Evaluation of EMG/MMG/NIRS Layered Sensor in Isometric Ramp Contraction of Forearm

Abstract

A new multilayered sensor that allows simultaneous measurement of electromyography (EMG), mechanomyography (MMG), and near-infrared spectroscopy (NIRS) signals is developed for a more detailed analysis of muscular activity. The proposed sensor is a layered structure of a thin film with an indium tin oxide (ITO) electrode, a polyvinylidene fluoride (PVDF) film with ITO electrodes, and optical sensors. EMG, MMG, and NIRS signals, which provide three types of information, are measured using the ITO electrodes, PVDF film, and optical sensors. The three types of data obtained enable muscular activity to be evaluated in more detail. In an experiment, a simultaneous measurement of EMG, MMG, and NIRS signals at the isometric ramp contraction of the forearm is demonstrated. The layered sensor demonstrates potential for a more detailed muscular analysis.