Affiliations: Biomechanics-Ergonomics Research Laboratory,
University of Cincinnati, Cincinnati, OH, USA. | Division of Biostatistics & Epidemiology,
Department of Environmental Health, College of Medicine, University of
Cincinnati, Cincinnati, OH, USA. | Eastman Kodak Ltd., Rochester, NY, USA.
Note:  Corresponding author: Angshuman Bagchee, Biomechanics-Ergonomics
Research Laboratory, University of Cincinnati, Cincinnati, OH 45221, USA.
E-mail: [email protected]
Abstract: The methodology described here presents quantitative measures of
estimating the severity of postural instability based on the proximity and
spread of body sway in relation to the basal area of support. A simplified
functional basal area of support is determined based on the maximal forward
reaching ability of the subject. Three non-dimensional indices for quantitating
the potential of postural instability are introduced. Application of this
method is illustrated through an experiment with ten healthy industrial workers
performing four different tasks. The results indicate that these indices are
reproducible, sensitive to task performance and can be utilized to estimate the
postural stability associated with each task. Application of this method would
include the identification of factors, both intrinsic and extrinsic, that
contribute to the maintenance of postural balance during task performance.
Interventions can then be evaluated using this method.