title: Inter-relation between autonomic and HPA axis activity in children and adolescents.
abstract: Stress research in youth typically considers either the autonomic nervous system or HPA axis. However, these systems are highly coordinated and physically interconnected. We examined whether the inter-relation between cardio-autonomic and HPA axis measures was better associated with perceived stress than their singular associations. Children and adolescents (N=201) collected saliva samples to measure cortisol (AUCAG, AUCI, maximum), wore an electrocardiogram monitor for 24h to derive heart rate variability (HRV; LF, HF, LF/HF ratio), and completed the Perceived Stress Scale. The interaction between sympathovagal modulation (LF, LF/HF ratio) and cortisol awakening response (AUCAG, AUCI, maximum) explained significantly greater variance in perceived stress than either stress system alone. Higher sympathovagal modulation combined with higher cortisol awakening response was associated with greater perceived stress. Findings suggest that the inter-relation between cardio-autonomic and HPA axis activity may advance our understanding of how stress impacts health.
authors.affiliation: Concordia University, Canada.
authors.forename: Sivan
authors.initials: S
authors.lastname: Rotenberg
authors.affiliation: Concordia University, Canada. Electronic address: jennifer.mcgrath@concordia.ca.
authors.forename: Jennifer J
authors.initials: JJ
authors.lastname: McGrath
mesh_terms: D000293:Adolescent; D001341:Autonomic Nervous System / Q000502:physiology*; D002648:Child; D005260:Female; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D006854:Hydrocortisone / Q000378:metabolism*; D007030:Hypothalamo-Hypophyseal System / Q000502:physiology*; D008297:Male; D010913:Pituitary-Adrenal System / Q000502:physiology*; D012463:Saliva; D013315:Stress, Psychological / Q000503:physiopathology*
chemical_list: D006854:Hydrocortisone
keywords: Adolescents; Autonomic nervous system; Children; Diurnal cortisol profile; Heart rate variability; Hypothalamic–pituitary–adrenal axis; Perceived stress
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