d9ffdf99-3ad5-43b0-99fd-095ceed70fda20220121081210430naun:naunmdt@crossref.orgMDT DepositInternational Journal of Mechanics1998-444810.46300/9104http://www.naun.org/cms.action?id=2828128202112820211510.46300/9104.2021.15https://www.naun.org/cms.action?id=23280ShahrolMohamaddanFaculty of Engineering, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Sarawak, MalaysiaAliffRahmanFaculty of Engineering, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Sarawak, MalaysiaMusdiShanatFaculty of Applied and Creative Arts, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Sarawak, MalaysiaSiti ZawiahMd DawalFaculty of Engineering, University of Malaya, 50603 Kuala Lumpur, MalaysiaAkihikoHanafusaCollege of Systems Engineering and Science, Shibaura Institute of Technology, Fukasaku 307, Minuma-ku, 337-8570 Saitama, JapanChair comes in different sizes and shapes depending on the functions as well as the users involved. However, the designers seldom consider the ergonomics aspect in chair design. This research has been conducted as a case study to compare and select the best design parameters within two chairs known as Chair A and B using human modelling software called AnyBody. Different parameter was manipulated in the simulation which is backrest angles for Chair A and seat heights for Chair B. A total of ten chairs with different parameters (five from Chair A and five from Chair B) were conducted in the simulation. Results were generated through inverse dynamics analysis in the form of muscle activities envelopes and reaction force on vertebrae L4 to L5. The result shows that 80° backrest was the best ergonomics design for Chair A while 0.30 m seat height was the best ergonomics design for Chair B. The simulation conducted is important as an early ergonomics intervention before the real chair fabrication is conducted.123120211231202126526931https://www.naun.org/main/NAUN/mechanics/2021/a622003-031(2021).pdf10.46300/9104.2021.15.31https://www.naun.org/main/NAUN/mechanics/2021/a622003-031(2021).pdfJ.E. Fernandez, Ergonomics in the workplace, Facilities 13(4) (1995) 20-27. P. Stephen, Bodyspace: Anthropometry, Ergonomics and the Design of Work, CRC Press, Florida, USA, 2014, pp. 1-352. 10.1016/j.apergo.2019.102894C. Bontrup, W.R. Taylor, M. Fliesser, R. Visscher, G. Tamara, P. Wippert, R. Zemp, Low back pain and its relationship with sitting behaviour among sedentary office workers, Appl. Ergon. 81 (2019) 1-8. I. Halim, A.R. Omar, A review on health effects associated with prolonged standing in the industrial workplaces, IJRRAS 8(1) (2011) 14-21. 10.1016/s1050-6411(99)00021-8L. McLean, M. Tingley, R.N. Scott, J. Rickards, Myoelectric signal measurement during prolonged computer terminal work, J. Electromyogr. Kinesiol. 10(1) (2000) 33-45. 10.1177/2165079916630552N.O. Oranye, B. Wallis, K. Roer, G. Archer-Heese, Z. Aguilar, Do personal factors or types of physical tasks predict workplace injury? Workplace Health & Saf. 64(4) (2016) 141-151. 10.1080/00140139.2015.1076528E.H. Woo, P. White, C.W. Lai, Ergonomics standards and guidelines for computer workstation design and the impact on users’ health - a review, Ergon. 59(3) (2016) 464-475. A. Hedge, K. Breeuwsma, Chair design beyond gender and age, Spine 6 (2008) 7. D. Mohamad, B.M. Deros, A.R. Ismail, D.D. Darius, Development of a Malaysian anthropometric database, Conference on Manufacturing Technology and Management, (2010). 10.1016/s1350-4533(00)00086-2M. Lengsfeld, A. Frank, D.L. Van Deursen, P. Griss, Lumbar spine curvature during office chair sitting, Med. Eng. Phys. 22(9) (200) 665-669. 10.1016/s0169-8141(00)00051-2R.S. Goonetilleke, S. Feizhou, A methodology to determine the optimum seat depth, Int. J. Ind. Ergon. 27(4) (2001) 207-217. 10.1016/j.apergo.2008.11.011L. Groenesteijn, P. Liesbeth, Vink, M. De Looze, F. Krause, Effects of differences in office chair controls, seat and backrest angle design in relation to tasks, Appl. Ergon. 40(3) (2009) 362-370. 