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Displacement between the seating surface and hybrid test dummy during transitions with a variable configuration wheelchair: A technical note

Cooper, RA and Dvorznak, MJ and Rentschler, AJ and Boninger, ML (2000) Displacement between the seating surface and hybrid test dummy during transitions with a variable configuration wheelchair: A technical note. Journal of Rehabilitation Research and Development, 37 (3). 297 - 303. ISSN 0748-7711

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Changing seating posture can extend the amount of time a person can safely remain seated without damaging tissue or becoming fatigued. The Excelsior is an electrically powered wheelchair that utilizes sit-to-stand (STS) and sit-to-recline (STR) motions to aid in pressure relief. The motion of the wheelchair seating system must closely follow anatomical paths or ulcers may develop from the resulting shear forces. Displacement between the person and the wheel-chair seating surface is one measure of these shear forces. The displacement between a Hybrid II 50th percentile anthropometric test dummy (ATD) and the seating surface of the Excelsior wheelchair was examined during STS and STR with two cushions, a Jay Active and a low-profile Roho cushion. The difference between the backrest and ATD back angles were 4.29°± 2.13°and 1.78°± 1.73° for the Roho and Jay cushions respectively during STS and 3.32° ± 4.21°and 10.71°± 6.20°during STR. These were statistically significant at p<.05. During STS, shear displacement between the Hybrid II back and Excelsior backrest did not exceed 1.5 cm for either cushion. ATD thigh-to-seat displacements were 2.5 cm for the Jay and 3.0 cm for the Roho cushion. STR produced dummy thigh-to-seat displacements of 1.5 cm and 3.5 cm for the Jay and Roho cushions respectively. Shear displacement in the ATD back was about 3.5 cm for the Roho and 6 cm for the Jay. The latter displacement should be reduced; however, the other conditions are marginal or acceptable. Hysteresis was acceptable or better for all cushion/motion combinations, with the highest net displacement of about 2.5 cm.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Dvorznak, MJ
Rentschler, AJ
Boninger, MLboninger@pitt.eduBONINGER
Centers: Other Centers, Institutes, Offices, or Units > Human Engineering Research Laboratories
Date: 1 May 2000
Date Type: Publication
Journal or Publication Title: Journal of Rehabilitation Research and Development
Volume: 37
Number: 3
Page Range: 297 - 303
Schools and Programs: School of Health and Rehabilitation Sciences > Rehabilitation Science and Technology
Refereed: Yes
ISSN: 0748-7711
MeSH Headings: Biomechanics; Biomedical Engineering--methods; Equipment Design--methods; Equipment Safety; Humans; Manikins; Posture; Sensitivity and Specificity; Surface Properties; Wheelchairs
PubMed ID: 10917261
Date Deposited: 03 Oct 2012 20:39
Last Modified: 05 Feb 2019 03:55


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