In vivo measurement of human tibial strains during vigorous activity
In vivo measurement of human tibial strains during vigorous activity
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DOI：
10.1016/8756-3282(96)00028-2
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发表时间：
1996-05-01
期刊：
影响因子：
4.1
通讯作者：
Simkin, A
中科院分区：
文献类型：
--
作者：
Burr, DB;Milgrom, C;Simkin, A
我们对骨重塑机械控制的理解来自于对通过手术植入应变计的动物进行的研究，但仅在单个人身上进行过一次体内应变测量，该研究表明，步行和跑步期间人类胫骨的应变远低于骨折阈值，然而，尽管长时间的剧烈活动可能是应力性骨折发生的原因，但从未在人体内监测过剧烈活动期间的应变，我们假设人体上可能会产生>3000微应变的应变在剧烈活动期间，通过植入应变计对两名受试者的胫骨进行了测量，在与以色列步兵新兵经历的条件相似的条件下，主压缩和剪切应变在上坡和下坡锯齿形跑时最大，在某些情况下达到近2000微应变，大约比步行时记录的高出三倍，应变率在短跑和下坡跑时最高，达到0.050/秒，这些结果表明，应变是即使在剧烈活动的条件下，应变率仍保持在 2000 微应变以下，应变率高于先前在人类研究中记录的数据，但完全在跑步动物报告的范围内。
Our understanding of mechanical controls on bone remodeling comes from studies of animals with surgically implanted strain gages, but in vivo strain measurements have been made in a single human only once, That study showed that strains in the human tibia during walking and running are well below the fracture threshold, However, strains have never been monitored in vivo during vigorous activity in people, even though prolonged strenuous activity may be responsible for the occurrence of stress fractures, We hypothesized that strains >3000 microstrain could be produced on the human tibial midshaft during vigorous activity, Strains were measured on the tibiae of two subjects via implanted strain gauges under conditions similar to those experienced by Israeli infantry recruits, Principal compressive and shear strains were greatest for uphill and downhill zigzag running, reaching nearly 2000 microstrain in some cases, about three times higher than recorded during walking, Strain rates were highest during sprinting and downhill running,reaching 0.050/sec, These results show that strain is maintained below 2000 microstrain even under conditions of strenuous activity, Strain rates are higher than previously recorded in human studies, but well within the range reported for running animals.