Inhibition of Parkinsonian tremor with cutaneous afferent evoked by transcutaneous electrical nerve stimulation.

The study included only 8 people with Parkinson's disease, so it cannot show how most patients would respond. Participants had been asked to take their usual morning medication before testing, so the result is electrical stimulation added to medication, not a replacement for it. Testing was short and laboratory-based, with 5-second stimulation periods, and did not measure whether hand tremor improved in daily tasks such as eating, writing, or walking. Tremor often returned immediately after stimulation, and some muscle or joint movements increased during stimulation in some trials. Only a single tremor-affected arm was tested, so it does not show effects on the other arm, legs, head, or trunk. The paper does not describe randomisation or a sham control group. The paper reports no follow-up beyond the short trials.

The funding section names the National Natural Science Foundation of China and the Ministry of Science and Technology of China. The supplied text does not give an author conflict-of-interest statement.

Do not conclude that electrical stimulation on the hand is a proven treatment for Parkinsonian tremor. The study tested only 8 people in short laboratory trials, participants had been asked to take their usual medication, tremor returned after stimulation, and no daily activity outcomes were measured.