Effects of aging on the plantar soft tissue properties under the metatarsal heads at different impact velocities
Effects of aging on the plantar soft tissue properties under the metatarsal heads at different impact velocities
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DOI：
10.1016/j.ultrasmedbio.2005.05.009
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发表时间：
2005-10-01
影响因子：
2.9
通讯作者：
Chang, KJ
中科院分区：
文献类型：
--
作者：
Hsu, CC;Tsai, WC;Chang, KJ
测量不同年龄组不同冲击速度下跖骨头下的足底软组织特性。使用自制的加载-卸载装置在低、中、高冲击状态下对健康年轻人（n = 9、19至35岁）和健康老年人（n = 10、42至72岁）左脚的每个跖骨进行体内检查；该装置的冲击速度分别约为2.5、5和10厘米/秒。该设备由 5 至 12 MHz 线性阵列超声换能器、微型称重传感器和固定框架组成。从低冲击状态到高冲击状态，青壮年的弹性模量（E）从约300 kPa显着增加至约500 kPa。然而，老年组中的E并没有表现出这种趋势。从低冲击状态到高冲击状态，跖骨的能量耗散比(EDR)在年轻组中从约30%显着增加至约60%，在老年组中从约40%显着增加至约70%。老年受试者的大多数跖骨的 E 和 EDR 明显高于年轻人。
The plantar soft tissue properties under the metatarsal heads at different impact velocities in different age groups were measured. Each metatarsus of the left foot in healthy young adults (n = 9, 19 to 35 years old) and in healthy older persons (n = 10, 42 to 72 years old) was examined in vivo using a self-constructed loading-unloading device at low, medium and high impact status; the impact velocities of the device were about 2.5, 5 and 10 cm/s, respectively. The device comprised a 5- to 12-MHz linear-array ultrasound transducer, a miniature load cell and a fixation frame. From low to high impact status, the elastic modulus (E) in young adults significantly increased from about 300 kPa to about 500 kPa. However, the E in the older group did not show this trend. From low to high impact status, the energy dissipation ratio (EDR) of the metatarsus significantly increased from about 30% to about 60% in the young group and significantly increased from about 40% to about 70% in the older group. Most of the metatarsus in the older subjects had significantly greater E and EDR than those in the younger persons.