Principal component analysis of upper-extremity joint moment variability during hammering

IF 0.5 Q4 ERGONOMICS

International Journal of Human Factors and Ergonomics Pub Date : 2020-09-23 DOI:10.1504/ijhfe.2020.10031665

J. Langenderfer, Sumaya Ferdous, N. Balendra

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引用次数: 1

Abstract

The goal of this study was to examine effects of hammer symmetry of inertia on upper-extremity joint moment variability. Moment variability is important in quantifying tissue exposure to stress variations. Nineteen male participants (age: 20-40 year) swung four hammers with known inertial properties while movement was recorded. Joint moment components were calculated with inverse dynamics. Moment component variability was explained with principal component analysis. Higher inertia symmetry hammers resulted in greater explained variability (up to 18%) for wrist internal-external, elbow abduction-adduction and elbow flexion moment components. For the most inertia symmetric hammer a different structure of moment variability between principal components was found for some moment components. These results suggest that more inertia symmetric hammers result in decreased moment diversity. Decreased moment diversity represents a more constant dose of loading exposure applied to some upper-extremity tissues and may indicate less variable stresses and increased potential for musculoskeletal disorder.

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锤击过程中上肢关节力矩变化的主成分分析

本研究的目的是研究惯性锤对称对上肢关节力矩变异性的影响。力矩变异性在定量组织暴露于应力变化时是重要的。19名男性参与者(年龄:20-40岁)在运动时挥舞着四只已知惯性特性的锤子。采用逆动力学方法计算关节力矩分量。用主成分分析解释矩分量变异。较高的惯性对称锤导致手腕内-外、肘关节外展-内收和肘关节屈曲力矩分量更大的可变性(高达18%)。对于大多数惯性对称锤，某些矩分量在主分量之间存在不同的矩变结构。这些结果表明，更多的惯性对称锤会导致矩多样性降低。减小的力矩多样性表示施加于某些上肢组织的载荷暴露剂量更恒定，可能表明可变应力更少，肌肉骨骼疾病的可能性增加。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Human Factors and Ergonomics Social Sciences-Human Factors and Ergonomics

CiteScore

1.10

自引率

0.00%

发文量

期刊介绍： IJHFE publishes high quality international interdisciplinary peer-reviewed manuscripts covering ergonomics and human factors in the design, planning, development and management of technical and social systems for work or leisure, including technical systems, equipment, products and the organisation of work. Topics covered include Environmental and physical ergonomics Human-machine systems design/tool/equipment design Eliciting human requirements on technology Usability/comfort/pleasure/cognitive engineering of human-technology interfaces Anthropometrics/design for people with disabilities Design of critical systems/equipment for extreme environments Human performance measurement and modelling Humans in transportation systems/technologically complex systems Cognitive ergonomics, information processing, information/multimedia design, expert systems Acceptability and effectiveness of technology change Training design, organisational design and psychosocial factors Management of the complex participation of people in their environment Human-centred/goal-driven design of technical/organisational systems. Topics covered include: -Environmental and physical ergonomics -Human-machine systems design/tool/equipment design -Eliciting human requirements on technology -Usability/comfort/pleasure/cognitive engineering of human-technology interfaces -Anthropometrics/design for people with disabilities -Design of critical systems/equipment for extreme environments -Human performance measurement and modelling -Humans in transportation systems/technologically complex systems -Cognitive ergonomics, information processing, information/multimedia design, expert systems -Acceptability and effectiveness of technology change -Training design, organisational design and psychosocial factors -Management of the complex participation of people in their environment -Human-centred/goal-driven design of technical/organisational systems