Posture,Postural Discomfort,and Performance

Abstract

In order to justify the costs of using ergonomically designed workplaces, it is necessary to relate improved posture to improved performance. This experiment used twelve subjects, four in each of three postural conditions. Subjects inspected printed circuit boards for 3 h with two five-minute breaks per hour. Both postural condition and time on task affected measures of posture, measures of postural discomfort, and performance. Poor defect detection performance was associated with increased forward inclination of the trunk, increased perceived discomfort, and increased frequency of posture changes. Subjects tried to maintain their defect detection performance over time by spending longer on each board, but they were only partially successful. In addition to providing positive evidence to justify the cost of ergonomic changes in posture, the results provide a simple and consistent set of measures to be used in future work.

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References

Astley, R. W. , and Fox, J. G. (1975). The analysis of an inspection task in the rubber industry. In C. G. Drury and J. G. Fox (Eds.). Human reliability in quality control (pp. 253–272). London: Taylor and Francis.

Branton, P. (1967). An evaluation of train seats by observation of sitting behavior. Ergonomics. 10, 35–51.

Corlett, E. N. , and Bishop, R. P. (1976). A technique for assessing postural discomfort. Applied Ergonomics, 19, 175–182.

Corlett, E. N. , Madelcy, S. J. , and Mancncia, I. (1979). Posture targetting: A technique for recording working postures. Ergonomics, 22, 357–366.

Coury, B. G. , and Drury, C. G. (1982). Optimum handle positions in a box-holding task. Ergonomics, 25, 645–662.

Czaja, S.J. , and Drury, C.G. (1981). Training programs for inspection. Human Factors, 23, 473–484.

Drury, C. G. (1978). Integration of human factors into quality control. Human Factors, 20, 597–602.

Drury, C. G. , and Coury, B. G. (1982). A methodology for chair evaluation. Applied Ergonomics, 13, 195–202.

Elias, R. (1980). Investigations in operators working with CRT display terminals: Relationships between task content and psychophysiological alterations. In E. Grandjean and E. Vigliani (Eds.), Ergonomics Aspects of Visual Display Terminals (pp. 211–217). London: Taylor and Francis.

10.

Grandjean, E. (1981). Fitting the task to the man. London: Taylor and Francis.

11.

Hasslequist, R. J. (1981). Increasing manufacturing productivity using human factors principles. In Proceedings of the Human Factors Society 25th Annual Meeting (pp. 204–206). Santa Monica, CA: Human Factors Society.

12.

Hunting, W. , Grandjean, E. , and Maeda, K. (1980). Constrained postures in accounting machine operators. Applied Ergonomics, 11, 145–149.

13.

Hunting, W. , Laubli, T. , and Grandjean, E. (1982). Constrained postures at VDTs. Ergonomics, 25, 556–557.

14.

Kantowitz, B. H. , and Sorkin, R. D. (1983). Human factors: Understanding people-system relationships. New York: Wiley.

15.

Karhu, O. , Harkonen, R. , Sorvali, P. , and Vepsalainen, P. (1981). Observing working postures in industry: Examples of OWAS application. Applied Ergonomics, 12(11),13–18.

16.

Karhu, O. , Kansi, P. , and Kuorinka, I. (1977). Correcting working postures in industry: A practical method for analysis. Applied Ergonomics, 1977, 8,199–201.

17.

Komoike, Y. , and Horiguchi, S. (1971). Fatigue assessment on key punch operators, typists and others. Ergonomics, 14, 101–109.

18.

Kuorinka, I. , and Kosinen, P. (1979). Occupational rheumatic diseases and upper limb strain in manual jobs in a light mechanical industry. Scandinavian Journal of Work, Environment and Health, 6, Suppl. 3, 39–47.

19.

Liuzzo, J. G. , and Drury, C. G. (1980). An evaluation of blink inspection. Human Factors, 22, 201–210.

20.

Mackie, R. R. (1977). Vigilance. New York: Plenum.

21.

Mandai, A. C. (1982). The correct height of school furniture. Human Factors, 24, 257–269.

22.

Nachemson, A. , and Elfström, G. (1970). Intravital dynamic pressure measurements in lumbar discs. Scandinavian Journal of Rehabilitation Medicine, Suppl. 1, pp. 1–40.

23.

NASA . (1978). Anthropometries source book, Volume 1: Anthropometry for designers (NASA Reference Publication 1024). Washington, DC: Author.

24.

NIOSH . (1981). Work practices guide for manual lifting (DHEW [NIOSH] publication No. 81–122). Cincinnati, OH: Author.

25.

Shackel, B. , Chidsey, K. D. , and Shipley, P. (1969). The assessment of chair comfort. Ergonomics, 12, 269–306.

26.

Tsao, Y. C. , Drury, C. G. , and Morawski, T. B. (1979). Human performance in sampling inspection. Human Factors, 22, 99–105.