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Six weeks of exercise training improves parasympathetic heart rate variability in obese adults, but the effect on sympathetic HRV differs by obstructive sleep apnea severity

In obese adults, a six-week supervised exercise program improved cardiorespiratory fitness and parasympathetic HRV (VLF%, HF%) across the sample. However, an interaction effect showed that SDNN increased in those with no/mild OSA but decreased in those with moderate/severe OSA, suggesting insufficient sympathetic improvement in the latter group.

Last updated: Jul 16, 2026โ€ข1 RCTsโ€ข๐Ÿ“– Read as article โ†’

Evidence Score

Evidence Score44/100
Human RCTโ˜…โ˜…โ˜†โ˜†โ˜†
Meta-analysisโ˜†โ˜†โ˜†โ˜†โ˜†
Mechanismโ˜…โ˜…โ˜…โ˜…โ˜…
Safetyโ˜…โ˜…โ˜…โ˜…โ˜†
Confidencelow

Study Evidence

Study 1. The Effects of a Six-week Exercise Program on Heart Rate Variability in Adults with and Without Obstructive Sleep Apnea.

observational

Dobrosielski DA, Ives SJ, Kubitz KA, Park H, Papandreou C, Patil S ยท Sleep and biological rhythms (2026)

Participants: N/A
Duration: 6 weeks
Intervention: Six-week supervised comprehensive exercise program (3 days/week)
Outcome: Heart rate variability parameters (VLF%, HF%, SDNN, RMSSD, LF/HF), cardiorespiratory fitness, body composition
Effect Size: ฮทpยฒ = 0.11 for VLF% and HF%; ฮทpยฒ = 0.12 for SDNN interaction
Population: Obese adults (BMI > 33 kg/mยฒ) with no/mild OSA (AHI < 15 events/h, n=27) or moderate/severe OSA (AHI > 15 events/h, n=29); mean age ~50 years

Result:

PubMed: 42453635DOI: 10.1007/s41105-026-00666-4

Mechanism Graph

Exercise training increases parasympathetic activity (HF%) and reduces sympathetic dominance (VLF%) across the sample
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In no/mild OSA, exercise enhances overall HRV (SDNN increase)
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In moderate/severe OSA, exercise fails to improve sympathetic HRV signal (SDNN decrease)
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Result: Parasympathetic improvement occurs regardless of OSA severity, but sympathetic HRV response is blunted in moderate/severe OSA

Limitations

  • โš Small sample size (n=56 total) limits generalizability
  • โš Short-term HRV measurement may not reflect long-term autonomic changes
  • โš No control group without exercise, so causal inference is limited

Frequently Asked Questions

Does exercise improve heart rate variability in people with obstructive sleep apnea?โ–ผ

Yes, but only for parasympathetic measures (HF%, VLF%) across the sample. For overall HRV (SDNN), improvement was seen only in those with no/mild OSA, while those with moderate/severe OSA showed a decrease.

What type of exercise program was used in this study?โ–ผ

A supervised comprehensive exercise program lasting six weeks, with sessions three days per week.

How was obstructive sleep apnea severity classified?โ–ผ

OSA severity was classified using overnight polysomnography: no/mild OSA as AHI < 15 events/hour, and moderate/severe OSA as AHI > 15 events/hour.

What are the key heart rate variability measures that changed?โ–ผ

Significant changes were observed in VLF% (p=0.015), HF% (p=0.016), and an interaction effect for SDNN (p=0.01).

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References

  1. 1.Dobrosielski DA, Ives SJ, Kubitz KA, Park H, Papandreou C, Patil S. "The Effects of a Six-week Exercise Program on Heart Rate Variability in Adults with and Without Obstructive Sleep Apnea.." Sleep and biological rhythms, 2026. PMID: 42453635 DOI: 10.1007/s41105-026-00666-4
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.