Archives of Orthopedic and Sports Physical Therapy (정형스포츠물리치료학회지)

The Korean Society of Sports Physical Therapy (대한스포츠물리치료학회)
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Effects of Muscle Activity and Muscle Strength According to Verbal Command Volume in Isokinetic and Isometric Exercise of Quadriceps

넙다리네갈래근의 등속성 및 등척성 운동에서 구두명령 크기에 따른 근 활성도와 근력에 미치는 영향

  • Lee, Hyoungsoo (Dept. of Physical Therapy, Gwangju Health University) ;
  • Kim, Yoonhwan (Dept. of Physical Therapy, Gwangyang Health Sciences University)
  • 이형수 (광주보건대학교 물리치료과) ;
  • 김윤환 (광양보건대학교 물리치료과)
  • Received : 2018.11.07
  • Accepted : 2018.12.26
  • Published : 2018.12.31
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Abstract

Purpose: The purpose of this study was to investigate the effects of muscle activity and muscle strength according to verbal command volume during isokinetic and isometric quadricep exercises. Methods: To measure muscle activity and muscle strength, surface electrodes were attached to the participants, as they sat on a Biodex chair. The isometric exercise was performed three times, with maximum exercise at $30^{\circ}$ bending angle, based on a maximum extension state of the knee at $0^{\circ}$. The average holding time was unified to three seconds. In addition, the isokinetic exercise was performed three times, at $60^{\circ}/sec$. The verbal command ranged between 0∾60 dB and 0∾75 dB. Muscle activity was measured using surface electromyography (4D-MT, Relive, Gimhae, Korea). The Biodex System 4 was used to measure the isometric and isokinetic strength of the nodal line, and 4D-MT was used to measure muscle activity. Results: There were significant improvements in the maximal and relative muscle strengths, when the 0∾ 60 dB and 0∾75 dB verbal commands were applied with isokinetic extension/flexion (p<.05). The isokinetic exercise (0∾75 dB) group showed a significant difference in the vastus medialis oblique muscle activity change (p<.05), while the isometric exercise (0∾75 dB) group showed a significant difference in the rectus femoris muscle activity change (p<.05). Conclusions: Our results reveal that verbal commands effectively improve muscle activity and muscle strength during isokinetic and isometric quadricep exercises.

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