Biomechanical response to acupuncture needling in humans

Area of Science:

• Biomedical Engineering
• Acupuncture Research
• Biophysics

Background:

• The
• de qi
• sensation in acupuncture is crucial for therapeutic effects.
• This sensation involves a biomechanical component known as
• needle grasp.
• Quantifying needle grasp is essential for understanding acupuncture's mechanisms.

Purpose of the Study:

• To quantify the biomechanical phenomenon of needle grasp during acupuncture.
• To investigate the effect of needle rotation (unidirectional and bidirectional) on needle pullout force.
• To compare pullout forces at acupuncture points versus control points.

Main Methods:

• A computer-controlled acupuncture needling instrument was used to insert, manipulate, and extract acupuncture needles.
• Pullout force was measured in 60 human subjects at eight acupuncture points and eight control points.
• Needle manipulation involved no rotation (NO), unidirectional rotation (UNI), and bidirectional rotation (BI).

Main Results:

• Unidirectional rotation (UNI) increased mean pullout force by 167% compared to NO.
• Bidirectional rotation (BI) increased mean pullout force by 52% compared to NO.
• Pullout force was 18% greater at acupuncture points than at control points.

Conclusions:

• Needle grasp is a measurable biomechanical phenomenon directly influenced by acupuncture needle manipulation.
• Rotational techniques significantly enhance needle grasp, suggesting a quantifiable basis for the
• de qi
• sensation.
• Acupuncture points exhibit distinct biomechanical properties compared to control sites.