Endurance in restricted postures

Document Type

Conference Proceeding

Publication Date

1-1-1990

Abstract

This paper presents results of a study to find a relationship between the strength required to perform a task and the endurance time in restricted postures. A laboratory experiment was conducted to find the endurance for workers exerting selected percentage of their maximum strength in certain restricted postures. Endurance times of 15 college students were measured at various predetermined strength in postures such as standing, sitting, and lying on the stomach with and without elbow support. It was found that the endurance time was significantly reduced in the restricted postures. Experimental analysis clearly reveals that the average endurance time in the sitting position was only 5.15 minutes when 23 pounds of strength exertion was required; while the endurance time in standing position was more than 90 minutes. The reduction was more significant in the case of postures involving lying on stomach. Subjects could not endure any weight heavier than 10 pounds for longer than 5 minutes. The endurance time was also significantly reduced when the required force level was more than 25% of the maximum strength. A regression model which estimates maximum strength that can be sustained for a given endurance time has been developed and presented.

Publication Source (Journal or Book title)

Proceedings of the Human Factors Society

First Page

697

Last Page

701

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