Comparison of spinal profiles while standing, supine, prone, and seated in four chair types. A pilot study

Wayne P. Adams, Terry L. Stenz, Brian L. Stonecipher, Susan Hallbeck

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A 3-dimensional digitizer was used to evaluate the spinal profiles of 16 subjects. These subjects (8 female, 8 male) are from 4 age ranges: 12-14, 20-22, 40-42, and 60-62 years of age. Each subject was measured in 7 different body positions to include: standing, supine, prone, and seated on one of 4 different chair styles. The 4 chairs were a metal folding chair, a stackable plastic molded chair, a 5-caster padded 'secretarial' chair, and an ergonomic kneeling 'posture' chair similar to a Balans chair. The measured spinal profiles were separated into 4 spinal angles (measured with respect to a vertically projected line), the cervical, thoracic, lumbar, and sacral angles. Each spinal angle was the dependent variable for an ANOVA analysis. The independent variables were posture, age, gender, and subject. The ANOVA analysis showed that the main effect of posture was significant for the thoracic, lumbar, and sacral angles. Post hoc testing demonstrated that the supine thoracic angle differed significantly from the other 6 body postures, which were grouped together. The mean lumbar angle had two groupings. One group included the standing, prone, and supine postures, while the other group was comprised of the seated postures. The sacral angle for the standing, prone, and supine postures did not differ significantly, but were different from the seated postures. The sacral angle for the ergonomic posture chair was significantly different from the other chairs, with the magnitude of its mean angle between the standing, prone, and supine group, and the group of other seated postures.

Original languageEnglish (US)
Title of host publicationProceedings of the Human Factors Society
Editors Anon
PublisherPubl by Human Factors Soc Inc
Pages679-683
Number of pages5
StatePublished - 1990
Externally publishedYes
EventProceedings of the Human Factors Society 34th Annual Meeting - Orlando '90 - Orlando, FL, USA
Duration: Oct 8 1990Oct 12 1990

Other

OtherProceedings of the Human Factors Society 34th Annual Meeting - Orlando '90
CityOrlando, FL, USA
Period10/8/9010/12/90

ASJC Scopus subject areas

  • Engineering(all)

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  • Cite this

    Adams, W. P., Stenz, T. L., Stonecipher, B. L., & Hallbeck, S. (1990). Comparison of spinal profiles while standing, supine, prone, and seated in four chair types. A pilot study. In Anon (Ed.), Proceedings of the Human Factors Society (pp. 679-683). Publ by Human Factors Soc Inc.