Effect of fatiguing exercise on longitudinal bone strain as related to stress fracture in humans
Effect of fatiguing exercise on longitudinal bone strain as related to stress fracture in humans
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DOI：
10.1114/1.103
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发表时间：
1998-07-01
影响因子：
3.8
通讯作者：
Burr, DB
中科院分区：
文献类型：
--
作者：
Fyhrie, DP;Milgrom, C;Burr, DB
在训练运动员或军事新兵的肌肉疲劳已被假设为导致增加的骨应变，可能有助于应力性骨折的发展。在正常情况下，肌肉通过收缩以减少皮质骨表面上的弯曲应变来发挥保护作用。狗的体内应变研究表明，剧烈运动后的肌肉疲劳会增加骨应变并改变应变分布。然而，类似的实验尚未在人类身上进行。这项工作的目的是在人类中测试这一假设，即剧烈的疲劳运动会导致骨应变升高。还假设这种升高在年轻人中比在老年人中更大，这是由于肌肉力量和耐力通常随着年龄的增长而下降。为了验证这些假设，在一段时间的疲劳运动之前和之后，测量了7名志愿者在步行过程中的胫骨应变。这两种假设都不成立。应变数据的事后分析表明，疲劳后应变率增加，与老年人相比，年轻人的增加幅度更大。虽然不是决定性的，这表明它是应变率，而不是应变量，这可能是应力断裂的原因。(C)1998年生物医学工程学会。
Muscular fatigue in the training athlete or military recruit has been hypothesized to cause increased bone strain that may contribute to the development of a stress fracture. Under normal circumstances, muscles exert a protective effect by contracting to reduce bending strains on cortical bone surfaces. In vivo strain studies in dogs show that muscle fatigue following strenuous exercise elevates bone strain and changes strain distribution. However, a similar experiment has yet to be performed in humans. The purpose of this work was to test the hypothesis in humans that strenuous fatiguing exercise causes an elevation in bone strain. It was also hypothesized that this elevation is greater in younger people than in older people due to the decline in muscle strength and endurance that normally occurs with age. To test these hypotheses, strain in the tibiae of seven human volunteers was measured during walking before and after a period of fatiguing exercise. Neither hypothesis was sustained. Post-hoc analysis of the strain data suggests that strain rate increases after fatigue with a greater increase in younger as opposed to older persons. Although not conclusive, this suggests that it is strain rate, rather than strain magnitude, that may be causal for stress fracture. (C) 1998 Biomedical Engineering Society.