Enhancing Vagal Tone, Modulating Heart Rate Variability with Auricular Acupressure at Point Zero: A Randomized...

Area of Science:

• Neuroscience
• Integrative and Complementary Medicine
• Cardiology

Background:

• The vagus nerve plays a crucial role in regulating autonomic nervous system balance.
• Point Zero, located in the auricular branch of the vagus nerve, is a potential target for neuromodulation.
• Heart rate variability (HRV) is a reliable indicator of vagal tone and autonomic function.

Purpose of the Study:

• To investigate the effects of auricular acupressure (AA) at Point Zero on vagal activity.
• To measure changes in heart rate variability (HRV) following AA intervention.
• To assess the immediate and short-term impact of AA on autonomic function.

Main Methods:

• A single-blinded randomized controlled trial was conducted with 114 healthy volunteers.
• Participants were assigned to either the AA group (n=57) or a sham-AA (SA) group (n=57).
• HRV parameters (HR, SDNN, RMSSD, LnLF, LnHF) and respiratory rate were monitored at multiple time points before, during, and after a 30-minute intervention involving 30-second acupoint stimulations.

Main Results:

• The AA group showed significant reductions in heart rate (HR) and increases in SDNN, RMSSD, and LnHF compared to baseline and the SA group.
• These HRV improvements were most pronounced during and immediately after acupoint stimulation (T3 and T5).
• No significant changes were observed in LnLF or respiratory rate, and HR returned to baseline levels by T6, while some HRV parameters showed sustained changes.

Conclusions:

• Auricular acupressure at Point Zero can rapidly enhance vagal activity, as evidenced by HRV modulation.
• The observed effects are prompt, particularly during direct acupoint stimulation, and show some sustained changes.
• Further research is warranted to explore the long-term efficacy and therapeutic potential of AA at Point Zero for various conditions.