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Heart Rate Variability and Mood State Changes in Three Yoga Breathing Practices: A Randomized Crossover Trial
International Journal of Yoga Therapy
|January 24, 2026
Summary
Three yoga breathing techniques impact heart rate variability (HRV) differently. Bumblebee and bellows breathing increased vagally mediated HRV, while high-frequency breathing decreased it, affecting mood states positively.
Area of Science:
- Physiology
- Psychophysiology
- Yoga Studies
Background:
- Previous research indicates varied short-term effects of distinct yoga breathing practices on heart rate variability (HRV).
- A comprehensive assessment comparing multiple yoga breathing techniques against control conditions was lacking.
- Understanding the acute physiological and psychological impacts of specific pranayama techniques is crucial for therapeutic applications.
Purpose of the Study:
- To evaluate the acute effects of three distinct yoga breathing practices (bumblebee, bellows, high-frequency) on HRV, respiration, and mood states.
- To compare these effects against an interventional control (breath awareness) and a non-interventional control (quiet rest).
- To investigate the influence of yoga breathing on vagally mediated heart rate variability.
Main Methods:
- A randomized crossover design involving 42 yoga-experienced participants.
- Five intervention sessions were conducted on separate days: bumblebee, bellows, high-frequency yoga breathing, breath awareness, and quiet rest (15 minutes each).
- Measurements included heart rate variability (HRV), blood pressure, respiration (before, during, after), and mood state (before and after).
Main Results:
- Bumblebee yoga breathing (slow, deep, short inhalation) increased low-frequency power (LF) of HRV, associated with a mean breath rate of 4 breaths/min.
- Bellows yoga breathing (deep, longer inhalation) increased the root mean square of successive differences (RMSSD), indicating enhanced vagal activity.
- High-frequency yoga breathing (rapid, deep, longer inhalation) decreased RMSSD, suggesting reduced vagal modulation. Bumblebee and bellows breathing improved mood states, while breath awareness also positively impacted mood.
Conclusions:
- Bumblebee and bellows yoga breathing techniques appear to enhance vagally mediated heart rate variability (HRV) and positively influence mood.
- High-frequency yoga breathing may reduce vagally mediated HRV.
- Findings are limited to short-term effects in experienced yoga practitioners, warranting further research for broader generalizability.
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