Journal of the Korean Society of Physical Medicine (대한물리의학회지)

The Korean Society of Physical Medicine (대한물리의학회)
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The Differences of Shoulder Muscle Activity Onset Time according to Body Tilting Angle in Push-up Exercise

Push-up 동작 시 신체기울기에 따른 견관절 주변근의 수축 개시시간 변화

  • Cho, Yong-Ho (Department of Physical Therapy, Daegu Haany University) ;
  • Kim, Sung-Ok (Department of Naturopathic Medicine, Dongbang Culture Graduate University) ;
  • Choi, Jin-Ho (Department of Physical Therapy, Daegu Haany University)
  • 조용호 (대구한의대학교 물리치료학과) ;
  • 김승억 (동방문화대학원대학교 자연치유학과) ;
  • 최진호 (대구한의대학교 물리치료학과)
  • Received : 2015.03.23
  • Accepted : 2015.05.12
  • Published : 2015.05.31
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Abstract

PURPOSE: The purpose of this study was to investigate recruiting order and onset time around shoulder muscle during the push-up according to the body tilting angle. METHODS: Twenty healthy young adult subjects were recruited for this study. They had no neurological and musculoskeletal disease. We used the sEMG for recording onset time of shoulder muscles. Shoulder Muscles were anterior deltoid(AD), posterior deltoid(PD), pectoralis major(PM), upper trapezius(UT). Body tilting angle were measured at 0 degree, 30 degree and 60 degree by using tilting table. Muscles contraction onset time were set by the push-up performed 3 times respectively. Mean of 3 measurements were used. And initiate onset time was decided by the Mean ${\pm}2$ SD in the threshold, more than 25ms. RESULTS: There were significant difference at 0 degree, 30 degree and 60 degree(p<.05). Muscles onset time were same order at 0 degree, 30 degree. UT occurred first of all contraction at 0 degree and 30 degree. And then contracted AD, PD, PM. But, at 60 degree, AD was the first contraction, and PM, UT, PD. CONCLUSION: Muscle recruitment order and onset time according to the body tilting was shown the difference when you do push-up. Therefore, this result, shoulder muscle recruitment pattern of according to the body tilting is different and it has to make effective shoulder exercise program.

Keywords

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