The Korean Journal of Physical Education (한국체육학회지)

Korean Alliance for Health: Physical Education: Recreation:and Dance (한국체육학회)
권호 표지

The Effect of Blindfolded Eyes on Kinematics of Drop Landing

눈가림이 드롭랜딩의 착지동작에 미치는 영향

Jo, Sung-Cho
조성초

  • Published : 20040000
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Abstract

During a landing impact, the human body is exposed to large forces that create the potential for injury. The purpose of this study was to investigate the kinematical differences between blindfolded eye condition and open eye condition during drop landing. Sixteen junior high school boys executed drop jumps from height of 40cm. Each subject initiated the drop from the properly adjusted horizontal bar suspended from the ceiling. Each subject performed two landing trials; one is blindfolded eye condition(BFC) and the other is open eye condition(OEC), and each trial was recorded with a video camera at a rate of 60 Hz. Five markers were placed on the right side of each subject in order to define the position of upper body, upper leg, lower leg, and foot, as well as the angles between these segments. Ariel Performance Analysis System was used for analysis of all the images taken. Paired t-test was used for this study, and all statistical tests were conducted at the .05 level of significance. The results were as follows. 1) In initial touchdown, knee angle for BFC was greater than that for OEC by 7.5°(p<.001), but there were no significant differences between conditions for hip and ankle. 2) In minimum joint angle, hip value for BFC was greater than that for OEC by 22.6°( p<.05). 3) In range of joint motion, knee value for BFC was greater than that for OFC by 4.6°(p< .05) while hip for BFC was smaller than that for OFC by 11.5°(p< .05), but there was no significant difference between conditions for ankle. 4) In maximum angular velocity of joint, knee and ankle values for BFC were greater than those for OEC by 192.9°/ sec(p< .01) and 133.1°/ sec(p< .05) respectively, but there was no significant difference between conditions for hip. 5) In average angular velocity through range of joint motion, knee value for BFC was greater than that for OEC by 61.2°/ sec(p<.01), but there were no significant differences between conditions for hip and ankle.

Keywords

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