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ReferencesNavigation arrowAuthorsNavigation arrowM. A. Holbein
Jun 18

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M. A. Holbein

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Publications by M. A. Holbein (bibliography)

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1995
 
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Holbein, M. A. and Chaffin, D. B. (1995): Stability Limits in Extreme Postures: Effects of Load Positioning and Foot Placement. In: Proceedings of the Human Factors and Ergonomics Society 39th Annual Meeting 1995. pp. 655-659.

“Although injuries related to postural stability are prevalent, ergonomic job analyses have traditionally not addressed stability issues. In this research, functional stability limits are quantified for persons standing in extreme postures under various external load and foot positioning conditions. Six subjects were tested while standing unladen and while holding a 5.2 kg load. The foot positions, or bases of support (BOS), were varied in width of the stance and sagittal separation of the feet. They were asked to lean and displace their center of gravity (COG) as far as possible in eight directions to the sides and front of the body. Stability measures based on these COG displacements were calculated. All controlled variables significantly affected the stability measures. When standing unladen, subjects extended their COG to within 99% of their BOS limit. Movement was much more restricted when leaning while handling a load (89%), especially holding it with one hand on the shoulder (84%). On average, increased separation of the feet in a particular direction resulted in larger COG displacements in that direction. The results are discussed relative to their effects on balance and stability modeling.”

© All rights reserved Holbein and Chaffin and/or Human Factors Society

1994
 
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Holbein, M. A. and Redfern, M. S. (1994): Postural Stability while Walking and Carrying Loads in Various Postures. In: Proceedings of the Human Factors and Ergonomics Society 38th Annual Meeting 1994. pp. 564-567.

“Falls, over-exertion injuries and other potential consequences of balance losses continue to be serious ergonomic concerns. Stability issues are important in the prevention of these injuries, especially when the task is complicated by handling loads. However, stability analyses are not typical components of ergonomic job analyses. This study demonstrated that stability assessments can be effective in recommending load-carrying strategies. In particular, the effects of load positioning and magnitude on stability were investigated. Unladen walking was also tested for comparison. Several stability measures were defined based on the body-and-load's center of mass displacement in the frontal plane. Statistical differences among the load positions and magnitudes were found and are discussed. Results were consistent across measures. Additional work is needed to better define the limits of stability while carrying and to relate these, or other, stability measures to the likelihood of a balance loss.”

© All rights reserved Holbein and Redfern and/or Human Factors Society

 
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Changes to this page (author)

27 Jun 2007: Modified
26 Jun 2007: Added

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Jun 18

“ Computer programs emerge as the outcome of complex human processes of cognition, communication and negotiation, which serve to establish the meaningful embedding of the computer system in its intended use context. ”

-- Floyd, 1992, p. 24

 
 

Featured chapter

Read the fascinating history of Wearable Computing, told by its father, Steve Mann

Read Steve's chapter !

 
 

Latest books

The Social Design of Technical Systems: Building technologies for communities
by Brian Whitworth and Adnan Ahmad

 
Start reading

The Encyclopedia of Human-Computer Interaction, 2nd Ed.
by Mads Soegaard and Rikke Friis Dam

 
Start reading
 
 

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