The Journal of Korean Physical Therapy

The Korean Society of Physical Therapy (대한물리치료학회)
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Comparative Study on Muscle Activity and Torque Value of Quadriceps of Healthy Adults

  • Kim, Min-Kyu (Department of Physical Therapy, General Graduate School, Catholic University of Daegu) ;
  • Ji, Hong-Ju (Department of Physical Therapy, College of Medical Science, Catholic University of Daegu) ;
  • Kong, Yong-Soo (Department of Physical Therapy, Gangneung Yeongdong College) ;
  • Hwang, Yoon-Tae (Department of Physical Therapy, Gangneung Yeongdong College) ;
  • Park, Ji-Won (Department of Physical Therapy, College of Medical Science, Catholic University of Daegu)
  • Received : 2016.06.02
  • Accepted : 2016.06.22
  • Published : 2016.06.30
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Abstract

Purpose: The current study seeks to identify the relationship between torque values of the quadriceps and muscle activity during isometric and isokinetic exercises. Methods: The subjects of the study included 29 healthy individuals 17 men and 12 women) who took part in isometric and isokinetic exercises that utilized the quadriceps. The isometric exercises were performed three times each at 4 different angles (0, 30, 60, and 90 degrees). For the isokinetic exercises, concentric contraction and eccentric contraction were undertaken three times each at two angular velocities (30 and 60 degrees). Results: The muscle activity of the quadriceps during the isometric exercises showed significant differences at the 30, 60, and 90 degree angles. During the concentric contractions and eccentric contractions, muscle activity at the peak torque of the quadriceps indicated significant differences in vastus medialis, vastus lateralis, and rectus femoris at angular velocities of 30 and 60 degrees. Conclusion: When applied clinically based on the biomechanical analysis of the current study, it is possible to anticipate and selectively strengthen muscles with isometric and isokinetic exercises for not only healthy adults and professional athletes, but also for those who experience limited knee movement for long periods following knee surgeries.

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