Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16046
Title: Joint torques during sit-to-stand in healthy subjects and people with Parkinson's disease
Authors: Mak, MKY 
Levin, O
Mizrahi, J
Hui-Chan, CWY
Keywords: Functional evaluation
Ground reaction force
Joint torque
Parkinson's disease
Sit-to-stand
Issue Date: 2003
Publisher: Pergamon Press
Source: Clinical biomechanics, 2003, v. 18, no. 3, p. 197-206 How to cite?
Journal: Clinical biomechanics 
Abstract: Objectives. To compare lower limb joint torques during sit-to-stand in normal elderly subjects and people with Parkinson's disease, using a developed biomechanical model simulating all phases of sit-to-stand. Design. A cross-sectional study utilizing a Parkinsonian and a control group. Background. Subjects with Parkinson's disease were observed to experience difficulty in performing sit-to-stand. The developed model was used to calculate the lower limb joint torques in normal elderly subjects and subjects with Parkinson's disease, to delineate possible causes underlying difficulties in initiating sit-to-stand task. Methods. Six normal elderly subjects and seven age-matched subjects with Parkinson's disease performed five sit-to-stand trials at their self-selected speed. Anthropometric data, two-dimensional kinematic and foot-ground and thigh-chair reactive forces were used to calculate, via inverse dynamics, the joint torques during sit-to-stand in both before and after seat-off phases. The difference between the control and Parkinson's disease group was analysed using independent t-tests. Results. Both control and Parkinson's disease groups had a similar joint kinematic pattern, although the Parkinson's disease group demonstrated a slower angular displacement. The latter subjects produced significantly smaller normalized hip flexion torque and presented a slower torque build-up rate than the able-bodied subjects (P<0.05). Conclusion. Slowness of sit-to-stand in people with Parkinson's disease could be due to a reduced hip flexion joint torque and a prolonged rate of torque production.
URI: http://hdl.handle.net/10397/16046
ISSN: 0268-0033
EISSN: 1879-1271
DOI: 10.1016/S0268-0033(02)00191-2
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