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Brief bedside PPG-HRV, particularly HF-related indices such as lnHF and HFnorm, provides auxiliary physiological information related to pain, sleep disturbance, and depressive symptoms in hospitalized adults with chronic pain.

In a cross-sectional study of 172 inpatients with chronic pain, lnHF was significantly associated with pain, sleep disturbance, and depression. Random-forest models showed the strongest predictive performance for sleep disturbance (R²_CV = 0.844), followed by depression (R²_CV = 0.696) and pain-related burden (R²_CV = 0.506).

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. From Subjective to Objective: The Bedside Value of HRV in AssessingChronic Pain Complicated by Emotionaland Sleep Issues.

observational

Hu J, Xiao Y, Ma G, Yao B, Li J, An H, Wang G, Chen Y · Applied psychophysiology and biofeedback (2026)

Participants: N/A
Duration: cross-sectional (single time point at admission)
Intervention: Brief bedside photoplethysmography-derived heart-rate variability (PPG-HRV) measurement, specifically HF-related indices (lnHF, HFnorm)
Outcome: Pain (BPI-SF), sleep disturbance (composite z-score of HAMD insomnia items and BPI-SF sleep-interference item), depression (HAMD-24), anxiety (HAMA-14)
Effect Size: N/A (no standardized effect size reported; moderation analysis β=0.159 for anxiety, β=0.252 for depression)
Population: Hospitalized adults (≥18 years, right-handed) with chronic pain (duration ≥3 months) admitted to an orthopedics/traumatology service

Result:

PubMed: 42429913DOI: 10.1007/s10484-026-09797-3

Mechanism Graph

PPG-HRV is recorded under standardized bedside conditions
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HF-related indices (lnHF, HFnorm) are extracted from 5-min recordings
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These indices correlate with pain, sleep disturbance, and depressive symptoms
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Sleep disturbance amplifies the association between pain and emotional symptoms

Limitations

  • ⚠Cross-sectional design precludes causal inference
  • ⚠HRV is not suitable for diagnosis or stand-alone decision-making

Frequently Asked Questions

What is PPG-HRV?▼

PPG-HRV stands for photoplethysmography-derived heart-rate variability, a non-invasive method to measure beat-to-beat changes in heart rate using a fingertip sensor.

How well does HRV predict sleep disturbance in chronic pain patients?▼

The random-forest model showed strong predictive performance for sleep disturbance with a cross-validated R² of 0.844.

Does sleep affect the relationship between pain and emotions?▼

Yes, sleep disturbance significantly moderated the pain-emotion pathway, amplifying the association between pain and both anxiety and depression.

Can HRV be used to diagnose chronic pain?▼

No, HRV is not suitable for diagnosis or stand-alone decision-making but may serve as a practical adjunctive marker for risk stratification and symptom monitoring.

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References

  1. 1.Hu J, Xiao Y, Ma G, Yao B, Li J, An H, Wang G, Chen Y. "From Subjective to Objective: The Bedside Value of HRV in AssessingChronic Pain Complicated by Emotionaland Sleep Issues.." Applied psychophysiology and biofeedback, 2026. PMID: 42429913 DOI: 10.1007/s10484-026-09797-3
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.