Evaluation of Seat Pan Inclination During Sit-to-stand for Development of Elderly Lifting-chair Hong, Jae-Soo; Kim, Jong-Hyun; Chun, Keyoung-Jin;
Objective: The aim of this study is to set the design direction of the lift chair's tilting seat for development. Background: Great attention has been shown to the development of senior friendly product, because of increasing elderly population rapidly in Korea. Therefore, we need to study on sit-to-stand(STS) motion of elderly systematically for developing lift chair that is one of senior friendly products. Method: In this study, we analyzed joint moment(knee, hip) and muscle activity (Erector spinae, Rectus femoris, Vastus lateralis) on STS motion of elderly(female, 60~70: 7) and young people(female, 20~30: 7) using 3 dimension motion capture camera, force plate, wireless EMG. Results: The results of muscle activity showed a similar trend but the results of joint moment were a lot of differences between the young and the elderly. Conclusion: The results of knee joint moment suggest the angle(10~30deg)-adjustable seat that can be better than to find the optimal seat's angle. Application: The method and results of this study are expected to develop senior friendly product and verification as well as be available to various application.
Development of Non-Motorized Lifting Chair For the Elderly, Journal of Society of Korea Industrial and Systems Engineering, 2015, 38, 4, 226
Bazrgari, B. and Shirazi-Adl, A., Arjmand, N., Analysis of squat and stoop dynamic liftings: muscle forces and internal spinal loads, Eur Spine J vol. 16(5), 687-99, 2007.
John Rasmussen and Soren Torholm, Mark de Zee, Computational analysis of the influence of seat pan inclination and friction on muscle activity and spinal joint forces, International Journal of Industrial Ergonomics, 39, 52-57, 2009.
Jung, K. T., et al., "Usability Evaluation for Senior Friendly Products", Ergonomics Society of Korea, 2007.
Kathleen A. Bieryla and Dennis E. Anderson, Michael. Mdigan, Estimation of relative effort during sit-to-stand increase when accounting for variations in maximum voluntary torque with joint angle and angular velocity, Journal of electromyography and Kinesiology, 19, 139-144, 2009.
Kim, J. H. and Jung, K. T., User Analysis and Quality Function Deployment for the Design of a Four-Wheeled Walker, KUT, 2008.
Mark S. Thompson, Michalel Voigt and Mark de Zee, "Evaluation of lower extremity musculo-skeletal Model using sit-to-stand movement", International Society of Biomechanics 19th Congress: the human body in motion, 2003.
Peter Konrad, A Practical Introduction to Kinesiological Electromyography, 32p, Noraxon INC. USA, 2005.
SAFIA Korea, Survey of Falling accident, 2007.
Statics Korea, Elderly population statistics, 2008.
Yasin, B. Seven and N. Ekin Akalan, Can A. Yucesoy, Effects of back loading on the biomechanics of sit-to-stand motion in healthy children, Human Movement Science, 27, 65-79, 2008.
Winter, D. A, Biomechanics and motor control of Human Movement Science, New York: John Wiley and Sons, 1990.