Effect of time on biomechanics during exercise on the functional re-adaptive exercise device

ABSTRACT

Mechanistic studies of the Functional Re-adaptive Exercise Device (FRED) have shown it automatically recruits Lumbar Multifidus (LM) and Transversus Abdominis (TrA) – two deep-spinal muscles that are atrophied and show altered motor control in low back pain (LBP). No studies have investigated the time required to familiarise to FRED exercise, which is required to inform future FRED based clinical trial protocols. This study therefore determined the effect of time, during FRED exercise, on biomechanical outcome measures, to establish the familiarisation period, and assess for loss of technique throughout a ten minute trial. A cohort comparison study of 148 participants, 70 experiencing low back pain, had lumbopelvic kinematics, exercise frequency and movement variability measured during a 10 minute trial. Magnitude-based inference was used to assess for familiarisation, using plots of variation over time with familiarised reference ranges. The no pain group took 170 seconds, and the back pain group took 150 seconds, to familiarise. A familiarisation period of at least 170 seconds (2.8 minutes) is recommended. This justifies, and provides a familiarisation time for use of the FRED as a motor control intervention.     

特殊情形下线性模型异方差性的LM检验

考虑了特殊情形下具有异方差性的线性模型。首先导出了在模型中当异方差为线性函数时异方差检验的LM检验统计量及其性质,然后举例说明其有效性。     

简易扩音机电路的制作

根据平时带学生的实训项目制作,简要地介绍两款既容易实现又很实用的扩音机电路,该电路制作起来方便,使用起来简便.     

基于LM算法的机械臂轨迹规划研究

针对提高多关节机械臂轨迹规划精准率和效率的问题,利用Peter Corke开发的robotics-toolbox工具箱在MATLAB上进行机械臂的运动学建模,并设计了一种轨迹规划算法。该算法依托于LM算法,结合逆运动学获取关节角序列位置,在对应相关轨迹的同时,确保关节角速度和加速度曲线连续且光滑。研究结果表明,通过该算法不但可以得到相对稳定的运动曲线,其迭代速度相比传统的梯度下降法,在拟合离散点过程中具有更快的迭代速度。     

LM331及其应用

简要介绍了LM331及其V/F(F/V)基本转换电路的连接方法;并通过检测与转换中的三种应用实例来分析与说明LM331的应用价值。     

Social Media and Communications: Developing a Policy to Guide the Flow of Information

The use of social media is ubiquitous in the daily lives of nearly three quarters of the population in the United States. This article addresses the process and results of a policy development project for a National Network of Libraries of Medicine Regional Medical Library. Content, scheduling, editing, and author responsibilities are addressed for each of the chosen media outlets, as well as the preparation of prefatory material using an online social media policy development tool.     

对NN/LM 2001-2006年合同期项目的定量分析及启示

为深入了解NN/LM的项目资助情况,文章对NN/LM网站上获得的上一五年合同期详细的项目信息进行了深入的分析,得到项目数、各区域分布特点、基金投入的分布特点等,并对基金支持的多少以及一些特殊项目进行了详细的分析.从中得到值得我国建立医学图书馆资源共享网络借鉴的经验和启示.     

简易函数信号发生器的设计与实现

介绍以LM324运放芯片为核心,实现正弦波—方波—三角波输出的简易函数信号发生器的设计。该电路结构简单,信号的幅度、频率等参数可调,在仿真软件和实验室检测都有较好的性能输出,可替代实验室标准的函数信号发生器完成一般的实验要求,节省教学成本。     

基于STC89C52的模拟路灯控制系统设计

以STC89C52单片机为核心,采用光暗传感器检测环境变化,通过红外感应模块将物体运动的信号以高低电平的形式输入单片机,并通过三红外线输入的情况判断物体运行方向,进而控制LED灯的开关。