대한인간공학회지 (Journal of the Ergonomics Society of Korea)

  • 제29권3호
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  • Pages.279-286
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  • 2010
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  • 1229-1684(pISSN)
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  • 2093-8462(eISSN)
대한인간공학회 (Ergonomics Society of Korea)
권호 표지
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비대칭적 입식자세에서 상지 조립 작업 시 체간 및 둔부 근육의 좌우 근활성도 비교

Comparison Between Right and Left Muscle Activities of Hip and Trunk During Manual Task in Asymmetric Weight-Bearing Posture

  • 정지윤 (자생한방병원 척추건강센터) ;
  • 전혜선 (연세대학교 보건환경대학원 인간공학치료학과) ;
  • 이충휘 (연세대학교 보건환경대학원 인간공학치료학과) ;
  • 이정원 (여주대학 작업치료과)
  • Choung, Ji-Yun (Department of Physical Therapy, Jaseng Hospital of Oriental Medicine) ;
  • Jeon, Hye-Seon (Department of Ergonomic Therapy The Graduate School of Health and Environment, Yonsei University) ;
  • Lee, Chung-Hwi (Department of Ergonomic Therapy The Graduate School of Health and Environment, Yonsei University) ;
  • Lee, Jeon-Won (Department of Occupational Therapy Yeojoo Institute of Technology)
  • 투고 : 2007.12.14
  • 심사 : 2010.01.21
  • 발행 : 2010.06.30
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초록

The purpose of this study was to compare the electromyographic(EMG) activities of trunk and hip muscles between right and left sides while subjects performed prolonged manual task in asymmetric and symmetric weight-bearing posture. Fifteen healthy male college students were recruited for this study. The subjects were asked to perform bimanual upper extremity task for 6 minutes in two different standing postures. In the symmetric weight-bearing posture, the subjects were standing with evenly distributed body weights to both legs. In the asymmetric weight-bearing posture, the subjects distributed about 90% of their body weight onto their preferred(supporting) leg and 10% of their body weight onto the opposite leg while they were standing. EMG activities of the right and left internal oblique, erector spinae, gluteus maximus, and gluteus medius were measured and normalized as % MVIC. Then the EMG data were statistically analyzed using paired t-tests. The EMG activities of all measured muscles were not significantly different between the right and left side in the symmetrical weight-bearing posture(p>0.05). However, the EMG of the supporting side internal oblique was significantly lower than the opposite side(p<0.05), and the EMG of the erector spinae, gluteus maximus, and gluteus medius were significantly greater on the supporting side(p<0.05). The results of this study support that unbalanced use of right and left muscle possibly causes the changes in muscle length which results in asymmetry of trunk and hip muscles. Furthermore, the uneven weight support onto right and left legs will cause a distortion of viscoelastic ligaments around hip and sacroiliac joints in the long run. Further studies to determine the effect of various manual tasks on the trunk and hip muscles as well as the effect of asymmetrical weight-bearing standing posture on hip and back muscle fatigue may be required.

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