Dynamic electromyographic response following acupuncture: possible influence on synergistic coordination

Area of Science:

• Biomedical Engineering
• Rehabilitation Medicine
• Neuromuscular Physiology

Background:

• Muscle activity asymmetry in the lumbar paraspinal (LP) muscles can lead to functional distortions.
• Electromyography (EMG) is a key tool for assessing neuromuscular function and identifying imbalances.

Purpose of the Study:

• To investigate the effect of acupuncture on lumbar paraspinal muscle activity asymmetry.
• To determine if acupuncture can improve synergistic muscle coordination during trunk movements.

Main Methods:

• Recorded left and right LP EMG activity during trunk flexion-return movements in 30 healthy subjects.
• Compared EMG amplitude between symmetrical (SS) and asymmetrical (AS) subjects.
• Administered acupuncture stimulation to LP muscles in AS subjects and analyzed changes in EMG asymmetry and absolute EMG values.

Main Results:

• A significant reduction in lumbar EMG asymmetry was observed after acupuncture stimulation (p=.049).
• No consistent pattern in absolute EMG values was noted on the stimulated side.
• On the non-stimulated side, EMG values significantly reduced when baseline was high (p=.037) and increased when baseline was low (p=.0185).

Conclusions:

• Acupuncture may be effective in reducing functional muscular distortion.
• Acupuncture shows potential for improving synergistic muscle coordination in cases of lumbar asymmetry.