摘要
目的观察伞兵着陆于不同地面情况时足底动力学指标值的变化规律。方法利用德国Pedar-X足底压力检测系统检测20名现役八一跳伞大队的跳伞运动员，模拟伞兵从60cm高度跳台跳下分别着陆于硬质地面和软质地面，记录相应的足底最大应力、最大压力、最大压力时间积分值的动力学指标值。将左、右足底分为10区，观察足底在两种地面情况下各自的变化规律，比较两种地面情况下足底最大应力的差异。结果左、右足底最大应力值在硬质地面和软质地面情况下分布均为9—10区〉8区〉1～7区；两种地面情况下足底最大应力值比较，后足的应力值差异有统计学意义（P〈0．05）；左、右足底最大压力值的分布规律与最大应力值的分布规律一致，两种地面情况下足底最大压力值比较右后足的应力值差异有统计学意义（P〈0．05）；左足前足压力时间积分值在硬地与沙地上差异无统计学意义（P〉0．05），右足前足压力时间积分值在硬地与沙地上差异有统计学意义（P〈0．05）。结论半蹲式着陆于硬地的后足最大压力值、最大应力值明显高于前足，与着陆于软地时足底最大压力值、最大应力值比较有差异。半蹲式着陆于硬质地面时足跟部易于出现损伤。在半蹲式着陆于软地较着陆于硬地不容易受到损伤。
Objective To investigate the variation of plantar dynamics in paratroopers landing on different ground conditions. Methods German Pedar-X system was used to measure the dynamic indexes of 20 active-duty parachutists from ＂August 1st＂ Skydiving Team, who simulated the jump from 60 cm-high platform as the paratroopers, and landed on the hard and soft ground, respectively, and the maximum stress, maximum pressure, and maximum pressure- time integral were recorded. The left and right plantar were divided into 10 regions. The variation of the plantar on the ground of two different conditions was determined. The differences of the plantar maximum stress of the two ground conditions were compared. Results The maximum stress distribution of left and right plantar on the hard and soft ground was ： regions 9-10〉 region 8〉 regions 1-7, respectively. Compared with the maximum hind-plantar stress, there were statistically significant differences between the maximum plantar stresses of the two ground conditions （P〈0.05）. The distribution of the maximum pressure and maximum stress of the left and right plantar was consistent. Compared with the maximum right hind-plantar stress, there were statistically significant differences between the maximum plantar stresses of the two ground conditions （P〈0.05）. There was a statistically significant difference between the time integral of left and right fore-plantar on hard and sandy ground, respectively （P〈0.05）. Conclusion The maximum pressure and maximum stress of hind-plantar of half squat-style landing on hard ground were significantly higher than those of fore-plantar of half squat-style landing on soft ground. There are differences in the maximum pressure and maximum stress between half squat-style landing on hard and soft ground. Compared with hard ground, landing with half squat-style on soft ground is not easy to injure heels.
出处
《中华生物医学工程杂志》
CAS
2015年第5期422-427,共6页
Chinese Journal of Biomedical Engineering
基金
国家自然基金（81071516）
