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首页> 外文期刊>Journal of Biomechanics >An induced acceleration index for examining joint couplings.
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An induced acceleration index for examining joint couplings.

机译：用于检查接头的感应加速度指数。

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摘要

A muscle produces moments at the joints it crosses, but these moments can also cause accelerations at joints not crossed by the muscle. This phenomenon, the acceleration of a joint caused by a muscle not crossing the joint, is referred to as induced acceleration. For a system of rigid bodies this study examines how system configuration, and segmental inertial properties dictate the potential of one joint to cause the acceleration of other joints in the system. From the equations of motion for a series of rigid bodies, an induced acceleration index (IAI) was developed. The IAI permits quantification of the relative potential of moments produced at joints in the kinematic chain to accelerate other joints in the kinematic chain. The IAI is a function of system orientation, segment lengths, and inertial properties. The IAI was used to examine the roles of the ankle and hip joints in quiet standing. The ankle joint had over 12 times the ability to accelerate the hip joint, than the hip had to accelerate the ankle joint. These results in part explain the relative merits of the two strategies predominantly used to maintain upright stance: the ankle and hip strategies. This index permits an understanding of how the induced accelerations are dependent on system configuration and inertial properties. The IAI is also useful in situations where the inertial properties of the system under investigation changes, for example due to the fitting of a new prostheses to a trans-tibial amputee.
机译：肌肉在其交叉的关节处产生力矩，但这些力矩也会在未与肌肉交叉的关节处引起加速度。这种现象是由于肌肉未穿过关节而引起的关节加速，被称为感应加速。对于一个刚体系统，本研究研究了系统配置和分段惯性特性如何决定一个关节潜在地导致系统中其他关节加速的可能性。根据一系列刚体的运动方程，开发了感应加速度指数（IAI）。 IAI可以量化运动链中关节产生的力矩的相对潜力，以加速运动链中其他关节的运动。 IAI是系统方向，线段长度和惯性属性的函数。 IAI用于检查踝关节和髋关节在安静站立时的作用。踝关节的加速髋关节能力是髋部加速踝关节的能力的12倍以上。这些结果部分解释了主要用于保持直立姿势的两种策略的相对优点：踝部和髋部策略。该指数允许理解感应加速度如何取决于系统配置和惯性特性。如果正在研究的系统的惯性特性发生变化（例如，由于将新的假体安装到跨胫骨截肢者），IAI也很有用。

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