The concentric anular electrode in surface electromyography

Abstract The recording properties of three different electrode arrangements (unipolar, bipolar and concentric anular electrodes) were compared by recording simultaneously the myoelectric signal of the biceps muscle. The concentric anular arrangement showed the following effects on the EMG: a decrease in signal amplitude and signal reproducibility and an increase in signal frequency bandwidth and spatial selectivity. There was no difference in the capability of detecting EMG changes related to muscular fatigue. Because of its high spatial selectivity the concentric anular electrode is recommended for applications requiring high rejection of myoelectric cross-talk from adjacent muscles.