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INVESTIGATION OF TERRAIN EFFECTS ON WHEELCHAIR PROPULSION AND VALIDITY OF A WHEELCHAIR PROPULSION MONITOR

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Lin, Jui-Te (2011) INVESTIGATION OF TERRAIN EFFECTS ON WHEELCHAIR PROPULSION AND VALIDITY OF A WHEELCHAIR PROPULSION MONITOR. Master's Thesis, University of Pittsburgh. (Unpublished)

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Abstract

This thesis is composed of two studies related to wheelchair propulsion biomechanics. The first study investigated the impact of cross-slope and surface roughness on wheelchair propulsion. Fifteen manual wheelchair users propelled across a five-meter platform which were set to level, 1°, or 2° cross slope, and attached with one of three surfaces including Teflon (slippery), wood (normal), and blind guide (rough). The study found main effects of both cross slope and surface roughness on stroke number and sum of work, and a main effect of cross slope on velocity. Subjects travelled slower, used more strokes, and expended more work with increasing cross slope. Subjects also used more strokes when propelling on the slippery and rough surfaces than on the level surface. They expended more work when propelling on the rough surface than on the level surface. When looking into bilateral propulsion parameters, we found that peak resultant force, peak wheel torque, and sum of work became significantly asymmetrical with the increase of cross slopes. Exposure to biomechanics loading can be reduced by avoiding slippery, rough, and cross slopes when possible. The second study consisted of a preliminary analysis on the validity of a wheelchair propulsion monitor (WPM) in estimating wheelchair propulsion biomechanics. The WPM integrates three devices including a wheel rotation datalogger, and an accelerometry-based device on the upper arm and underneath the wheelchair seat, respectively. Five wheelchair users were asked to push their own wheelchairs fitted with a SMARTWheel over level and sloped surfaces on two separate visits. The estimated stroke number and cadence by the WPM were consistent with the criterion measures by the SMARTWheel (ICC= 0.99 for stroke number, ICC=0.97 for cadence) with less than 5% absolute percentage errors for stroke number and 9% for cadence. The peak resultant force and wheel torque could be predicted to some extent by acceleration features on an individual subject basis. The study demonstrated the potential of the WPM in tracking wheelchair propulsion characteristics in the natural environment of wheelchair users.


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Details

Item Type: University of Pittsburgh ETD
Status: Unpublished
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Lin, Jui-Tejul51@pitt.eduJUL51
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairDing, Dandad5@pitt.eduDAD5
Committee CoChairCooper, RoryRCOOPER@pitt.eduRCOOPER
Committee MemberKoontz, Alicia Makoontz@pitt.eduAKOONTZ
Date: 1 September 2011
Date Type: Completion
Defense Date: 19 July 2011
Approval Date: 1 September 2011
Submission Date: 26 July 2011
Access Restriction: 5 year -- Restrict access to University of Pittsburgh for a period of 5 years.
Institution: University of Pittsburgh
Schools and Programs: School of Health and Rehabilitation Sciences > Health and Rehabilitation Sciences
Degree: MS - Master of Science
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: Acceleration; Biomechanics; Cross-Slope; Manual Wheelchair; Propulsion; Spinal cord injuries; Surface roughness; Terrain; Upper extremity
Other ID: http://etd.library.pitt.edu/ETD/available/etd-07262011-154929/, etd-07262011-154929
Date Deposited: 10 Nov 2011 19:54
Last Modified: 15 Nov 2016 13:47
URI: http://d-scholarship.pitt.edu/id/eprint/8640

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