Breathing at a rate of 5.5breaths per minute with equal inhalation-to-exhalation ratio increases heart rate variability

I. M. Lin, L. Y. Tai, Sheng-Yu Fan

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

Objectives: Prior studies have found that a breathing pattern of 6 or 5.5. breaths per minute (bpm) was associated with greater heart rate variability (HRV) than that of spontaneous breathing rate. However, the effects of combining the breathing rate with the inhalation-to-exhalation ratio (I:E ratio) on HRV indices are inconsistent. This study aimed to examine the differences in HRV indices and subjective feelings of anxiety and relaxation among four different breathing patterns. Methods: Forty-seven healthy college students were recruited for the study, and a Latin square experimental design with a counterbalance in random sequences was applied. Participants were instructed to breathe at two different breathing rates (6 and 5.5 breaths) and two different I:E ratios (5:5 and 4:6). The HRV indices as well as anxiety and relaxation levels were measured at baseline (spontaneous breathing) and for the four different breathing patterns. Results: The results revealed that a pattern of 5.5. bpm with an I:E ratio of 5:5 produced a higher NN interval standard deviation and higher low frequency power than the other breathing patterns. Moreover, the four different breathing patterns were associated with significantly increased feeling of relaxation compared with baseline. Conclusion: The study confirmed that a breathing pattern of 5.5. bpm with an I:E ratio of 5:5 achieved greater HRV than the other breathing patterns. This finding can be applied to HRV biofeedback or breathing training in the future.

Original languageEnglish
Pages (from-to)206-211
Number of pages6
JournalInternational Journal of Psychophysiology
Volume91
Issue number3
DOIs
Publication statusPublished - 2014 Mar 1

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)
  • Neuropsychology and Physiological Psychology
  • Physiology (medical)

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