Korean Journal of Applied Biomechanics (한국운동역학회지)

Korean Society of Applied Biomechanics (한국운동역학회)
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Effects of Visual Information Blockage on Landing Strategy during Drop Landing

시각 정보의 차단이 드롭랜딩 시 착지 전략에 미치는 영향

  • Koh, Young-Chul (Department of Physical Education, Graduate School of Yonsei University) ;
  • Cho, Joon-Haeng (Department of Physical Education, College of Sciences in Education, Yonsei University) ;
  • Moon, Gon-Sung (Department of Physical Therapy, College of Health Science, Hanseo University) ;
  • Lee, Hae-Dong (Department of Physical Education, College of Sciences in Education, Yonsei University) ;
  • Lee, Sung-Cheol (Department of Physical Education, College of Sciences in Education, Yonsei University)
  • 고영철 (연세대학교 대학원 체육학과) ;
  • 조준행 (연세대학교 교육과학대학 체육교육과) ;
  • 문곤성 (한서대학교 보건학부 물리치료학과) ;
  • 이해동 (연세대학교 교육과학대학 체육교육과) ;
  • 이성철 (연세대학교 교육과학대학 체육교육과)
  • Received : 2010.10.31
  • Accepted : 2010.12.30
  • Published : 2011.03.31
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Abstract

This study aimed to determine the effects of the blockage of visual feedback on joint dynamics of the lower extremity. Fifteen healthy male subjects(age: $24.1{\pm}2.3\;yr$, height: $178.7{\pm}5.2\;cm$, weight: $73.6{\pm}6.6\;kg$) participated in this study. Each subject performed single-legged landing from a 45 cm-platform with the eyes open or closed. During the landing performance, three-dimensional kinematics of the lower extremity and ground reaction force(GRF) were recorded using a 8 infrared camera motion analysis system (Vicon MX-F20, Oxford Metric Ltd, Oxford, UK) with a force platform(ORG-6, AMTI, Watertown, MA). The results showed that at 50 ms prior to foot contact and at the time of foot contact, ankle plantar-flexion angle was smaller(p<.05) but the knee joint valgus and the hip flexion angles were greater with the eyes closed as compared to with the eyes open(p<.05). An increase in anterior GRF was observed during single-legged landing with the eyes closed as compared to with the eyes open(p<.05). Time to peak GRF in the medial, vertical and posterior directions occurred significantly earlier when the eyes were closed as compared to when the eyes were open(p<.05). Landing with the eyes closed resulted in a higher peak vertical loading rate(p<.05). In addition, the shock-absorbing power decreased at the ankle joint(p<.05) but increased at the hip joints when landing with the eyes closed(p<.05). When the eyes were closed, landing could be characterized by a less plantarflexed ankle joint and more flexed hip joint, with a faster time to peak GRF. These results imply that subjects are able to adapt the control of landing to different feedback conditions. Therefore, we suggest that training programs be introduced to reduce these injury risk factors.

Keywords

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