Original Research ARTICLE
The crucial changes of sit-to-stand phases in subacute stroke survivors identified by movement decomposition analysis
- 1First Affiliated Hospital of Sun Yat-sen University, China
Objective: The aim of this study was to detect the key changes during sit-to-stand (STS) movement cycle in hemiparetic stroke survivors using a five-phases kinematic and kinetic analysis.
Methods: Twenty-five subacute stroke survivors and seventeen age-matched healthy adults participated in this study. The kinematic and kinetic parameters during STS cycle were measured using three-dimensional motion analysis system with force plates. The five standard phases of STS cycle were identified by six timing transitional points.
Results: Longer total time as well as larger changes were observed at the initial phase (phase I, 0.76±0.62s VS 0.43±0.09s; p=0.049) and at the end of hip and knee extension phase (phase IV, 0.93±0.41s VS 0.63±0.14s; p=0.008) in the stroke group than healthy group. Time to maximal knee joint moment was significantly delayed in the stroke group than in the control group (1.14±1.06s VS 0.60±0.09s, p<0.001). The maximal hip flexion was lower during the rising phase from seated position on the affected side in the stroke group than in the control group (84.22±11.64°VS 94.11±9.40°; p=0.022). Ground reaction force was lower (4.61±0.73N VS 5.85±0.53N, p<0.001) in the affected side of the stroke group than in the control group. In addition, knee joint flexion was significantly lower at just-standing phase (T4) and at end point (T5) (5.12±5.25° VS 8.21±7.28°, p=0.039; 0.03±5.41° VS 3.07±6.71°, p=0.042) on the affected side than the unaffected side. Crucial decrease of knee joint moment at abrupt transitory (T2) and the maximal moment was also observed on the affected side in comparison with the unaffected side (0.39±0.29 Nm/kg VS 0.77±0.25 Nm/kg, p<0.001; 0.42±0.38 Nm/kg VS 0.82±0.24 Nm/kg, p<0.001).
Conclusions: The findings of movement decomposition analysis provided useful information to clinical evaluation of STS performance, and may potentially contribute to the design of rehabilitation intervention program for optimum functional recovery of STS after stroke.
Keywords: Sit to stand, subacute stroke, Kinematic analysis, Kinetics, Rehabilitation
Received: 08 Nov 2017;
Accepted: 09 Mar 2018.
Edited by:Valerie M. Pomeroy, University of East Anglia, United Kingdom
Reviewed by:Xu Zhang, University of Science and Technology of China, China
Maurizio Acampa, Azienda Ospedaliera Universitaria Senese, Italy
Copyright: © 2018 Mao, Zhao, Lo, Chen, Ding, Xu, Bian, Huang and Li. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Dr. Le Li, First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China, firstname.lastname@example.org