10.1016/j.ergon.2007.08.019C.R. Mehta, L.P. Gite, S.C. Pharade, J. Majumder, M.M. Pandey, Review of anthropometric considerations for tractor seat design, Int. J. Ind. Ergon. 38(5-6) (2008) 546- 554. 10.1016/j.promfg.2015.07.220R. Alojado, Rosanna, B. Custodio, K.M. Lasala, P.L. Marigomen, Designing an ergonomic chair for pedicurists and manicurists in Quezon City, Philippines, Procedia Manuf. 3 (2015) 1812-1816. 10.1007/s00158-002-0219-xJ. Rasmussen, M. Damsgaard, E. Surma, S.T. Christensen, M.D. Zee, V. Vondrak, Anybody - A software system for ergonomic optimization, Fifth World Congress on Structural and Multidisciplinary Optimization 4 (2003) 6. K. Karuppiah, M.S. Salit, M.Y. Ismail, N. Ismail, S.B. Mohd Tamrin, K. Gobalakrishnan, S. Palanimuthu, T. Palaniandy, Anthropometry of Malaysian young adults, J. Hum. Ergol. 40(1-2) (2011) 37-46. 10.4028/www.scientific.net/aef.10.373N.A.A. Majid, M.F.E. Abdullah, M.S. Jamaludin, M. Notomi, J. Rasmussen, Musculoskeletal analysis of driving fatigue: The influence of seat adjustments, Adv. Electron. Forum. 10 (2013) 373-378.J.E. Fernandez, Ergonomics in the workplace, Facilities 13(4) (1995) 20-27. P. Stephen, Bodyspace: Anthropometry, Ergonomics and the Design of Work, CRC Press, Florida, USA, 2014, pp. 1-352. 10.1016/j.apergo.2019.102894C. Bontrup, W.R. Taylor, M. Fliesser, R. Visscher, G. Tamara, P. Wippert, R. Zemp, Low back pain and its relationship with sitting behaviour among sedentary office workers, Appl. Ergon. 81 (2019) 1-8. I. Halim, A.R. Omar, A review on health effects associated with prolonged standing in the industrial workplaces, IJRRAS 8(1) (2011) 14-21. 10.1016/s1050-6411(99)00021-8L. McLean, M. Tingley, R.N. Scott, J. Rickards, Myoelectric signal measurement during prolonged computer terminal work, J. Electromyogr. Kinesiol. 10(1) (2000) 33-45. 10.1177/2165079916630552N.O. Oranye, B. Wallis, K. Roer, G. Archer-Heese, Z. Aguilar, Do personal factors or types of physical tasks predict workplace injury? Workplace Health & Saf. 64(4) (2016) 141-151. 10.1080/00140139.2015.1076528E.H. Woo, P. White, C.W. Lai, Ergonomics standards and guidelines for computer workstation design and the impact on users’ health - a review, Ergon. 59(3) (2016) 464-475. A. Hedge, K. Breeuwsma, Chair design beyond gender and age, Spine 6 (2008) 7. D. Mohamad, B.M. Deros, A.R. Ismail, D.D. Darius, Development of a Malaysian anthropometric database, Conference on Manufacturing Technology and Management, (2010). 10.1016/s1350-4533(00)00086-2M. Lengsfeld, A. Frank, D.L. Van Deursen, P. Griss, Lumbar spine curvature during office chair sitting, Med. Eng. Phys. 22(9) (200) 665-669. 10.1016/s0169-8141(00)00051-2R.S. Goonetilleke, S. Feizhou, A methodology to determine the optimum seat depth, Int. J. Ind. Ergon. 27(4) (2001) 207-217. 10.1016/j.apergo.2008.11.011L. Groenesteijn, P. Liesbeth, Vink, M. De Looze, F. Krause, Effects of differences in office chair controls, seat and backrest angle design in relation to tasks, Appl. Ergon. 40(3) (2009) 362-370. 10.1016/j.ergon.2007.08.019C.R. Mehta, L.P. Gite, S.C. Pharade, J. Majumder, M.M. Pandey, Review of anthropometric considerations for tractor seat design, Int. J. Ind. Ergon. 38(5-6) (2008) 546- 554. 10.1016/j.promfg.2015.07.220R. Alojado, Rosanna, B. Custodio, K.M. Lasala, P.L. Marigomen, Designing an ergonomic chair for pedicurists and manicurists in Quezon City, Philippines, Procedia Manuf. 3 (2015) 1812-1816. 10.1007/s00158-002-0219-xJ. Rasmussen, M. Damsgaard, E. Surma, S.T. Christensen, M.D. Zee, V. Vondrak, Anybody - A software system for ergonomic optimization, Fifth World Congress on Structural and Multidisciplinary Optimization 4 (2003) 6. K. Karuppiah, M.S. Salit, M.Y. Ismail, N. Ismail, S.B. Mohd Tamrin, K. Gobalakrishnan, S. Palanimuthu, T. Palaniandy, Anthropometry of Malaysian young adults, J. Hum. Ergol. 40(1-2) (2011) 37-46. 10.4028/www.scientific.net/aef.10.373N.A.A. Majid, M.F.E. Abdullah, M.S. Jamaludin, M. Notomi, J. Rasmussen, Musculoskeletal analysis of driving fatigue: The influence of seat adjustments, Adv. Electron. Forum. 10 (2013) 373-378.