Title page for ETD etd-11182005-094704

Type of Document Master's Thesis
Author Cropper, Robin
URN etd-11182005-094704
Title Differences between Targeted and Measured Body Weight Support with the Usage of a Body Weight Support System
Degree Master of Science (M.S.)
Department Kinesiology
Advisory Committee
Advisor Name Title
Li Li Committee Chair
Dennis Landin Committee Member
Jan Hondzinski Committee Member
  • body weight support
Date of Defense 2005-11-16
Availability unrestricted
The purpose of the study was to determine if the body weight support system (BWSS) maintains the targeted percentage of the subject's body weight support (BWS) during walking and to explore the relationship between unloading and ground reaction force. Sixteen healthy college students (mean age: 22 years old) were recruited as subjects. Tests were conducted using an instrumented treadmill with a BWSS. The BWSS harness was secured around the lower abdomen and pelvis of each subject for effective body weight support. Vertical ground reaction force was measured by force platforms embedded in the treadmill. A force sensor was attached to the top of the harness to measure the actual amount of support force being exerted by the BWSS while the subject walked on the treadmill. The subject's body weight was supported at targeted levels of 0%, 15%, 30%, and 45%. Subjects walked at speeds of 0.447, 0.671, 0.894, and 1.117 meters per second for each level of targeted body weight support (TBWS). As speed increased, the maximum support force (SFmax) increased while the minimum support force (SFmin) decreased. As the levels of TBWS increased, the SFmax as well as the SFmin increased. The maximum support force was affected by the different body weight support levels and fluctuated from 5.08% to 11.22% above the TBWS. The minimum support force fluctuated from 0.40% below to 13.05% above the targeted body weight support. The fluctuations were also affected by walking speed. SFmax deviation ranged from 6.12% to 10.03% above TBWS across speeds while the SFmin deviated from 7.06 to 8.58% above TBWS across speeds. As speed increased, maximum ground reaction force also increased. As the levels of BWS increased, the maximum ground reaction force decreased. The BWSS did not sustain the targeted percentage of BWS and actually supported a lesser percentage of the subject's body weight throughout the trials. Vertical ground reaction forces were reduced with the use of the BWSS but were disproportional to the TBWS levels. These findings are important in providing both safe and efficient treatment for future patients in producing maximum benefits in therapy.
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