Comparison of the mechanical properties of the heel pad between young and elderly adults
Comparison of the mechanical properties of the heel pad between young and elderly adults
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DOI：
10.1016/s0003-9993(98)90178-2
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发表时间：
1998-09-01
影响因子：
4.3
通讯作者：
Tang, FT
中科院分区：
文献类型：
--
作者：
Hsu, TC;Wang, CL;Tang, FT
目的：为了比较青年和老年人之间的人类脚跟垫的机械性能。设计：一个7.5 MHz的线性阵列超声换能器被纳入一个专门设计的设备，以测量不同负载下的脚跟垫的厚度。脚跟垫以0.5kg的连续增量压缩至最大3kg，然后依次放松。研究对象：随机选取33名无足跟问题的志愿者，年龄18~78岁，分为青年组、青年（40岁以下）和老年人主要结果测量：根据荷载-位移曲线计算了无荷载时的足跟垫厚度、压缩指数、刚度和耗能比。结果：青年组和老年组的平均无负荷足跟垫厚度分别为1.76 ± 0.20cm和2.01 ± 0.24cm（p <0.001）。年轻组的平均压缩性指数为53.3%+/-7.7%，老年组为61.3%+/-5.5%（p <0.001）。代表脚跟垫减震能力的能量耗散率，年轻组为23.7%+/-6.9%，老年组为35.3%+/-10%（p <.001）。结论：老年组脚跟垫的无载厚度、压缩指数和能量耗散率显着增加，表明脚跟垫的弹性丧失。弹性的丧失可能是老年人足跟损伤发生率较高的原因。(C)1998年由美国康复医学大会和美国物理医学和康复学会。
Objective: To compare the mechanical properties of the human heel pad between young and aged adults.Design: A 7.5-MHz linear-array ultrasound transducer was incorporated into a specially designed device to measure the thickness of the heel pad under different loads. The heel pad was compressed with serial increments of 0.5kg to a maximum of 3kg and then relaxed sequentially. Then the load-displacement curve of the heel pad during a loading-unloading cycle was plotted.Participants: Convenience sample of 33 volunteers without heel problems, aged 18 to 78 years, were divided into young (less than 40 years) and elderly (older than 60 years) groups.Main Outcome Measures: Unloaded heel-pad thickness, compressibility index, stiffness, and energy dissipation ratio were calculated from the load-displacement curves. Student's t-test was used to compare the mechanical properties of the heel between these two groups.Results: The average unloaded heel-pad thickness was 1.76 +/- .20cm in the young group and 2.01 +/- .24cm in the elderly group (p < .001). The average compressibility index was 53.3% +/- 7.7% in the young group and 61.3% +/- 5.5% in the elderly group (p < .001). Energy dissipation ratio representing shock absorbency of the heel pad, was 23.7% +/- 6.9% in the young group and 35.3% +/- 10% in the elderly group (p < .001).Conclusion: Unloaded heel-pad thickness, compressibility index, and energy dissipation ratio of the heel pad were significantly increased in the elderly group, indicating loss of the elasticity of the heel pad. The loss of elasticity may be responsible for the higher incidence of heel injury in elderly individuals. (C) 1998 by the American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation.