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Studying the Effect of Motor Learning on Joint Motion Coordination during Balance Control

Esmaeili, Sina | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53707 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Farahmand, Farzam; Baniasad, Mina
  7. Abstract:
  8. The problem of degrees of freedom states that there are several ways to take advantage of the multiple joints of the body to perform a motor skill. This issue was first raised by Nikolai Bernstein. In previous studies on the Bernstein hypothesis, movement coordination has often been evaluated by calculating variance changes in joint movements and using statistical indicators, and synergy analysis has not been used.In this study, the effect of exercise on balance skills in healthy individuals was investigated using synergy analysis. For this purpose, movement data of 8 healthy individuals were recorded in two sessions before and after exercise while maintaining their balance on the balance sheet. Between sessions, individuals were asked to practice on a balance sheet for 6 hours. Structures and activation curves of motor synergies were extracted using the non negative matrix factorization (NNMF) algorithm. Then structures with a weight pattern similar to clustering were identified and compared. The results showed that before exercise, there are five structures of motor synergy, each of which can be associated with a balance strategy. With exercise and improvement of balance indices, the number of motor synergies was reduced to 4. Also, for structures with a similar weight pattern, it was observed that exercise causes a significant change in the weight of some degrees of freedom of movement and also increases the amount of stability, reproducibility and resolution of the structures. Also, by comparing the activation curves, it was observed that after training, the use of anterior ankle strategy is reduced and the knee strategy is used more. The results of this study can be used in patients' balance rehabilitation as well as increasing the learning speed of professional athletes
  9. Keywords:
  10. Motor Learning ; Locomotion Control ; Non-Negative Matrix Factorization (NMF) ; Matrix Factorization ; Bernstein Inequality ; Kinematic Synergy

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