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Conformable Wearable Electrodes: From Fabrication to Electrophysiological Assessment

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DATSURYOKU Sensor-A Capacitive-Sensor-Based Belt for Predicting Muscle Tension: Preliminary Results.

Akihiko Murai^1,2, Shusuke Kanazawa¹, Ko Ayusawa¹

¹Human Augmentation Research Center, National Institute of Advanced Industrial Science and Technology, Chiba 277-0882, Japan.

Sensors (Basel, Switzerland)

|October 13, 2021

Summary

Routine muscle tension measurement is crucial for preventing sports injuries. A novel circumference sensor effectively detects muscle tension and relaxation, even when not visible in motion, aiding in preemptive injury prevention.

Keywords:

DATSURYOKU (muscle relaxation)capacitive sensor preemptive medicine wearable sensing

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Area of Science:

Biomechanics
Sports Medicine
Physiology

Background:

Excessive muscle tension from inactivity or daily strain increases joint stiffness, leading to poor athletic performance and injury.
Detecting muscle co-contraction, a key indicator of excessive tension, is challenging with conventional motion capture systems as it's masked by opposing muscle activity.
Routine muscle tension monitoring is vital for injury prevention and performance optimization in athletes.

Purpose of the Study:

To introduce and validate a novel method for measuring muscle tension, focusing on co-contraction and relaxation.
To assess the efficacy of the DATSURYOKU sensor in capturing physiological muscle changes.
To explore the potential of this sensor for routine muscle tension assessment and injury prevention.

Main Methods:

Utilized a DATSURYOKU sensor, which measures the circumference of the applied area, to assess muscle tension.
Focused on physiological muscle characteristics: increased cross-sectional area during activity and softening during relaxation.
Conducted experiments involving maximal voluntary co-contractions of thigh muscles and squats to validate the sensor's measurements.

Main Results:

Demonstrated a high interclass correlation between muscle activity and circumference measurements during maximal voluntary co-contractions and squats.
Confirmed the DATSURYOKU sensor's ability to detect passive muscle deformation not evident in standard motion analysis.
Showcased the sensor's capacity to measure both muscle tension and relaxation effectively.

Conclusions:

The DATSURYOKU sensor shows significant potential for the routine measurement of muscle tension and relaxation.
This technology can help mitigate the risk of injury and failure associated with excessive muscle tension.
Routine monitoring using this sensor can contribute to preemptive medicine by tracking daily physiological changes.