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首页> 外文期刊>Aerospace medicine and human performance. >Protective Knee Braces and the Biomechanics of the Half-Squat Parachute Landing
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Protective Knee Braces and the Biomechanics of the Half-Squat Parachute Landing

机译：保护膝盖括号的生物力学Half-Squat降落伞着陆

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INTRODUCTION: Knee injuries are common among paratroopers and skydivers during landing maneuvers. The aim of this study was to investigate the effects of dropping height and the use of protective knee braces on parachute landing biomechanics.METHODS: The study cohort consisted of 30 male elite paratroopers with formal parachute landing training and more than 2 yr of parachute jumping experience. Each participant was instructed to jump off a platform at two different heights (40 and 80 cm, respectively) and land on force plates in a half-squat posture. All participants tested three different knee brace conditions (no-brace, elastic brace, and semi-rigid brace) at each height.RESULTS: With an increase in dropping height, peak vertical ground reaction forces (GRF), peak flexion angle, peak flexion angular displacement, peak abduction angle, peak abduction angular displacement, peak extorsion angle, and peak extorsion angular displacement of the knee joint all increased. As compared without the use of a brace, use of an elastic or semi-rigid knee brace significantly reduced peak flexion angle, peak flexion angular displacement, peak abduction angular displacement, and peak extorsion angle, while there were no significant differences in peak vertical GRF or peak extorsion angular displacement. The semi-rigid brace provided the greatest restriction against peak abduction angle (3-6°).DISCUSSION: The elastic and semi-rigid knee braces both effectively restricted motion stability of the knee joint in the sagittal andcoronal planes. The semi-rigid brace had a more marked effect, although the comfort of this device should be improved.
机译：作品简介:膝盖受伤是常见的伞兵和跳伞降落动作。调查高度和下降的影响保护膝盖括号的使用降落伞生物力学。由30个男性精英伞兵正式的培训和超过2降落伞着陆年的跳伞经验。参与者被指示跳下来一个平台在两个不同高度(40 - 80厘米,分别)和土地在力板上half-squat姿势。不同的膝盖支撑条件(no-brace弹性支撑,并在每个半刚性括号)高度。高度,峰垂直地面反应部队(平),峰值弯曲角,弯曲角峰值位移,绑架角峰值,峰值绑架角位移,峰值外旋角度,峰值外旋的角位移膝关节都增加了。使用括号,使用一个弹性或半刚性角撑显著降低峰值弯曲角,弯曲角峰值位移,绑架角位移峰值和峰值外旋角,而没有明显峰垂直平或峰的差异外旋角位移。支撑提供了最大的限制峰绑架角(3 - 6°)。弹性和半刚性膝盖括号有效地限制运动的稳定性膝关节的矢状andcoronal飞机。半刚性支架有一个更为显著的效果,尽管这个设备应该是舒适的改善。

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