The Journal of Korean Physical Therapy

The Korean Society of Physical Therapy (대한물리치료학회)
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Comparison of Cortical Activation between Concentric and Eccentric Exercise: A Pilot fMRI Study

기능적 자기공명영상을 이용한 구심성 및 원심성 근 수축에 따른 뇌 활성도 분석

  • Kim, Chung-Sun (Department of Physical Therapy, College of Rehabilitation Science, Daegu University) ;
  • Kim, Joong-Hwi (Department of Physical Therapy, Kang Hospital) ;
  • Park, Min-Kyu (School of Mechanical and Automotive engineering Technology, Yeungnam College of Science and Technology) ;
  • Park, Ji-Won (Department of Physical Therapy, College of Health Science, Catholic University at Daegu)
  • 김중선 (대구대학교 재활과학대학 물리치료학과) ;
  • 김중휘 (강병원 물리치료실) ;
  • 박민규 (영남이공대학 기계.자동차학부) ;
  • 박지원 (대구가톨릭대학교 보건과학대학 물리치료학과)
  • Received : 2010.02.08
  • Accepted : 2010.03.21
  • Published : 2010.04.25
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Abstract

Purpose: Behavior and movement are accomplished by voluntary contractions of skeletal muscles. There are three types of muscle contractions: concentric, isometric and eccentric. The aim of our study was to determine whether there is a difference in the cortical activation pattern between concentric contraction and eccentric contraction of the wrist extensor muscle. Methods: Four healthy right-handed volunteers without any previous history of physical or neurological illness were recruited. fMRI scanning was done during 4 repeated blocks of concentric and eccentric exercise of the wrist joint. Subjects exercised for 12 seconds and then rested for 12 seconds before beginning the second set of exercises. To determine the excitability of cortical neurons during exercise, voxel count and intensity index were analyzed. Results: For right hand movements, when concentric contractions of the right wrist were done, only the left primary motor area was activated. In contrast, during eccentric contraction, both the primary motor area and secondary motor area were activated. For left hand movements, both concentric and eccentric contractions induced only the supplementary motor cortex and the contralateral primary motor cortex. Conclusion: During eccentric contractions, both the primary motor area and secondary motor area are activated in ipsilateral and contralateral brain areas. Thus, eccentric contractions require more complex and difficult movements than concentric contractions do.

Keywords

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