The Journal of Korean Physical Therapy

The Korean Society of Physical Therapy (대한물리치료학회)
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Comparison of Isokinetic Parameters of Knee Extensors According to Age and Individualized Joint Angular Velocity in Women

  • Jeongwoo Jeon (Digital Healthcare Institute, Sunmoon University) ;
  • Jonggeun Woo (Department of Physical Therapy, College of Health Sciences, Sunmoon University) ;
  • Suji Lee (Department of Physical Therapy, College of Health Sciences, Sunmoon University) ;
  • Jiheon Hong (Digital Healthcare Institute, Sunmoon University)
  • Received : 2024.09.20
  • Accepted : 2024.10.21
  • Published : 2024.10.31
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Abstract

Purpose: This study examined the changes in the isokinetic variables of knee extensors according to age and individualized joint angular velocity during isokinetic contraction in women. Methods: Fourteen young and fifteen middle-aged and elderly women participated in this study. The knee extension maximum angular velocity for each participant was measured and considered 100% angular velocity. The peak torque (PT) and average power (AP) of the knee extensors were measured during isokinetic contractions at angular velocities of 10%, 40%, 70%, and 100% of the maximum velocity. The changes in PT and AP were compared according to age (young vs. middle-aged and elderly) and angular velocity (10%, 40%, 70%, and 100%). Results: PT and AP at all angular velocities were significantly higher in the young than in middle-aged and elderly women (p>0.05). PT showed a significant decreasing trend as the angular velocity increased. AP was significantly higher at a 40% and 70% angular velocity compared to other angular velocities in young women (p>0.05). In the middle-aged and elderly, AP at 10% angular velocity was significantly lower than at 40%, 70%, and 100% (p>0.05). Conclusion: This study showed that considering the individual's neuromuscular capacity during isokinetic contraction, the ability to generate power in the middle-aged and elderly is reduced significantly even when the angular velocity was set. Hence, improving muscle contraction ability at high angular velocities may be necessary to prevent and treat the muscle function decline caused by aging.

Keywords

Acknowledgement

본 연구는 한국연구재단 기초과학연구의 연구비 지원을 받았음(RS-2020R1C1C1012483).

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