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Effect of Back Strap Length Differences on Upper Extremity Muscle Activity, Center of Pressure, and Weight Distribution

가방 끈 길이 차이가 상지 근활성도, 압력중심 및 체중분포에 미치는 영향

  • Lee, Hyun Ju (Department of Physical Therapy, Konyang University) ;
  • Kim, Min Su (Department of Physical Therapy, Konyang University) ;
  • Kim, Ah Yeon (Department of Physical Therapy, Central Hospital) ;
  • kang, Hyun Gu (Sanitation Team, Boryeong City Health Center) ;
  • Tae, Ki Sik (Department of Biomedical Engineering, Konyang University)
  • 이현주 (건양대학교 물리치료학과) ;
  • 김민수 (건양대학교 물리치료학과) ;
  • 김아연 (센트럴병원 물리치료실) ;
  • 강현구 (보령시보건소 위생팀) ;
  • 태기식 (건양대학교 의공학부)
  • Received : 2021.10.13
  • Accepted : 2021.10.27
  • Published : 2021.10.31

Abstract

The purpose of this study was to investigate the effect on the activity of the upper trapezius and erector spinae according to the length difference of the backpack using electromyogram (EMG). We also conducted a study comparing the center of pressure (COP) and weight distribution before and after using Wii® balance board. Thirty individuals were randomly assigned to the experimental group (n=14) wearing a backpack with a short right strap length and a control group (n=16) wearing a backpack with the same strap length. Data were collected by dividing into groups, carring a 15% weight backpack and walking for 20 minutes on a treadmill. As a result of analyzing the EMG data, there was no significant change in the upper extremity muscle activity of the control group, but it was significantly decreased in the right upper trapezius activity of the experimental group (p<0.05). In addition, there was a significant change of COP in the experimental group (p<0.05), but there was no significant difference of the weight distribution in both groups. Recognizing mechanical changes in the body that may occur due to the asymmetry of the strap length is thought to be helpful for systematic ergonomic intervention according to changes in the external environment in the future.

Keywords

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