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Title: Turning strategy in patients with Parkinson’s disease
Authors: Mak, MKY 
Hui-Chan, CWY
Patla, AE
Issue Date: 2005
Publisher: Elsevier
Source: Gait and posture, 2005, v. 21, suppl 1, p. s95-96 (Abstracts) How to cite?
Journal: Gait and posture 
Abstract: Introduction: Changing the direction of walking involves temporal re-orientation of body segment with respect to each other in time and in space, so as to align the feet with the new direction [1]. This study aimed to examine the temporal sequence and spatial adjustments of the body segments during turning in patients with Parkinson's disease (PD).
Methods: Five PD patients (on medication and with mean Hoehn and Yahr Staging of 2.8±0.7) and 5 healthy elderly completed the study. Subjects were visually cued to walk straight or to turn either 300 or 600 to the left or right, at the mid-point of a 9-m walkway. Three dimensional kinematic data were recorded using a VICON motion analysis system: (1) onset time of key body segments in response to the turning cue, (2) step length and (3) stance width at the first ipsilateral foot contact (IFC1) marking the beginning of turn, at the subsequent contralateral foot contact (CFC), and second ipsilateral foot contact (IFC2) marking the completion of turn.
Results: The body segment of PD patients and healthy subjects followed the same temporal sequence of head yaw, trunk yaw, lateral displacement of CoM, and lateral displacement of the foot, with the total time taken to complete the turn being longer in the patients (p < 0.05). When the turn increased from 30 o to 60 °, both groups decreased their step length and increased theft stance width at IFC2 (p <0.001), with the increase in stance width smaller in PD patients than healthy subjects for CFC and IFC2 (p < 0.05).
Discussion and conclusions: Both healthy subjects and PD patients used a similar temporal sequence to turn, suggesting that patients were able to select appropriate motor programme despite a slower turn [2]. However, because PD patients turned with a narrower stance width, they could have a greater tendency to fall than healthy elderly.
Description: XVII the Conference in Postural and Gait Research, Marseille, France, 29 May 2005-2 Jun 2005
ISSN: 0966-6362
EISSN: 1879-2219
DOI: 10.1016/S0966-6362(05)80315-7
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