Joint torques during sit-to-stand in healthy subjects and people with Parkinson's disease

Kit Yi Mak, Oron Levin, Joseph Mizrahi, Christina W.Y. Hui-Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

149 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)197-206
Number of pages10
JournalClinical Biomechanics
Issue number3
Publication statusPublished - 1 Jan 2003


  • Functional evaluation
  • Ground reaction force
  • Joint torque
  • Parkinson's disease
  • Sit-to-stand

ASJC Scopus subject areas

  • Biophysics
  • Orthopedics and Sports Medicine


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