...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Biomechanics >Viscous elements have little impact on measured passive length-tension properties of human gastrocnemius muscle-tendon units in vivo.
【24h】

Viscous elements have little impact on measured passive length-tension properties of human gastrocnemius muscle-tendon units in vivo.

机译：粘性元素对体内人胃肠肌肉肌腱单元的测量被动长度张力性能影响不大。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Several studies have measured the elastic properties of a single human muscle-tendon unit in vivo. However the viscoelastic behavior of single human muscles has not been characterized. In this study, we adapted QLV theory to model the viscoelastic behavior of human gastrocnemius muscle-tendon units in vivo. We also determined the influence of viscoelasticity on passive length-tension properties of human gastrocnemius muscle-tendon units. Eight subjects participated in the experiment, which consisted of two parts. First, the stress relaxation response of human gastrocnemius muscle-tendon units was determined at a range of knee and ankle angles. Subsequently, passive ankle torque and ankle angle were collected during cyclic dorsiflexion and plantarflexion at a range of knee angles. Viscous parameters were determined by fitting the stress relaxation experiment data with a two-term exponential function, and elastic parameters were estimated by fitting the QLV model and viscous parameters to the cyclic experiment data. The model fitted the experimental data well at slow speeds (RMSE: 1.7 ± 0.5N) and at fast speeds (RMSE: 1.9 ± 0.2N). Muscle-tendon units demonstrated a large amount of stress relaxation. Nonetheless, viscoelastic passive length-tension curves estimated with the QLV model were similar to elastic passive length-tension curves obtained using a model that ignored viscosity. There was little difference in the elastic passive length-tension curves at different loading rates. We conclude that (a) the QLV model can be used to quantify viscoelastic behaviors of relaxed human gastrocnemius muscle-tendon units in vivo, and (b) over the range of velocities we examined, the velocity of loading has little effect on the passive length-tension properties of human gastrocnemius muscle-tendon units.
机译：几项研究已经测量了体内单个人肌肉肌腱单元的弹性性质。然而，单一人肌肉的粘弹性行为尚未表征。在这项研究中，我们适应了QLV理论来模拟体内人胃肠肌肉肌腱单元的粘弹性行为。我们还确定了粘弹性对人胃肠肌肉肌腱单元的被动长度张力性质的影响。八个受试者参加了实验，它由两部分组成。首先，在一系列膝盖和踝角处测定人胃肠肌肉肌腱单元的应力松弛响应。随后，在一系列膝关节内的循环背屈和跖屈期间收集被动脚踝扭矩和脚踝角。通过用双级指数函数拟合应力松弛实验数据来确定粘性参数，通过将QLV模型和粘性参数拟合到循环实验数据来估计弹性参数。该模型以慢速速度（RMSE：1.7±0.5N）和快速（RMSE：1.9±0.2N）拟合实验数据。肌腱单元展示了大量的应力松弛。尽管如此，用QLV模型估计的粘弹性被动长度曲线与使用忽略粘度的模型获得的弹性被动长度张力曲线类似。不同装载率的弹性被动长度张力曲线几乎没有差异。我们得出结论，（a）QLV模型可用于量化体内轻松的人胃肠肌肉肌腱单元的粘弹性行为，（B）在我们检查的速度范围内，载荷速度对被动长度几乎没有影响 - 人胃肠肌腱单位的胶质性质。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号