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    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.