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New Findings Reveal An Increase In Disorder Of Forearm Muscle Due To Fatigue

The findings suggest that an increase in entropy over time indicates an increase in the disorder of forearm muscle due to fatigue. In addition, bull's-eye electrodes provided an image of muscle activity at nine different points.

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Surface electromyography (sEMG) is a conventional technique for measuring muscle electrical activity during exercise. This strategy has been used for over 70 years and consists of two conventional procedures. The first uses a pair of electrodes (metals that transmit electricity through non-metals) to record from a specific muscle, whereas the second uses a grid of electrodes placed in a tiny rectangular pattern to assess the potential distribution of intra-muscular activity. However, these methods can only test a single muscle at a time. As a result, we have a limited comprehension of how our muscles cooperate when doing diverse physical tasks.

About the study 

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In a new study published in the Journal of Physiological Anthropology on 27 October 2023, Professor Yoshihiro Shimomura of the Design Research Institute, Chiba University, along with a team of researchers, demonstrated the use of bull’s-eye electrodes to evaluate the activity of multiple muscles at the same time and investigated its ability to assess fatigue and develop visuals of muscle coordination during a grasping task.

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His team included Ms. Megumi Shimura and Mr. Akihiko Mizumoto from the Graduate School of Science and Engineering, and Dr. Yali Xia from Design Research Institute, Chiba University.
“Ours is the first study to provide images of muscle coordination in the human body and to revolutionize the existing methodology of electromyography,” explains Dr. Shimomura.

Experiment

The researchers enrolled nine adults without any injuries or health issues for this study. The participants were asked to perform a grasping task. In this task, a pulley system with a handle at one end and a weight at the other end was employed, and the participants were instructed to grasp the handle with the hand most frequently used without moving the forearm. During the task, the bull’s-eye electrode measured the activity of muscles. The performance of this system was assessed using root mean square and entropy–a measure of the disorder of a system.

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Findings of the study

The findings suggest that an increase in entropy over time indicates an increase in the disorder of forearm muscle due to fatigue. In addition, bull’s-eye electrodes provided an image of muscle activity at nine different points. Thus, the study forms a base for further development of a multichannel sEMG system to increase the scope of measuring muscle activity. “Although our bull’s-eye electrode system has some limitations such as electric gain, it is a robust system that illustrates the muscle activity due to fatigue,” elaborates Dr. Shimomura

Dr. Shimomura concludes, “Having access to an electromyogram can aid in the treatment of muscle disorders of people working in urban lifestyles and improve the health of elderly people. It can also successfully transform the use of one’s body to improve the health and quality of life. Going forward, being able to better understand our electromyogram is likely to change the way we use our bodies and enhance our well-being.”

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Source: ANI

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