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Related Experiment Video

Updated: Jul 27, 2025

Functional Near Infrared Spectroscopy of the Sensory and Motor Brain Regions with Simultaneous Kinematic and EMG Monitoring During Motor Tasks

Functional Near Infrared Spectroscopy of the Sensory and Motor Brain Regions with Simultaneous Kinematic and EMG Monitoring During Motor Tasks

Published on: December 5, 2014

Relationship between EMG and fNIRS during Dynamic Movements.

Natalia Daniel¹, Kamil Sybilski², Wojciech Kaczmarek¹

¹Faculty of Mechatronics, Armament and Aviation, Institute of Rocket Technology and Mechatronics, Military University of Technology, 2 gen. S. Kaliskiego Street, 00-908 Warsaw, Poland.

Sensors (Basel, Switzerland)

|June 10, 2023

Summary

This study explored the link between surface electromyography (sEMG) and functional near-infrared spectroscopy (fNIRS) during exercise. Positive correlations were found, suggesting a mutual relationship between muscle activity and oxygenation signals during dynamic movements.

Keywords:

EMG correlation fNIRS oxygen consumption signal changes

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Area of Science:

Physiology
Biomedical Engineering
Sports Science

Background:

Surface electromyography (sEMG) and functional near-infrared spectroscopy (fNIRS) are advanced physiological measurement techniques.
The interrelationship between sEMG and fNIRS signals during dynamic movements is an ongoing area of research.

Purpose of the Study:

To determine the relationship between sEMG and fNIRS signals during dynamic movements.

Main Methods:

Two sports exercise protocols were used: the Astrand-Rhyming Step Test and the Astrand Treadmill Test.
Oxygen consumption and muscle activity were recorded from the gastrocnemius muscle of the left leg in five female participants.

Main Results:

Positive correlations (median Pearson: 0.343-0.788; median Spearman: 0.192-0.832) were observed between sEMG and fNIRS signals in all participants.
Higher correlations between sEMG and NIRS signals were found in participants with a more active lifestyle during the treadmill test.
The signal patterns suggest a mutual relationship during dynamic movements.

Conclusions:

The findings indicate a positive correlation between muscle activity and oxygenation signals during dynamic exercise.
Participant activity level may influence the correlation between sEMG and fNIRS signals.
Results should be interpreted with caution due to the small sample size.