Korean Journal of Applied Biomechanics (한국운동역학회지)

Korean Society of Applied Biomechanics (한국운동역학회)
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The Influence of Angle Change of the Forefoot's Adhesive Outsole Designs on the Electromyographic Activity of the Erector Spinae and Selected Lower Limb Muscles during Downhill Walking

내리막 보행시 발 전족부 부착형 아웃솔의 각도 변화가 척추기립근과 하지근의 근활성도에 미치는 영향

  • Lee, Haeng-Seob (Department of Physical Education, Graduate School of Kyungpook National University) ;
  • Chae, Woen-Sik (Department of Physical Education, College of Education, Kyungpook National University) ;
  • Jung, Jea-Hu (Department of Physical Education, Graduate School of Kyungpook National University) ;
  • Kim, Dong-Soo (Department of Physical Education, Graduate School of Kyungpook National University) ;
  • Lim, Young-Tae (Division of Sports Science, College of Science & Technology, Konkuk University) ;
  • Jang, Jea-Ik (Department of Practical Physical Education, Keimyung College University)
  • 이행섭 (경북대학교 대학원 체육학과) ;
  • 채원식 (경북대학교 사범대학 체육교육과) ;
  • 정재후 (경북대학교 대학원 체육학과) ;
  • 김동수 (경북대학교 대학원 체육학과) ;
  • 임영태 (건국대학교 과학기술대학 스포츠과학부) ;
  • 장재익 (계명문화대학교 생활체육학부)
  • Received : 2013.11.02
  • Accepted : 2014.05.28
  • Published : 2014.06.30
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Abstract

The purpose of this study was to evaluate the effect of angle change of forefoot's adhesive outsole on the electromyographic activity (EMG) of the erector spinae and selected lower limbs muscle during downhill walking over $-20^{\circ}$ ramp. Thirteen male university students (age: $25.4{\pm}3.9$ yrs, height: $176.2{\pm}5.1$ cm, weight: $717.4{\pm}105.0$ N) who have no musculoskeletal disorder were recruited as the subjects. To assess the myoelectric activities of selected muscles, six of surface EMG electrodes with on-site pre-amplification circuitry were attached to erector spinae (ES), rectus femoris (RF), biceps femoris (BF), tibialis anterior (TA), lateral gastrocnemius (LG), and medial gastrocnemius (MG). To obtain maximum EMG levels of the selected muscles for normalization, five maximum effort isometric contraction were performed before the experimental trials. Each subject walked over $0^{\circ}$ and $20^{\circ}$ ramp with three different forefeet's EVA outsole (0, 10, $20^{\circ}$) in random order at a speed of $1.2{\pm}0.1$ m/s. For each trial being analyzed, five critical instants and four phases were identified from the recording. The results of this study showed that the average muscle activities of MG and LG decreased in $20^{\circ}$ shoes compared to $0^{\circ}$ and $10^{\circ}$ ones in the initial double limb stance (IDLS). In initial single limb stance (ISLS) phase, the average muscle activities of ES increased with the angle of forefoot's adhesive outsole, indicating that the increment of shoes' angle induce upper body to flex anteriorly in order to maintain balance of trunk. In terminal double limb stance (TDLS) phase, average muscle activities of TA significantly increased in $20^{\circ}$ outsole compared to $0^{\circ}$ and $10^{\circ}$ ones. There was no external forces acting on the right foot other than the gravity during terminal single limb stance (TSLS) phase, all muscles maintained moderate levels of activity.

Keywords

References

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