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KMID : 1020120110090020001
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Journal of the Korean Academy of Clinical Electrophysiology
2011 Volume.9 No. 2 p.1 ~ p.6
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Changes in Electromyogram Signals from the Tibialis Anterior Muscle Resulting from Maximal Voluntary Contraction Exercise
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Song Su-Young
Hwang Ki-Kyeong
Kim Moon-Jeong
Lee Jeong-Woo
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Abstract
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Purpose : This study aims to examine changes in electromyogram (EMG) signals detected from the tibialis anterior muscle during repetitive contraction exercises in normal female adults.
Methods : The subjects of this study were 10 normal adult females without any musculoskeletal or nervous system disorders. A total of 30 contractions were made repetitively with maximal voluntary contraction exercise for six seconds and a resting time for three seconds. Changes in muscle contractions were measured using dynamometer and EMG signals such as root mean square (RMS), integrated EMG (IEMG), and median frequency (MDF).
Results : The result of measurement showed no significant differences in IEMG and RMS in accordance with the increase in the number of contractions. MVIC and MDF showed significant differences in accordance with the increase in the number of contractions (p<0.05).
Conclusion : This study demonstrated that repetitive tibialis anterior muscle contraction resulted in a significantly different MVIC and MDF but no significant differences in IEMG and RMS. Therefore, compared to other lower leg
muscles, the tibialis anterior muscle is a low-frequency muscle and therefore electrophysiological characteristics of the muscle should be considered in different exercise methods.
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KEYWORD
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Tibialis anterior, maximal voluntary contraction, root mean square, integrated EMG, median frequency
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