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Human sleep program publications March 3, 2023

Stress, hypothalamic pituitary adrenal axis activity and autonomic nervous system function in adolescents with insomnia

Dilara Yüksel, Orsolya Kiss, Fiona C Baker, Massimiliano de Zambotti

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Yuksel, Dilara, Orsolya Kiss, Devin Prouty, Nicole Arra, Laila Volpe, Fiona C. Baker, and Massimiliano de Zambotti. “Stress, hypothalamic pituitary adrenal axis activity and autonomic nervous system function in adolescents with insomnia.” International Journal of Psychophysiology 187 (2023): 43-53.

Abstract

Introduction

Abnormal stress responses have been linked to the etiology of insomnia. We investigated the relationship between insomnia, stress, hypothalamic-pituitary-adrenal (HPA) axis activity, and autonomic nervous system (ANS) function in adolescence.

Methods

Forty-seven post-pubertal adolescents (16–20 years old, 28 female) with (N = 16; insomnia group) and without (N = 31; control group) DSM-5 insomnia symptoms were assessed for stress levels and stress reactivity and underwent a standardized stress protocol (Trier Social Stress Test (TSST)), after an overnight laboratory stay. Cortisol was measured upon awakening and 30-minutes later to calculate the cortisol awakening response (CAR). During the TSST, perceived stress, salivary cortisol (HPA activity), heart rate (HR) and blood pressure (BP) measures were collected.

Results

Participants in the insomnia group reported more stress from school performance and work overload, with insomnia girls experiencing more stress from peer pressure and future uncertainty than control girls (p < 0.05). No group differences were detected in the CAR and pre-TSST stress levels. All participants showed significant increases in perceived stress (~19 %), HR (~33 %), systolic (~13 %), and diastolic (~15 %) BP in response to the TSST (p < 0.05). Overall HR stress response did not differ between groups, but was lower in boys with insomnia than in girls with insomnia (p < 0.05). Cortisol stress responses were inconclusive, possibly due to a masking effect of CAR, as the task was performed shortly after awakening and larger CARs were associated with blunted cortisol stress responses.

Discussion

Results mostly show no group difference in physiological stress responses, although some interaction effects suggest a potential sex by insomnia interaction. Larger samples are needed to understand the physiological disturbances of insomnia in adolescence.

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