We investigated cardiac vagal and sympathetic activity in 13 young primary insomniacs (PI; 24.4±1.6years) and 14 good sleepers (GS; 23.3±2.5years) during nocturnal sleep. Pre-ejection period (PEP; inversely related to beta-adrenergic sympathetic activity), interval between consecutive R-waves (RR), and vagal-related indices of time- and frequency-domain heart rate variability were computed during pre-sleep wakefulness and undisturbed arousal-free sleep stages (N2, SWS, REM) as well as across the whole night irrespective of the presence of disruptive sleep events (e.g. sleep arousals/awakenings) and/or sleep stage transitions. Groups exhibited a similar vagal activity throughout each undisturbed sleep stage as well as considering the whole night, with a higher modulation during sleep compared to prior wakefulness. However, PEP was constantly shorter (higher sympathetic activity) during pre-sleep wakefulness and each sleep stage in PI compared to GS. Moreover, pre-sleep RR intervals were positively associated with sleep efficiency and negatively associated with wake after sleep onset in PI. Altogether our findings indicated a dysfunctional sympathetic activity but a normal parasympathetic modulation before and during sleep in young adults with insomnia.
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http://dx.doi.org/10.1016/j.ijpsycho.2014.06.014 | DOI Listing |
Discov Med
January 2025
Department of Pharmacology "Otto Orsingher", Institute of Experimental Pharmacology of Córdoba (IFEC-CONICET), Faculty of Chemical Sciences, National University of Córdoba, X5000 Córdoba, Argentina.
Background: Angiotensin II, is critical in regulating the sympathetic and neuroendocrine systems through angiotensin II type 1 receptors (AT-R). Angiotensin II intracerebral administration increases water and sodium intake, as well as renal sodium excretion. Previously, our group has shown that AT-R is involved in behavioral and neurochemical sensitization induced by amphetamine.
View Article and Find Full Text PDFCureus
December 2024
Neurosurgery, Fluminense Federal University, Niterói, BRA.
Complex regional pain syndrome (CRPS) is a chronic pain condition characterized by significant sensory, motor, and autonomic dysfunction, often following trauma or nerve injury. Historically known as causalgia and reflex sympathetic dystrophy, CRPS manifests as severe, disproportionate pain, often accompanied by hyperalgesia, allodynia, trophic changes, and motor impairments. Classified into type I (without nerve injury) and type II (associated with nerve damage), CRPS exhibits a complex pathophysiology involving peripheral and central sensitization, neurogenic inflammation, maladaptive brain plasticity, and potential autoimmune and psychological influences.
View Article and Find Full Text PDFCurr Probl Cardiol
January 2025
Faculty of Health Sciences, School of Medicine, Queen's University, Kingston, Ontario, Canada; Division of Cardiology, Queen's University, Kingston, Ontario, Canada. Electronic address:
Negative emotions can have a significant impact on individuals, which then influences their cardiovascular system. However, the underlying pathophysiological mechanisms and clinical implications of this association remain inadequately defined. A narrative review of pertinent literature was conducted to examine the pathophysiology, clinical manifestations, and treatment related to the interplay between emotions and conditions such as takotsubo cardiomyopathy, atherosclerosis, acute plaque rupture, and cardiac arrhythmias.
View Article and Find Full Text PDFNeuroSci
January 2025
Department of Neurophysiology, Neuropsychology and Neuroinformatics, Medical University of Gdansk, 80-210 Gdansk, Poland.
This review emphasises the importance of the cardiovascular response to facial cooling (FC) and breath holding in both sexes. The trigemino-cardiac reflex, triggered by FC, reduces heart rate (HR) and constricts blood vessels. When combined with breath holding, this effect intensifies, enhancing the cardiodepressive impact.
View Article and Find Full Text PDFFunction (Oxf)
January 2025
Institute for Integrative Physiology, Department of Medicine, Pritzker School of Medicine, University of Chicago, Chicago, IL. 60637, USA.
Patients with obstructive sleep apnea (OSA) experience chronic intermittent hypoxia (CIH). OSA patients and CIH-treated rodents exhibit overactive sympathetic nervous system and hypertension, mediated through hyperactive carotid body (CB) chemoreflex. Activation of olfactory receptor 78 (Olfr78) by hydrogen sulfide (H2S) is implicated in CB activation and sympathetic nerve responses to CIH, but the downstream signaling pathways remain unknown.
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