Physical Therapy Korea (한국전문물리치료학회지)

Korean Research Society of Physical Therapy (한국전문물리치료학회)
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Electromyographic Analysis of Wrist Flexors by the Shape of Ultrasound Head

초음파 도자의 모양에 따른 손목굽힘근의 근전도 분석

  • Kim, Won-Ho (Dept. of Physical Therapy, Ulsan College) ;
  • Kim, Jong-Man (Dept. of Physical Therapy, Division of Health, Seonam University) ;
  • Park, Hyung-Ki (Dept. of Occupational Therapy, Division of Health, Seonam University) ;
  • Park, Eun-Young (Dept. of Rehabilitation Welfare, Woosuk University)
  • 김원호 (울산과학대학 물리치료과) ;
  • 김종만 (서남대학교 물리치료학과) ;
  • 박형기 (서남대학교 작업치료학과) ;
  • 박은영 (우석대학교 재활복지학과)
  • Received : 2007.03.28
  • Accepted : 2007.06.25
  • Published : 2007.09.17
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Abstract

The purpose of this study was to investigate electromyographic activities of the flexor digitorum superficialis (FDS) and the flexor carpi ulnaris (FCU) by the shape of the ultrasound head. Twelve healthy subjects participated and performed ultrasound therapy with a round head and a long handled head during each 5-minute application. Electromyographic activities of the FDS and FCU were recorded by surface electrodes and normalized by maximal voluntary isometric contraction (MVIC) values. There was no difference in the muscular fatigue of FDS and FCU as determined by the shape of the ultrasound head (p>.05). Without the shape of head, the mean power frequency decreased with the time. There also was no difference in %MVIC of the FDS and FCU as determined by the shape of the ultrasound head (p>.05), but the force exerted exceeded 20%MVIC. There was however a significant difference in the amount of cumulative workload of the FDS and FCU as determined by the shape of ultrasound head (p<.05). The workload was however not affected by the shape of the ultrasound head. Constant static grasp of ultrasound transducer head during ultrasound therapy is considered a high risk factor of work-related musculoskeletal disease.

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