous System D055815:Young Adult
Alpha-amylase Saliva Acute stress Parasympathetic nervous system Salivary flow rate Sympathetic nervous system