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Eric A. Callaghan

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Publications by Eric A. Callaghan (bibliography)

1995

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Henning, Robert A., Callaghan, Eric A., Guttman, Jason I. and Braun, Heather A. (1995): Evaluation of Two Self-Managed Rest Break Systems for VDT Users. In: Proceedings of the Human Factors and Ergonomics Society 39th Annual Meeting 1995. pp. 780-784.

“Two self-managed rest break systems for video display terminal (VDT) users were evaluated using measures of heart rate and heart rate variability, breathing, and work-physiological synchronization in addition to conventional measures of performance, mood, user acceptance, and musculoskeletal discomfort. Undergraduate typists (N=30) entered lines of randomized words during a 55-min work period. Cognitive demand was increased by having typists reverse-type a specified word in each line. In the feedback condition, typists were continuously informed of the discrepancy between a target rest break standard of 30 s every 8 min and their discretionary rest breaks. This feedback information was absent in the control condition. Management of discretionary rest breaks was better in the feedback condition and VDT users reported less task disruption and lower back discomfort. Time-related trends in performance and physiological response reflected behavioral changes associated with fatigue, but did not differentiate between experimental conditions. The lack of adverse psychophysiological responses in the feedback condition supports the conclusion that continuous feedback about rest break behavior can help VDT users self-manage discretionary rest breaks, with no untoward effects on performance or well-being.”

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