The mechanical properties of the heel pad in elderly adults
The mechanical properties of the heel pad in elderly adults
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DOI：
10.1007/bf00334416
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发表时间：
1996-06-01
期刊：
影响因子：
--
通讯作者：
Ogawa, T
中科院分区：
文献类型：
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作者：
Kinoshita, H;Francis, PR;Ogawa, T
在60 ~ 67岁（n = 10）和71 ~ 86岁（n = 10）两组活跃老年人中，研究了足跟垫的体内减震特性。为了进行比较，年龄在17至30岁之间的年轻人（n = 10）也进行了研究。采用由仪表轴（质量为5kg）、加速度计和位置检测传感器组成的自由落体冲击试验装置，获得足跟在冲击过程中的减速度和变形。数据来源于0.57 m的冲击速度。S(-1)（慢）和0.94 m。(1)(快)。评估了减速和变形的峰值，以及从撞击开始到这些峰值的时间，以及能量吸收。在较慢的冲击速度下，除了能量吸收外，所测参数没有发现年龄效应。在快速冲击速度下，老年人的峰值减速度高于年轻人，变形较小。老年人吸收的能量比年轻人少。结果表明，鞋垫的减震能力随着年龄的增长而下降。
The shock absorbing characteristics of the heel pad in vivo were examined in two groups of active elderly individuals whose ages ranged between 60 and 67 years (n = 10) and between 71 and 86 years (n = 10). For comparative purposes, young adults (n = 10) aged between 17 and 30 years were also examined. A free-fall impact testing device which consisted of an instrumented shaft (mass 5 kg), accelerometer and position detection transducer was used to obtain deceleration and deformation of the heel during impact. The data were obtained from impact velocities of 0.57 m . s(-1) (slow) and 0.94 m . s(-1) (fast). Peak values of the deceleration and deformation, as well as the time to these peaks from onset of impact, and energy absorption were evaluated. At the slow impact velocity, no age effect was found for the parameters examined except for the energy absorption. At the fast impact velocity, there was higher peak deceleration and smaller deformation for the elderly than for the younger adults. The energy absorbed was less for the elderly than for the younger adults. It was concluded that the capacity for shock absorbency of the heel pad declines with age.