Neural Effects of Low-Frequency Acupoint Electrical Stimulation Therapy on Patients With Poststroke Motor Dysfunction: A Resting-State Functional Magnetic Resonance Imaging Study.

Researchers in China studied how electrical stimulation at acupuncture points affects brain function in stroke survivors with movement difficulties. The study included 28 stroke patients who had experienced damage to the right side of their brain, along with 20 healthy individuals for comparison. Using specialized brain imaging called functional MRI, scientists examined how different brain regions communicate with each other.

The treatment involved placing electrodes on specific acupuncture points on both the scalp and the affected arm and leg. Points included Shousanli, Waiguan, Neiguan, Zusanli, and others traditionally used for motor recovery. Different electrical frequencies were applied to different body areas: low-frequency (2 Hz) on the head, and higher frequencies on the limbs. Patients received 30-minute sessions once daily, six days per week, for three weeks.

Before treatment, stroke patients showed abnormal brain activity patterns compared to healthy individuals. Their sensorimotor networks—the brain regions controlling movement—showed decreased coordination, while areas like the cerebellum and structures near the hippocampus showed increased activity. After three weeks of electrical acupoint stimulation, patients demonstrated significant improvements. Brain scans revealed increased activity in the right sensorimotor network regions, suggesting the brain was reorganizing itself to recover function. These brain changes correlated with measurable improvements in motor function and daily living activities.

The findings suggest that the combination of traditional acupuncture point selection with modern electrical stimulation may help stroke survivors by promoting beneficial reorganization of brain networks involved in movement control. This lateralized functional remodeling—where the unaffected side of the brain compensates for damaged areas—appears to be a key mechanism for recovery. If you're considering acupuncture or electroacupuncture after stroke, consult with a licensed acupuncturist experienced in neurological rehabilitation and coordinate care with your medical team.

This case-control fMRI study (n=28 stroke patients, n=20 healthy controls) investigated neural mechanisms underlying low-frequency electroacupuncture for poststroke motor dysfunction. Patients with right basal ganglia infarcts received scalp electroacupuncture at motor areas (2 Hz, 100 μs, 1.5 mA) plus limb point pairs including LI10-SJ5, PC4-PC6, ST36-ST37, and BL55-BL57 at varying frequencies (35-50 Hz, 200-400 μs, 40 mA). Treatment consisted of 30-minute sessions, six times weekly for three weeks.

Regional homogeneity (ReHo) analysis revealed baseline abnormalities: decreased synchrony in sensorimotor network (SMN) regions and increased ReHo in bilateral parahippocampal gyrus, cerebellum, and cerebellar vermis (FDR-corrected, P<.05). Post-intervention, patients demonstrated increased ReHo in right SMN regions and decreased left cerebellar activity. Right precentral gyrus ReHo changes positively correlated with Fugl-Meyer Assessment improvements, while left cerebellar changes correlated with Modified Barthel Index gains.

Clinical significance: Lateralized SMN functional remodeling represents a potential therapeutic mechanism, supporting electroacupuncture protocols targeting ipsilesional motor network enhancement in stroke rehabilitation.