Supplements

Greater variability of post-respiratory delta-band activity is associated with neurocognitive dysfunction in obstructive sleep apnea

In a secondary analysis of 1077 adults with OSA from the APPLES study, greater variability (instability) of post-respiratory delta-band EEG activity was independently associated with poorer global cognitive performance (β = -1.50, 95% CI -2.30 to -0.71; p = 0.001) and reduced objective wakefulness (β = -0.38, 95% CI -0.64 to -0.11; p = 0.005), after adjusting for AHI and other confounders. This suggests delta instability may be a marker of impaired cortical resilience to respiratory stress.

Last updated: Jul 14, 2026•0 RCTs•📖 Read as article →

Evidence Score

Evidence Score34/100
Human RCT☆☆☆☆☆
Meta-analysis☆☆☆☆☆
Mechanism★★★★★
Safety★★★★☆
Confidencelow

Study Evidence

Study 1. Instability of post-respiratory delta activity is associated with neurocognitive dysfunction in obstructive sleep apnea.

observational

Gao X, Shi Y, Ma ZA, Song Y, Liu J · Sleep medicine (2026)

Participants: N/A
Duration: Not specified (baseline data from APPLES)
Intervention: Not applicable (observational analysis of post-respiratory delta activity variability)
Outcome: Global cognitive performance (Wechsler Abbreviated Scale of Intelligence), objective wakefulness (Maintenance of Wakefulness Test mean sleep latency), psychomotor performance
Effect Size: β = -1.50 (global cognition), β = -0.38 (wakefulness)
Population: Adults with obstructive sleep apnea (n=1077) from the APPLES study

Result:

PubMed: 42419040DOI: 10.1016/j.sleep.2026.109104

Mechanism Graph

Respiratory events during sleep trigger neural responses in the EEG
↓
Greater variability in post-event delta activity reflects impaired cortical resilience
↓
This instability disrupts neural recovery and sleep continuity
↓
Result: Neurocognitive dysfunction and reduced wakefulness

Limitations

  • ⚠Secondary analysis of existing data, not a prospective trial
  • ⚠Associations for psychomotor performance did not survive false discovery rate correction
  • ⚠Causality cannot be established from observational design

Frequently Asked Questions

What is post-respiratory delta activity instability?▼

It refers to the variability in delta-band EEG power measured immediately after the termination of respiratory events (apneas/hypopneas) across multiple events during sleep.

Was this association independent of the apnea-hypopnea index (AHI)?▼

Yes, the analysis adjusted for AHI and other conventional sleep parameters, indicating delta instability provides additional predictive value beyond standard severity indices.

What cognitive domains were affected?▼

Global cognitive performance (measured by WASI) and objective wakefulness (MWT sleep latency) were significantly associated. Psychomotor performance showed a nominal association that did not survive correction for multiple comparisons.

Could this be used as a clinical marker?▼

The authors suggest it may represent an electrophysiological marker of impaired cortical resilience, but further validation in prospective studies is needed before clinical use.

Products

Affiliate links coming soon. We only recommend products that match the doses and forms used in the cited research.

References

  1. 1.Gao X, Shi Y, Ma ZA, Song Y, Liu J. "Instability of post-respiratory delta activity is associated with neurocognitive dysfunction in obstructive sleep apnea.." Sleep medicine, 2026. PMID: 42419040 DOI: 10.1016/j.sleep.2026.109104
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.