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A Wireless 2-Channel Layered EMG/NIRS Sensor System for Local Muscular Activity Evaluation.

Akira Kimoto¹, Yuya Oishi¹, Masanao Machida¹

¹Faculty of Science and Engineering, Saga University, Saga 840-8502, Japan.

Sensors (Basel, Switzerland)

|October 28, 2023

Summary

A new wireless sensor system combines electromyography (EMG) and near-infrared spectroscopy (NIRS) for simultaneous muscle activity analysis. This technology enables detailed local muscle function assessment at specific body positions.

Keywords:

electromyography layered sensor local muscular activity near-infrared spectroscopy

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Area of Science:

Biomedical Engineering
Neuroscience
Sports Science

Background:

Accurate muscle activity monitoring is crucial for understanding biomechanics and neurological conditions.
Existing methods for measuring muscle activity, such as electromyography (EMG) and near-infrared spectroscopy (NIRS), often require separate devices.
Simultaneous measurement of both electrical and hemodynamic muscle responses can provide a more comprehensive analysis.

Purpose of the Study:

To develop and validate a novel wireless 2-channel layered sensor system capable of simultaneously acquiring electromyography (EMG) and near-infrared spectroscopy (NIRS) data.
To assess the feasibility of using this integrated sensor system for analyzing local muscle activity at two distinct positions.
To demonstrate the system's utility in characterizing muscle responses during different types of contractions.

Main Methods:

A layered sensor system was designed, integrating thin silver electrodes for EMG and photosensors (LED/photodiode) for NIRS.
The system enabled simultaneous measurement of EMG and NIRS signals through paired electrodes and photosensors.
Experiments involved measuring EMG and NIRS signals during isometric constant and ramp forearm muscle contractions.

Main Results:

The developed layered sensor system successfully acquired simultaneous EMG and NIRS signals.
Simultaneous data acquisition allowed for detailed analysis of local muscle activity.
The system demonstrated its capability to differentiate muscle responses during various contraction types.

Conclusions:

A wireless, integrated EMG and NIRS layered sensor system has been successfully developed.
This system facilitates simultaneous measurement of muscle electrical activity and blood oxygenation.
The technology enables effective local muscle activity analysis, offering a comprehensive approach to understanding muscle function.