Spectral analysis of heart rate variability during trigger point acupuncture

Area of Science:

• Integrative and Complementary Medicine
• Autonomic Nervous System Physiology
• Acupuncture Research

Background:

• Cardiovascular autonomic nervous system (CANS) function is crucial for maintaining homeostasis.
• Acupuncture is a widely used complementary therapy, but its effects on CANS require further elucidation.
• Trigger point acupuncture, specifically targeting tender points associated with referred pain, may elicit distinct physiological responses.

Purpose of the Study:

• To investigate the impact of trigger point acupuncture on CANS function.
• To compare the CANS response to acupuncture at trigger points versus non-trigger points.
• To utilize spectral analysis of heart rate variability (HRV) for objective assessment.

Main Methods:

• 35 healthy male subjects were allocated to either a trigger point acupuncture group or a control group.
• Acupuncture needles were inserted into the tibialis anterior muscle for 10 minutes.
• Electrocardiography (ECG), blood pressure, and respiratory cycle were monitored; HRV spectral analysis (LF/HF ratio) was performed.

Main Results:

• The trigger point acupuncture group exhibited a transient decrease in heart rate and a significant increase in the high-frequency (HF) component of HRV.
• No significant changes in the low-frequency/high-frequency (LF/HF) ratio were observed in the trigger point group.
• The control group showed no significant alterations in heart rate, HF, or LF/HF components.

Conclusions:

• Acupuncture stimulation of trigger points in the tibialis anterior muscle transiently enhances parasympathetic nerve activity.
• These findings suggest a specific modulatory effect of trigger point acupuncture on autonomic function.
• Further research can explore the clinical implications of these autonomic changes in various conditions.