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Quantitative Assessment of Fatigue in Stroke Patients During Repetitive Exercises, Using Nonlinear Dynamics Methods

Razmand, Reza | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52771 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Zohoor, Hassan; Behzadipour, Saeed
  7. Abstract:
  8. Stroke is one of the most common neurological disorders, and inability to move is the most important complication. Rehabilitation exercises are currently the most effective treatment for these patients. Fatigue during rehabilitation exercises greatly reduces the effectiveness of the exercises. Therefore, it is very important to recognize the level of fatigue.Nowadays, most of the conventional methods for measuring fatigue is either based on signal analysis (EMG) which is experimental, or report by patients and doctors might be employed as a criterion. Fatigue leads to changes in the coordination of kinematics. Hence, the main purpose of this study is to quantify fatigue corresponding to stroke patients at the time of repeating exercises of upper limbs by using nonlinear dynamics based kinematic data analysis.To this end, kinematic data of upper limbs of the 7 stroke patients with a maximum age of 70 years have been obtained by Kinect sensors and its variations have been calculated by using the nonlinear method of cross recurrence plot. For this aim, the initial pattern of motion has been considered to be the non-fatigue pattern and the rest of patterns have been compared to it by the cross recurrence plot in the following. Furthermore, the cross recurrence plot has been analiyzed by the average diameter line length criterion and determinism during a period of time criterion. The result show that these two criterions result in decreasing rate that indicates the deviation of the motion patterns with respect to the initial pattern in a period of time due to mostly muscle fatigue. Eventually, correlation between the obtained results of this study, EMG basis and PSW kinematic index (studied by Zare) have been investigated. The results show a considerable correlation between the average diameter line length criterion, determinism and indexes achieved by Zare. Also, by comparing the kinematic indexes (average diameter line length, determinism and PSW) to EMG basis, one can conclude that the average diameter criterion shows the most correlation with EMG indexes of principle component analysis of wavelet an NSM (0.8929 and -0.8779, respectively). On the other hand, it seems that the determinism index graph has more resemblance to EMG indexes than the average diameter line length graph and PSW’s. In addition, comparing two indexes of average diameter line length and determinism to PSW, shows high correlation (-0.8375 and -0.7832, respectively) so that the reliability of the method of diagnosis of fatigue by kinematic variations for the sake of the evaluation of stroke patients fatigue can be easily approved
  9. Keywords:
  10. Stroke ; Rehabilitation ; Muscular Fatigue ; Cross Recurrence Plot ; Kinematic Variation ; Fatigue Quantitative Assessment

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