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Body posture as an indicator of workload in mental work
OBJECTIVE: For this article, the relationships between body posture and workload for four mental tasks simulated on a computer were studied. BACKGROUND: Human behaviors are observable during work and are related to human mental activities. A novel supplementary method, based on human behavior but not directly related to task execution, is proposed to assess the workload in mental work situations. METHOD: Body posture was quantitatively analyzed with the use of a video-based analysis system. The distance between a participant's head and the display, the distance between the shoulder and the...
Demands on the Knee During Kneeling and Squatting Activities Common to Low-seam Mining
In 2009, the operating height of approximately one fourth of underground coal mines in the U.S. restricted mine workers to kneeling, crawling, and/or stooping posture to perform work [MSHA 2009). The large number of knee injuries to these workers is likely attributed to exposure to musculoskeletal disorder risk factors (prolonged kneeling, crawling, and twisting on one's knees). Therefore, the National Institute for Occupational Safety and Health has investigated three different biomechanical parameters (muscle activity of the knee flexors and extensors, pressure at the knee, and the net forces...
Systematic evaluation of observational methods assessing biomechanical exposures at work
by Takala E-P , Pehkonen I , Forsman M , Hansson G-Å , Mathiassen SE , Neumann WP , Sjøgaard G , Veiersted KB , Westgaard RH , Winkel J Objectives This systematic review aimed to identify published observational methods assessing biomechanical exposures in occupational settings and evaluate them with reference to the needs of different users. Methods We searched scientific databases and the internet for material from 1965 to September 2008. Methods were included if they were primarily based on the systematic observation of work, the observation target was the human body, and the method...

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