Original Article

Low-cost 2ch EMG biofeedback device using a stereo microphone port

Yoshihiro Muraoka, PhD, Akiyo Ishio, PT, BS, Kotaro Takeda, PhD
Jpn J Compr Rehabil Sci 5: 1-6, 2014

Objectives: EMG-BF therapy in rehabilitation clinics requires the installation of an expensive electromyographic biofeedback (EMG-BF) device. However, many medical institutions find it difficult to purchase the device because of the high cost, and so the availability of EMG-BF therapy is limited. This study aimed to develop a low-cost and simply designed EMG-BF device using a stereo microphone port. The device can be easily fabricated even by people without knowledge and skills related to electronics.
Methods: The proposed device comprises an EMG amplifier, personal computer (PC) with a microphone port, electrodes, and their cables. The device is designed to be as simple as possible and with minimum components so that medical staff can obtain the required components and easily fabricate the device themselves.
Results: The amplifier consists of approximately 20 easily obtained components, and costs approximately 1,600 yen in total. This device can display the voluntary EMG of the extensor carpi radialis and flexor carpi ulnaris muscles in normal adults on a PC screen, enabling the amount of muscle contraction to be identified.
Conclusion: This device may help increase the use of EMG-BF therapy, and thus improve the quality of rehabilitation in clinics and homes.

Key words: EMG monitor, EMG biofeedback therapy, motor learning, neurorehabilitation

Contents (volume 5)