Physical Therapy Korea (한국전문물리치료학회지)

Korean Research Society of Physical Therapy (한국전문물리치료학회)
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The Influence of the Pattern of Gripping the Ultrasound Head on the Activity of Upper Limb Muscles

초음파 도자를 쥐는 방법이 팔 근육의 근활성도에 미치는 영향

  • Choi, Seok-Ho (Dept. of Rehabilitation medicine, Wonju Severance Christian Hospital) ;
  • Yi, Chung-Hwi (Dept. of Physical Therapy, College of Health Science, Yonsei University, Dept. of Ergonomic Therapy, The Graduate School of Health Science, Yonsei University) ;
  • Jeon, Hye-Sun (Dept. of Physical Therapy, College of Health Science, Yonsei University, Dept. of Ergonomic Therapy, The Graduate School of Health Science, Yonsei University) ;
  • Lee, Jeong-Weon (Dept. of Occupational Therapy, Yeoju Institute of Technology)
  • 최석호 (원주 세브란스 기독병원 재활의학과) ;
  • 이충휘 (연세대학교 보건과학대학 물리치료학과, 보건환경대학원 인간공학치료학과) ;
  • 전혜선 (연세대학교 보건과학대학 물리치료학과, 보건환경대학원 인간공학치료학과) ;
  • 이정원 (여주대학교 작업치료과)
  • Received : 2013.03.06
  • Accepted : 2013.04.08
  • Published : 2013.05.21
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Abstract

This study examined differences in the activity of upper limb muscles according to how an ultrasound head is gripped. Twenty-two adult males were participated in the study. Each participant was asked to apply ultrasound treatment on to a lump of pork meat by two different ultrasound head grip patterns: spherical and cylindrical grips. Muscle activity was measured in the extensor carpi radialis longus (ECRL), flexor carpi ulnaris (FCU), and pronator teres (PT), triceps brachii (TB), middle deltoid (MD), and upper trapezius (UT) muscles. There were no significant differences in the EMG signals of any muscle according to the ultrasound head grip pattern (p>.05). There were significant differences in the EMG signal of each type of muscle (p<.05). The EMG signal of UT was the lowest and that of TB was lower than ECRL and FCU. There were interactions between ECRL and FCU, between ECRL and PT, between FCU and ECRL, and between FCU and MD. The EMG signal of ECRL using the cylindrical head was low and that of FCU with the cylindrical head was high, while the opposite was the case with the spherical head ($p_{adj}$ <.05/15). The results of this study indicate that the wrist muscles worked actively when the participants applied ultrasound therapy using both spherical and cylindrical heads. A spherical head might induce imbalanced muscle activity among the wrist muscles, leading to deviation of the wrist joint. Therefore, the cylindrical head is recommended for ultrasound therapy because it produced a constant, repeated force.

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References

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