Vagal Mediation of Low-Frequency Heart Rate Variability during Slow Yogic Breathing

Bryan W. Kromenacker, Anna A. Sanova, Frank I. Marcus, John JB Allen, Richard D Lane

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Objective Changes in heart rate variability (HRV) associated with breathing (respiratory sinus arrhythmia) are known to be parasympathetically (vagally) mediated when the breathing rate is within the typical frequency range (9-24 breaths per minute [bpm]; high-frequency HRV). Slow yogic breathing occurs at rates below this range and increases low-frequency HRV power, which may additionally reflect a significant sympathetic component. Yogic breathing techniques are hypothesized to confer health benefits by increasing cardiac vagal control, but increases in low-frequency HRV power cannot unambiguously distinguish sympathetic from parasympathetic contributions. The aim of this study was to investigate the autonomic origins of changes in low-frequency HRV power due to slow-paced breathing. Methods Six healthy young adults completed slow-paced breathing with a cadence derived from yogic breathing patterns. The paced breathing took place under conditions of sympathetic blockade, parasympathetic (vagal) blockade, and placebo. HRV spectral power was compared under 11 breathing rates during each session, in counterbalanced order with frequencies spanning the low-frequency range (4-9 bpm). Results HRV power across the low-frequency range (4-9 bpm) was nearly eliminated (p =.016) by parasympathetic blockade (mean (SD) spectral power at breathing frequency = 4.1 (2.1)) compared with placebo (69.5 (8.1)). In contrast, spectral power during sympathetic blockade 70.2 (9.1) and placebo (69.5 (8.1)) was statistically indistinguishable (p =.671). Conclusions These findings clarify the interpretation of changes in HRV that occur during slow-paced breathing by showing that changes in low-frequency power under these conditions are almost entirely vagally mediated. Slow-paced breathing is an effective tool for cardiac vagal activation.

Original languageEnglish (US)
Pages (from-to)581-587
Number of pages7
JournalPsychosomatic Medicine
Volume80
Issue number6
DOIs
Publication statusPublished - Jul 1 2018

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Keywords

  • autonomic blockade
  • Heart rate variability
  • paced breathing
  • sympathetic-parasympathetic balance
  • vagal tone
  • yoga

ASJC Scopus subject areas

  • Applied Psychology
  • Psychiatry and Mental health

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