The Journal of Korean Physical Therapy

  • 제36권3호
  • /
  • Pages.103-109
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  • 2024
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  • 1229-0475(pISSN)
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  • 2287-156X(eISSN)
대한물리치료학회 (The Korean Society of Physical Therapy)
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Torque, Work, Power, and Muscle Activity Analysis According to Self-Selected Slow, Moderate, and Fast Angular Velocity for Knee Extension

  • Jonggeun Woo (Department of Physical Therapy, College of Health Sciences, Sunmoon University) ;
  • Jiheon Hong (Department of Physical Therapy, College of Health Sciences, Sunmoon University) ;
  • Jeongwoo Jeon (Digital Healthcare Institute, College of Health Sciences, Sunmoon University)
  • 투고 : 2024.05.27
  • 심사 : 2024.06.26
  • 발행 : 2024.06.30
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초록

Purpose: The performance of a task is influenced by the perception of its demands and the development of a response according to the movement pattern. This study aims to compare the change in kinetic variables and quadriceps muscle activity according to demands on angular velocity. Methods: Thirty-eight participants performed knee extensions at self-selective angular velocities of slow, moderate, and fast. Angular velocity, kinetic variables, and muscle activity (vastus medialis, vastus lateralis, and rectus femoris) were measured using a dynamometer and surface electromyography. kinetic variables and muscle activity of the knee extensors at three self-selected angular velocities were compared and correlations between the variables were analyzed. Results: There were significant differences in muscle activity and kinetic variables among angular velocities (p<0.001). Self-selective angular velocity was positively correlated with muscle activities and kinetic variables (p<0.001). The power in fast was 40 times higher than that in slow velocity. Conclusion: The simultaneous increase in angular velocity and force output was based on increased effort. The highest power was indicated for the fastest movement. We discovered that muscle activity and torque increased at a similar rate for increasing demands on angular velocity. The individual's most appropriate pattern would have been applied at the movement of self-selective angular velocity, and fast movement is considered to have the highest efficiency.

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과제정보

본 연구는 한국연구재단 기초과학연구의 연구비 지원을 받았음.

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