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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/25235

Title: A step in the right direction: how does curb negotiation affect dynamic stability?
Authors: Norrish, Katherine
O'Reilly, Kathleen
Whitney, Kristin
Campbell, Rachel
MacDonell, Kristen
Advisor: Zabjek, Karl
Zeller, Reinhard
Narayanan, Unni
Tse, Shirley
Department: Physical Therapy
Keywords: dynamic stability
center of mass
center of pressure
inclination angle
Issue Date: 2009
Abstract: Background: Falls are prevalent in populations with neuromuscular disorders and are attributed to decreased dynamic stability and environmental barriers such as curbs. Investigation of dynamic stability in the able-bodied population during curb negotiation is integral to understanding the challenges faced by those at risk for falls. The purpose of this study was to identify differences in dynamic stability using medial-lateral center of mass and center of pressure (COM-COP) inclination angles during level ground walking, curb ascent, and curb descent. Methods: Ten healthy young adults were recruited to perform level ground walking, curb ascent and descent tasks. Data from an eight camera VICON motion capture system and three force plates were used to calculate medial-lateral COM-COP inclination angles. Findings: Peak medial-lateral COM-COP inclination angles were significantly larger (P<0.01) during both curb ascent and descent compared to level ground walking. In addition, average medial-lateral COM-COP inclination angles were significantly greater in the lead limb during curb ascent and in the trail limb during curb descent (P<0.01). Interpretation: Curb negotiation poses a greater challenge to dynamic stability in the medial-lateral direction compared to level ground walking in able-bodied young adults. Decreased medial-lateral stability exists during single leg support of the lead limb during curb ascent and of the trail limb during curb descent. This finding is in agreement with current physiotherapy clinical practice, which encourages patients to step up with the unaffected limb, and down with the affected limb.
Description: Affiliated institutions include: Hospital for Sick Children (U. Narayanan, S. Tse, R. Zeller), University of Toronto (K. Zabjek)
URI: http://hdl.handle.net/1807/25235
Appears in Collections:Student Research and Publications

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