A training effect of controlling a pathological tremor using a tremor frequency biofeedback system

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  • 振戦周波数バイオフィードバック訓練による病的振戦抑制効果

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Abstract

The pathological tremor like the essential tremor (ET) disease and the Parkinson's disease (PD) lowers the patient's quality of the life. We studied on using a biofeedback (BF) for one of the non- drug treatments in the restraint of the tremor. In the previous report [9], we found the peak frequency from 6 to 10Hz (6-10Hz frequency) indicates condition of patient with PD. And the 16 healthy students were trained to increase the peak frequency. It was found that subjects who were able to increase the 6-10Hz frequency tended to also be able to depress the power of the tremor. The purpose of this study is to evaluate the effect of the 6-10Hz frequency BF training on the pathological tremor in patients with PD and ET. We investigated the 26 patients including 12 patients with ET and 14 with PD. All patients were randomly divided into the BF group and the control group. We attached an accelerometer on their dominant hand. We measured tremor acceleration in the posture the subject was sitting on the chair. Tremor accelerations were measured to calculate the 6-10Hz frequency. In the BF group, patients received the 6-10Hz frequency by the color change of a color lamp each 2 seconds. But in the control group, the color lamp didn't change the color. Both groups were indicated the training goal of the frequency rise and trained 1 minute training three times. At the ET patients, the 6-10Hz frequency of the BF group had increased significantly compared with the control group and a training goal was achieved. Moreover, the ET patients had a tendency to decrease the tremor amplitude after the BF training. This result suggests that the ET patients can control their tremor using the tremor frequency BF system.

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