HPA Axis
Details
HPA Axis
Overview
The hypothalamic-pituitary-adrenal (HPA) axis is the body's central stress response system, regulating cortisol release and physiological responses to stress.
Components
- Hypothalamus — Releases CRH (corticotropin-releasing hormone)
- Pituitary — Releases ACTH (adrenocorticotropic hormone)
- Adrenal Glands — Release cortisol and other stress hormones
Function
- Acute stress response: Rapid cortisol mobilization
- Circadian regulation: Cortisol peaks in morning, lowest at night
- Metabolic regulation: Glucose metabolism, immune modulation
- Sleep-wake influence: Elevated cortisol disrupts sleep
HPA Axis and Sleep
- Normal pattern: Cortisol decreases at bedtime, increases before waking
- Sleep disruption: Elevated evening cortisol delays sleep onset
- Chronic activation: Contributes to insomnia and poor sleep quality
- Magnesium interaction: Proposed modulation but limited direct evidence
HPA Axis and Anxiety
- Hyperactive HPA axis associated with anxiety disorders
- Chronic stress dysregulates HPA feedback loops
- Magnesium deficiency may impair stress recovery
Interaction with Magnesium
Proposed mechanisms: - Magnesium modulates NMDA receptors involved in stress signaling - Chronic stress depletes magnesium stores - Magnesium supplementation may support HPA axis recovery
Related Entities
- cortisol-reduction — Outcome mechanism
- magnesium — Mineral proposed to modulate HPA axis
- circadian-rhythm — Related timing system
Entity page for HPA axis neuroendocrine system