VDT MOUSE DESIGN EFFECT ON CTD RISK AND USER SKILL

电子鼠标操作的生物力学要求可能是有风险的 前臂和腕部累积性创伤障碍(CTD)的因素和 可能会限制两者之间的技能获得和最终技能熟练程度 熟练的和新手鼠标使用者。没有商业化的鼠标 消除了所有这些限制，并研究了鼠标用户的熟练程度 没有充分评估技能获得，特别是在以下方面 肌肉骨骼系统。 本研究的目的是：1)评估生物力学效应。 在前臂和手腕上使用鼠标，2)设计一种替代鼠标 这降低了前臂和手腕(CTD)的风险，并确定了 生物力学效应的小鼠设计，以及3)确定的效果 鼠标设计对技能的获得和熟练程度。假设是 测试如下：1)使用标准鼠标将与 固定手腕伸展，固定手腕尺偏，使用手腕桡侧- 鼠标操作时尺骨偏斜，连续，次最大 前臂旋前肌和手腕的肌电活动 伸肌和尺骨偏斜肌；2)新的鼠标设计将减少这些 生物力学约束；3)鼠标新手将演示 如图所示，使用新鼠标设计提高技能获得率 随着时间的推移，在技能水平、速度、准确性和马达方面的改进 执行鼠标输入任务所使用的协调模式；以及4) 无论是熟练的鼠标用户还是新手鼠标用户都将展示更好的终极体验 使用新鼠标设计的技巧。 125名熟练和新手职业鼠标用户将 在七周内对图形鼠标目标任务进行了五次测试 使用标准鼠标和为该项目设计的新鼠标。3D 前臂和手腕的运动学和肌电将在以下三项上进行测量 来访。将使用双因素分层方差分析进行比较 跨用户技能类别和鼠标设计的终极鼠标技能。ANCOVA 将用于比较不同用户的鼠标技能改进率 技能类别和鼠标设计。学生的t检验将被用来比较 鼠标跨鼠标使用所需的固定姿势和运动范围 设计。运动学和肌电模式将用于比较 跨技能类别和鼠标设计的运动协调模式。 这项研究将记录职业人群中CTD风险因素的程度 鼠标用户。这将导致一种旨在降低这些风险的新鼠标。 它将探索鼠标使用的限制对 完成复杂的功能任务。它将调查 旨在平衡以下问题的人体工学解决方案的有效性 工人风险和熟练工人绩效的上限。是这样的 知识将促进计算机化办公室预防CTD和 增强对技能限制的理解 人机界面。

The biomechanical requirements for electronic mouse operation may be risk factors for cumulative trauma disorder (CTD) of the forearm and wrist and may limit skill acquisition and ultimate skill proficiency among both highly skilled and novice mouse users. No commercially available mouse eliminates all of these constraints, and studies of mouse user proficiency have not adequately assessed skill acquisition, especially with respect to the musculoskeletal system. The objectives of this study are; 1) to evaluate the biomechanical effects of mouse use on the forearm and wrist, 2) to design an alternative mouse that reduces the risk of forearm and wrist (CTD and to determine the biomechanical effects of mouse design, and 3) to determine the effect of mouse design on skill acquisition and proficiency. The hypotheses to be tested are as follows: 1) use of a standard mouse will be associated with fixed wrist extension, fixed wrist ulnar deviation, use of wrist radial- ulnar deviation for mouse operation, and continuous, submaximal electromyographic (EMG) activity by the forearm pronators and wrist extensors and ulnar deviators; 2) the new mouse design will reduce these biomechanical constraints; 3)novice mouse users will demonstrate an increased rate of skill acquisition with the new mouse design as indicated by improvement over time in the skill level, speed, accuracy, and motor coordination pattern with which a mouse input task is performed; and 4) both highly skilled and novice mouse users will demonstrate better ultimate skill with the new mouse design. One-hundred twenty-five skilled and novice occupational mouse users will be tested five times over seven weeks on a graphical mouse targeting task using a standard mouse and a new mouse designed for this project. 3D kinematics and EMG of the forearm and wrist will be measured on three of the visits. A two factor hierarchical ANOVA will be used to compare ultimate mouse skill across user skill category and mouse design. ANCOVA will be used to compare the rates of mouse skill improvement across user skill category and mouse design. Student's t-tests will be used to compare the fixed postures and ranges of motion required for mouse use across mouse design. Kinematic and EMG patterns will be used to compare changes in motor coordination patterns across skill category and mouse design. The study will document the extent of CTD risk factors among occupational mouse users. It will result in a new mouse designed to reduce these risks. It will explore the impact of the constraints of mouse use on the acquisition of a complex functional task. it will investigate the effectiveness of an ergonomic solution intended to balance the problems of worker risk and the upper limits to skilled worker performance. Such knowledge will foster the prevention of CTD in computerized offices and enhance understanding of the limits to skill imposed by constraints in the human-machine interface.