Journal of Korean Physical Therapy Science (대한물리치료과학회지)

Korean Physical Therapy Science (대한물리치료과학회)
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Difference of muscle activity and muscle contraction onset time of the trunk and lower extremity according to object weights and leg length discrepancy during lifting tasks

물건 들기 시 다리길이 차이 유무와 물건 무게에 따른 몸통과 다리의 근활성도와 근수축 개시시간 차이

  • Hyeon Nam Ryu (Dept. of Physical Therapy, Graduated school of Kyungsung University) ;
  • Sung Jun Han (Dept. of Physical Therapy, Graduated school of Kyungsung University) ;
  • Jin Tae Han (Dept. of Physical Therapy, and Institute for Rehabilitation Science, Kyungsung University)
  • 유현남 (경성대학교 대학원 물리치료학과) ;
  • 한성준 (경성대학교 대학원 물리치료학과) ;
  • 한진태 (경성대학교 물리치료학과 재활과학연구소)
  • Received : 2023.10.13
  • Accepted : 2023.12.01
  • Published : 2024.06.30
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Abstract

Background: The purpose of this study is to identify the difference in muscle activity and muscle contraction onset time according to a LLD and object weight When subjects performed a lifting task. Design: Repeated measure design Methods: 15 male adults participated in this study. When subjects performed a lifting task, we measured a difference of muscle activity and muscle contraction onset time in the rectus abdominis(RA), the erector spinae(ES), and the rectus femoris(RF) between both legs using the surface electromyogram (Telemyo DTS, Noraxon Inc., USA). When subjects performed a lifting task, the weight of the object was set to 0% kg, 10% kg, and 20% kg of the subject's body weight, excluding the weight of the box. Results: The difference in muscle activity in the RA, the ES, and the RF between both legs when lifting an object was larger in LLD condition than in non-LLD condition(p<0.05). In all of muscles, the difference of contraction onset time was generally increased as the object's weight increased. Specially, the difference in muscle contraction onset time in the RA, the ES between both legs was larger in the LLD condition than in the non-LLD condition(p<0.05). Conclusion: This study suggests that LLD affects the muscle activity and muscle contraction onset time during lifting objects. It can be used as data to prevent joint damage and muscle due to the LLD during work and movements of daily living.

Keywords

References

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