Many advanced ergonomic chairs currently available allow operators to utilize a dynamic mode of operation in which supporting surfaces (seat pan and backrest) have some degree of motion in response to body movement. However, there is a lack of behavior data demonstrating the effectiveness of this option. The current study involves a postural analysis of VDT operators who alternated between copy-intensive and screen-intensive tasks while utilizing a chair which allowed dynamic movement between forward tilting and backwards leaning postures. Results indicated that subjects tended to utilize the extreme positions of the chair.
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