International Journal of Internet, Broadcasting and Communication

The Institute of Internet, Broadcasting and Communication (한국인터넷방송통신학회)
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Comparison of Triceps Surae EMG in Plantar Flexion Test of MMT at Different Knee Angles

  • Lee, Han Ki (Department of Physical Therapy, Masan University) ;
  • Lee, Jun Cheol (Department of Physical Therapy, College of Information & Technology)
  • Received : 2018.01.15
  • Accepted : 2018.02.05
  • Published : 2018.02.28
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Abstract

This study was conducted to examine changes in the muscle activity of the triceps surae, specifically the gastrocnemius and the soleus, depending on the angle of the knee joint during the manual muscle test (MMT) of the plantar flexion of the ankle. The muscle activity of the medial and lateral heads of the gastrocnemius was statistically significantly reduced when the angle of the knee joint was $15^{\circ}$, $30^{\circ}$, and $45^{\circ}$ compared to when the angle was $0^{\circ}$. However, there was no statistically significant difference in muscle activity at the angles of $15^{\circ}$ and $30^{\circ}$ or $45^{\circ}$. There was no statistically significant difference in the muscle activity of the soleus depending on the angle of the knee joint. The ratio of the muscle activity of the soleus to that of the triceps surae showed a statistically significant increase when the angle was $15^{\circ}$, $30^{\circ}$ and $45^{\circ}$ compared to when the angle was $0^{\circ}$. However, there was no statistically significant difference in muscle activity at the angles of $15^{\circ}$ and $30^{\circ}$ or $45^{\circ}$. When the angle of the knee joint was $15^{\circ}$ or higher during the test of the isolated soleus, the muscle activity of the gastrocnemius was reduced. These results indicate that the angle is suitable for the test of the isolated soleus, but there was no statistically significant difference in the muscle activity of the gastrocnemius when the angle was higher than $15^{\circ}$. Therefore, it can be concluded that the most suitable angle of the knee joint for the isolated MMT test of the soleus is $15^{\circ}$.

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