Korean Journal of Applied Biomechanics (한국운동역학회지)

Korean Society of Applied Biomechanics (한국운동역학회)
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The Effect of Asymmetric Lower-Extremity Muscle Force of Elementary Students on Dynamic Balance during Walking

하지 근력의 좌우 비대칭성이 초등학생의 보행 동적안정성에 미치는 영향

  • Kim, Gun-Soo (Department of Physical Education, Graduate School of Education, Kyungpook National University) ;
  • Chae, Woen-Sik (Department of Physical Education, College of Education, Kyungpook National University) ;
  • Yoon, Chang-Jin (Department of Physical Education, College of Education, Kyungpook National University) ;
  • Lee, Haeng-Seob (Department of Physical Education, Graduate School of Kyungpook National University) ;
  • Kang, Nyeon-Ju (Department of Physical Education, College of Education, Kyungpook National University) ;
  • Kim, Dong-Soo (Department of Physical Education, Graduate School of Kyungpook National University)
  • 김건수 (경북대학교 교육대학원 체육교육과) ;
  • 채원식 (경북대학교 사범대학 체육교육과) ;
  • 윤창진 (경북대학교 사범대학 체육교육과) ;
  • 이행섭 (경북대학교 대학원 체육학과) ;
  • 강년주 (경북대학교 사범대학 체육교육과) ;
  • 김동수 (경북대학교 대학원 체육학과)
  • Received : 2011.07.30
  • Accepted : 2011.09.26
  • Published : 2011.09.30
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Abstract

The purpose of this study was to evaluate the effect of asymmetric muscle force in lower extremity on dynamic balance during walking. Sixteen elementary students(age: 12.3${\pm}$0.7 yrs, height: 149.4${\pm}$9.7 cm, weight 40.6${\pm}$7.8 kg) who have no musculoskeletal disorder were recruited as the subjects. Temporal parameters, M-L inclination angle of XCoM-CoP, M-L and A-P CoP, loading rate, and decay rate were determined for each trial. For each dependent variable, a independent-sample t-test was performed to test if significant difference existed between each conditions(p<.05). The displacement of antero-posterior COP during RTO-LHC1 in SG was siginificantly smaller than corresponding value in AG. In contrast, the displacement of medio-lateral COP during RTO-LHC1 in SG was greater than those of AG. It seems that imbalance of muscle force may result in increasing the medio-lateral stance in order to minimize the instability. We found that the asymmetric muscle force in the lower extremity may be a reason for the awkward control of impact force.

Keywords

References

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