Temporal analysis of the spontaneous baroreceptor reflex during mild emotional stress in the rat.

Stress : the International Journal on the Biology of Stress
Dragana BajićN Japundzić-Zigon

Abstract

The effect of emotional stress on the spontaneous baroreceptor reflex (sBRR) in freely moving rats was investigated. Six male Wistar rats equipped with an intra-arterial polyethylene catheter were exposed to a 2-min air-jet stress. For time course analysis of the sBRR response to stress, the records of systolic blood pressure (SBP) and pulse interval (PI) were divided into five regions: baseline (BASELINE), acute exposure to air-jet stress (STRESS), immediate recovery (IMMED. RECOVERY), remaining recovery (RECOVERY), and delayed response (DELAYED RESPONSE). In addition to sBRR sensitivity and effectiveness, we introduce the sequence coverage area and its median for evaluation of the sBRR operating range and set point. During exposure to STRESS and IMMED. RECOVERY, sBRR sensitivity was preserved, its effectiveness was decreased, its operating range was enlarged, and the set point was shifted towards higher SBP and lower PI values. According to the joint symbolic dynamics analysis, the SBP and PI relationship became less predictable hence more prone to respond to stress. In RECOVERY the parameters regained baseline values and DELAYED RESPONSE occurred during which re-setting of sBRR was noted. It follows that emotional stress mod...Continue Reading

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Citations

Mar 23, 2011·Experimental Physiology·Olivera ŠarenacNina Japundžić-Žigon
Mar 16, 2013·British Journal of Pharmacology·Sanja Milutinović-SmiljanićNina Japundžić-Žigon
Mar 28, 2012·Journal of Neuroendocrinology·D MurphyN Japundzic-Zigon
Oct 7, 2010·IEEE Transactions on Bio-medical Engineering·Tatjana Loncar TurukaloNina Japundzic Zigon
Dec 31, 2014·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Mathias BaumertMuammar Kabir
Mar 2, 2019·Current Neuropharmacology·Naveen SharmaHyoung-Chun Kim
Jan 28, 2017·Computational and Mathematical Methods in Medicine·Tatjana TasicDragana Bajic
May 18, 2020·Hypertension Research : Official Journal of the Japanese Society of Hypertension·Bojana SavićNina Japundžić-Žigon
Jul 28, 2011·Stress : the International Journal on the Biology of Stress·Aurélia RevelClaude Julien
Oct 21, 2017·European Journal of Preventive Cardiology·Nina Japundžić-ŽigonDavid Murphy
Jan 29, 2019·Frontiers in Neuroscience·Tijana Bojić

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