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Simple calculation of joint moment for lower extremity during sit to stand motion

Simple calculation of joint moment for lower extremity during sit to stand motion
Translated Title
앉았다 일어서는 동작의 하지 관절 모멘트를 간단하게 계산하는 방법
Hwang, Seo Yoon
DGIST Authors
Hwang, Seo Yoon; Kim, Jong Hyun; Lee, Yang Soo
Kim, Jong Hyun
Lee, Yang Soo
Issue Date
Available Date
Degree Date
2017. 2
Muscular strengthSit to standMaximum joint moment근력앉았다 일어서기최대 관절 모멘트
Muscular strength of elderly people decreased when they get older. Decreased muscular strength made decrease in quality of life of the elderly. Therefore, muscular evaluation was needed. Maximum joint moment during sit to stand could be evaluation method to maximum muscular strength to do activities of daily lives of elderly. Existed system to measure joint moments during sit to stand motion was not clinically friendly. Therefore, goal of the study was to make simplified system to measure joint moment during sit to stand motion. To make simplified system, simplified equation which joint position and ground reaction force was used to decrease sensors to detect kinematic components. Joint position during sit to stand was estimated based on the sitting posture. Shank angle displacement during sit to stand was measured by IMU to add sitting shank angle. Thigh angle was estimated by relationship between thigh segment and edge of chair. Joint moment for lower extremity was calculated by estimated segment angle. To see accuracy, joint moment from propsoed system was compared with joint moment from Mocap.. Most of maximum lower extremity joint moment error was less than the 20% in symmetric and asymmetric sit to stand. Also correlation coefficient was over 0.95. For the future research, method to estimated segment angle needed to be modified to increase accuracy and validation to the elderly. ⓒ 2017 DGIST
Table Of Contents
Ⅰ. INTRODUCTION 1-- 1.1 Background 1-- 1.2 Joint moment calculation during sit to stand 1-- 1.3 Goal of study 3-- Ⅱ. NOMENCLATURE 5-- Ⅲ. PROPOSED SYSTEM 6-- 3.1 Apparatus 6-- 3.2 Joint moment equation 7-- 3.3 Joint position estimation 8-- 3.3.1 Sitting posture 9-- 3.3.2 Sit to stand motion 9-- Ⅳ. EXPERIMENT 12-- 4.1 Subject 12-- 4.2 Experiment setting 12-- 4.3 Experiment task 13-- 4.4 Analysis method 14-- 4.4.1 Data processing 14-- 4.4.2 Sit to stand event detection 14-- 4.4.3 Comparing joint moment 15-- Ⅴ. RESULT 17-- 5.1 Pre-experiment 17-- 5.2 Symmetrical sit to stand 17-- 5.3 Asymmetrical sit to stand 19-- Ⅵ. DISCUSSION 22-- 6.1 Comparing with conventional study 22-- 6.2 Cause and method to improvement of maximum joint moment percentage error over 20% 23-- Ⅶ. CONCLUSION 27-- APPENDIX 28-- REFERENCE 40
Robotics Engineering
Related Researcher
  • Author Kim, Jonghyun REL(Rehabilitation Engineering Laboratory)
  • Research Interests Rehabilitation engineering; Robotics; Nonlinear control
Department of Robotics EngineeringThesesMaster

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