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Chronic sleep deprivation and circadian disruption flatten cortisol circadian patterns and alter ultradian glucocorticoid pulsatility

This narrative review synthesizes evidence that chronic exposure to sleep deprivation and circadian disruption alters HPA axis function, leading to flattened daily cortisol rhythms and disrupted ultradian glucocorticoid pulsatility. These changes are associated with allostatic load and psychological/metabolic maladaptation.

Last updated: Jul 21, 2026•0 RCTs•📖 Read as article →

Evidence Score

Evidence Score32/100
Human RCT☆☆☆☆☆
Meta-analysis☆☆☆☆☆
Mechanism★★★★★
Safety★★★★☆
Confidencelow

Study Evidence

Study 1. Adaptive changes in adrenal steroid metabolism under extreme physical and psychological stress: a narrative review.

observational

Borakowska D, Podgórski R, Łuszczki E · Frontiers in endocrinology (2026)

Participants: N/A
Duration: N/A
Intervention: Chronic sleep deprivation and circadian disruption (observational, no controlled intervention)
Outcome: Cortisol circadian pattern, ultradian glucocorticoid pulsatility, HPA axis function
Effect Size: N/A
Population: Humans exposed to extreme physical and psychological stress, including military personnel and clinical populations

Result:

PubMed: 42460312DOI: 10.3389/fendo.2026.1860059

Mechanism Graph

Chronic sleep deprivation and circadian disruption activate the HPA axis repeatedly
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Prolonged or repetitive activation leads to allostatic load
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This alters daily glucocorticoid exposure and flattens circadian cortisol patterns
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Result: Disrupted ultradian glucocorticoid pulsatility and suppression of downstream reproductive and metabolic axes

Limitations

  • ⚠Narrative review design, not a systematic review or meta-analysis
  • ⚠Evidence for direct nutrient-mediated prevention of HPA-axis maladaptation remains preliminary or indirect
  • ⚠Lack of standardized steroid sampling and sex-specific outcomes in reviewed studies

Frequently Asked Questions

Does sleep deprivation directly cause flattened cortisol rhythms?▼

The review indicates that chronic sleep deprivation and circadian disruption are associated with flattened cortisol circadian patterns, but causality is inferred from observational and military studies rather than controlled trials.

What is allostatic load in the context of HPA axis function?▼

Allostatic load refers to the cumulative physiological burden from repeated or chronic stress, leading to maladaptive changes such as flattened cortisol rhythms and altered glucocorticoid pulsatility.

Can nutritional interventions prevent HPA axis maladaptation?▼

The review states that evidence for direct nutrient-mediated prevention is preliminary or indirect; nutritional interventions should focus on correcting deficiencies and reducing stressor load rather than serving as hormonal therapy.

What populations were studied in this review?▼

The review prioritized recent human and military studies, including individuals exposed to extreme physical and psychological stress such as sleep deprivation, energy deficit, and prolonged military training.

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References

  1. 1.Borakowska D, Podgórski R, Łuszczki E. "Adaptive changes in adrenal steroid metabolism under extreme physical and psychological stress: a narrative review.." Frontiers in endocrinology, 2026. PMID: 42460312 DOI: 10.3389/fendo.2026.1860059
Disclaimer: This content is for educational purposes only and is not medical advice. Evidence scores reflect the quality and quantity of available research, not clinical recommendations. Always consult a healthcare professional before starting any supplement or intervention.