Advanced SearchSearch Tips
Development of Tilting Chair for Maintaining Working Position at Reclined Posture
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Development of Tilting Chair for Maintaining Working Position at Reclined Posture
Hyeong, Joon-Ho; Roh, Jong-Ryun; Park, Seong-Bin; Kim, Sayup; Chung, Kyung-Ryul;
  PDF(new window)
Objective: The aim of this study is to develop an office chair enabling to keep working at reclined sitting posture. Background: Sedentary workers are supposed to change the posture frequently during long hours of sitting. A reclined sitting position has been recommended to reduce disc pressure. But slumped sitting posture caused by the buttock sliding forward without any adjustment of back reclining is commonly observed. The worker seems to have tendency to change the sitting posture maintaining working condition. We assumed the reason to be their hands movement away from the working space when tilting backward. Method: Slide mechanism allowing seat to move forward was designed to maintain the hand position in working space during reclining. A prototype was manufactured and tilting motion was analyzed using motion capture system. Four experiment chairs were tested including the manufactured prototype chair and three other commercial chairs. Results: A backward movements of the hand position were 13.0mm, 101.7mm, 156.1mm and 139.3mm at the prototype chair, compared to chair B, chair C and chair D, respectively. And the movement was remarkably small at the prototype chair. Conclusion: The developed seat sliding chair allows back tilting maintaining hand position at working space. We expect the user tilting back more often than normal tilting chair during seated work. But further investigation is required to figure out the effectiveness of the developed chair using prolonged working hours. Application: The developed office chair directly affects commercialization.
Office chair;Tilt mechanism;Maintaining working position;Slide seat;Motion analysis;
 Cited by
Andersson, B.J., Ortengren, R., Nachemson, A. and Elfstrom, G., Lumbar disc pressure and myoelectric back muscle activity during sitting. I. Studies on an experimental chair, Scand J Rehabil Med, 6(3), 104-14, 1974.

Chung, K.R., Hyeong, J.H., Choi, C.H., Kim, S.Y. and Hong, G.S., The Effects of Different Backrest Pivot Positions on the Human Body During Reclining of the Office Chair, KSME(A), 34(2), 167-174, 2010.

Corlett, E.N., Are you sitting comfortably?, International Journal of Industrial Ergonomics, 24(1), 7-12, 1999. crossref(new window)

Dankaerts, W., O'Sullivan, P.B., Burnett, A.F. and Straker, L.M., Differences in sitting postures are associated with non-specific chronic low back pain disorders when sub-classified. Spine, 31(6), 698-704, 2006. crossref(new window)

Ellegast, R.P., Kraft, K., Groenesteijn, L., Krause, F., Berger, H. and Vink, P., Comparison of four specific dynamic office chairs with a conventional office chair: Impact upon muscle activation, physical activity and posture, Applied Ergonomics, 43(2), 296-307, 2012. crossref(new window)

Goroh Fujimaki and Reiko Mitsuya, Study of the seated posture for VDT work, Displays, 23, 17-24, 2002. crossref(new window)

Grandjean, E. and Hunting, W., Ergonomics of posture-review of various problems of standing and sitting posture, Applied Ergonomics, 8(3), 135-140, 1997.

Groenesteijn, L., Vink, P., de Looze, M. and Krause, F., Effects of Differences in office chair controls, seat and backrest angle design in relation to tasks, Applied Ergonomics, 40(3), 362-370, 2009. crossref(new window)

Huang, H.C., Yeh, C.H., Chen, C.M., Lin, Y.S. and Chung, K.C., Sliding and pressure evaluation on conventional and V-shaped seats of reclining wheelchairs for stroke patients with flaccid hemiplegia: a crossover trial, Journal of Neuro Engineering and Rehabilitation, 8(40), 2011. doi: 10.1186/1743-0003-8-40. crossref(new window)

Kieran O'Sullivan, Peter O'Sullivan, Mary O'Keeffe and Leonard O'Sullivan, Wim Dankaerts, The effect of dynamic sitting on trunk muscle activation: A systematic review, Applied Ergonomics, 44(4), 628-635, 2013. crossref(new window)

Lengsfeld, M., Franka, A., Deursenb, D.L. and Grissa, P., Lumbar Spine Curvature During Office Chair Sitting, Medical Engineering & Physics, 22(9), 665-669, 2000. crossref(new window)

Lin, F., Parthasarathy, S., Taylor, S.J., Pucci, D., Hendrix, R.W. and Makhsous, M., Effect of different sitting postures on lung capacity, expiratory flow, and lumbar lordosis, Arch Phys Med Rehabil, 87(4), 504-509, 2006. crossref(new window)

Menendez, C.C., Amick, B.C., Robertson, M., Bazzani, L., DeRango, K., Rooney, T. and Moore, A., A replicated field intervention study evaluating the impact of a highly adjustable chair and office ergonomics training on visual symptoms, Applied Ergonomics, 43(4), 639-644, 2012. crossref(new window)

Peter Opsvik, Rethinking Sitting, W.W. Norton & Company, 2009.

Rani Lueder, Ergonomics of seated movement a review of the scientific literature, Ergonomics review of Humanics Ergosystems, Inc, 2004.

Reenalda, J., van Geffen, P., Snoek, G., Jannink, M., Ijzerman, M. and Rietman, H., Effects of dynamic sitting interventions on tissue oxygenation in individuals with spinal cord disorders, Spinal Cord, 48(4), 336-341, 2010. crossref(new window)

Schultz, A., Andersson, G., Ortengren, R., Haderspeck, K. and Nachemson, A., Loads on the lumbar spine. Validation of a biomechanical analysis by measurements of intradiscal pressures and myoelectric signals, J Bone Joint Surg Am, 64(5), 713-720, 1982.

Vergara, M. and Page, A., Relationship between comfort and back posture and mobility in sitting-posture. Appl. Ergon. 33(1), 1-8, 2002. crossref(new window)

Vos, G.A., Congleton, J.J., Moore, J.S., Amendola, A.A. and Ringer, L., Postural versus chair design impacts upon interface pressure, Applied Ergonomics, 37(5), 619-628, 2006. crossref(new window)