Journal of Biomedical Engineering Research (대한의용생체공학회:의공학회지)

The Korean Society of Medical and Biological Engineering (대한의용생체공학회)
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Alteration of the Static Posture of Spine under Different Types and Amounts of Loading

가방 하중의 크기와 방식에 따른 척추 정적 자세의 변화

  • Park, Yong-Hyun (Department of Mechanical Engineering, School of Engineering, Kyung Hee University) ;
  • Kim, Young-Kwan (Department of Mechanical Engineering, School of Engineering, Kyung Hee University) ;
  • Kim, Yoon-Hyuk (Department of Mechanical Engineering, School of Engineering, Kyung Hee University)
  • 박용현 (경희대학교 공과대학 기계공학과) ;
  • 김영관 (경희대학교 공과대학 기계공학과) ;
  • 김윤혁 (경희대학교 공과대학 기계공학과)
  • Received : 2011.02.24
  • Accepted : 2011.04.18
  • Published : 2011.09.30
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Abstract

The aim of this study was to investigate the alteration of lumbar spine and trunk postures on different load-carrying types and amounts under static loading. Two load-carrying types(unilateral carrying: UC vs. bilateral carrying: BC) and four different loads(0, 5, 10, and 15 kg) were randomly tested in this study. Carrying a heavy bag would affect human body posture, specifically lumbar spine curvature, which is considered as one of sources of back problems. Previous studies have not paid attention to the approach of the multisegment model of the lumbar spine and trunk. This study separated two compartments of trunk segment(the lumbar and thorax) in the analysis. The multisegment model of the lumbar spine in addition to Helen-Hayes marker set was used. Eight motion analysis cameras and a force plate were utilized. Ten male subjects(mean mass, $70.6{\pm}3.97$ kg; mean height, $178{\pm}4.18$ m) having no musculoskeletal disease participated in this study. We analyzed trunk angles in three anatomical planes and the spinal curvature in sagittal and frontal planes. Increased loading in both UC and BC significantly resulted in increases in trunk forward lean but only UC induced increases in trunk lateral lean. In addition, increased loading in BC produced flatten lumbar curvature in sagittal plane. As far as coupling motion, subjects tended to use axial rotation of the lumbar spine in transverse plane in response to increased UC loading. Finally, it is concluded that the increased static loading in UC rather than in BC tends to causes combined alterations of the spinal postures(sagittal and transverse planes together), which would be vulnerable to improper mechanical stresses on the spine.

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