Journal articles: 'Office chair'

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Burri, George J., Sara J. Czaja, Colin G. Drury, and Martin G. Helander. "A Field Evaluation of Office Chairs." Proceedings of the Human Factors Society Annual Meeting 31, no. 10 (September 1987): 1121–22. http://dx.doi.org/10.1177/154193128703101010.

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Ten ergonomic office chairs, chosen from a sample of eighty-four, were evaluated in an ergonomic field study. Twenty office employees used each of the chairs for one day. The chairs were evaluated using four different methods: a chair feature evaluation checklist, a ranking procedure, general comfort and body part discomfort ratings. The first two methods produced positive results, including significant differences between the chairs. The chair users generally had difficulties in perceiving and expressing their comfort and discomfort associated with the latter two methods. The study identified several distinct features related to chair comfort, including the design of the seat pan, back rest, arm rests and ease of adjustability.

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Hu, Jiao, Qing Yin, and Canqun He. "Design of female white-collar office chair based on ergonomics." E3S Web of Conferences 179 (2020): 02101. http://dx.doi.org/10.1051/e3sconf/202017902101.

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In the daily work of office workers, the comfort of the office chair has a great impact on the staff’s work efficiency and human health. Sitting on the office chair for a long time may cause diseases such as cervical, shoulder, and lumbar spine. This article uses online literature research, brand analysis, and offline field research to understand the current status and deficiencies of office chairs, find design points and design directions, and based on ergonomics and sitting analysis research, design general office chairs for female white-collar workers to achieve a comfortable and healthy office purpose.

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Nüesch, Corina, Jan-Niklas Kreppke, Annegret Mündermann, and Lars Donath. "Effects of a Dynamic Chair on Chair Seat Motion and Trunk Muscle Activity during Office Tasks and Task Transitions." International Journal of Environmental Research and Public Health 15, no. 12 (December 3, 2018): 2723. http://dx.doi.org/10.3390/ijerph15122723.

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Employing dynamic office chairs might increase the physical (micro-) activity during prolonged office sitting. We investigated whether a dynamic BioSwing® chair increases chair sway and alters trunk muscle activation. Twenty-six healthy young adults performed four office tasks (reading, calling, typing, hand writing) and transitions between these tasks while sitting on a dynamic and on a static office chair. For all task-transitions, chair sway was higher in the dynamic condition (p < 0.05). Muscle activation changes were small with lower mean activity of the left obliquus internus during hand writing (p = 0.07), lower mean activity of the right erector spinae during the task-transition calling to hand writing (p = 0.036), and higher mean activity of the left erector spinae during the task-transition reading to calling (p = 0.07) on the dynamic chair. These results indicate that an increased BioSwing® chair sway only selectively alters trunk muscle activation. Adjustments of chair properties (i.e., swinging elements, foot positioning) are recommended.

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Kumar Gaur, Davinder, Savita Tamaria, Sumit Kalra, and Nidhi Kalra. "Chair Stretch Technique for Hamstring Flexibility in Office Workers." Physiotherapy and Occupational Therapy Journal 9, no. 3 (2016): 89–93. http://dx.doi.org/10.21088/potj.0974.5777.9316.2.

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Vlaović, Zoran, Danijela Domljan, Ivica Župčić, and Ivica Grbac. "Evaluation of Office Chair Comfort." Drvna industrija 67, no. 2 (2016): 171–76. http://dx.doi.org/10.5552/drind.2016.1615.

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Nadzira, Annisa Ayu, Bagus Juliyanto, and Ahmad Kamsyakawuni. "MODELISASI KURSI DENGAN PENGGABUNGAN HASIL DEFORMASI BENDA-BENDA RUANG MENGGUNAKAN KURVA BEZIER." Majalah Ilmiah Matematika dan Statistika 21, no. 2 (September 23, 2021): 107. http://dx.doi.org/10.19184/mims.v21i2.20733.

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Chairs are needed by humans to do some work, especially students and office workers. The parts contained in the chair are the chair legs, chair legs eats and chair backs. The purpose of this study is to obtain variations in the shape of office chairs using Bezier curves and incorporate the results of deformation of space geometric objects. In modeling this chair, it is divided into several stages, namely first, building the chair leg components. This chair leg component consists of chair wheels, connecting two wheels with tube deformation, modeling the chair leg branch components and modeling chair leg supports. Second, namely the model of the chair leg seat. Chair leg seat consists of regular hexagon prism deformation and regular quadrangle prism deformation. The third is the modelization of the back of the chair by using a rectangular prism model. The result of combining several components of the chair using one modeling axis produces 36 chair models, with special provisions, namely that the seat support parts can only be joined using a tube.

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Vink, P., R. Porcar-Seder, Álvaro Page de Pozo, and F. Krause. "Office chairs are often not adjusted by end-users." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 51, no. 17 (October 2007): 1015–19. http://dx.doi.org/10.1177/154193120705101704.

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To find out how many office workers adjust their chairs, 350 office workers in Spain and the Netherlands are observed and questioned on whether they adjust their chairs. It appears that 24% of 236 Spanish office workers and 61% of 100 Dutch subjects never adjust their chair. If the chair is adjusted, it concerns mostly the seat height. Except for the seat height, other adjustment possibilities are not used by the majority of the study population. Reasons for not adapting could be awareness, complexity of the control system and expected effects.

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Tang, Zhi Hong, Wen Jin Liu, and Guo Qiang Zhang. "Research on the Key Technology of PDM Applied to Office Chair Manufacturer." Applied Mechanics and Materials 532 (February 2014): 629–33. http://dx.doi.org/10.4028/www.scientific.net/amm.532.629.

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To propose technical difficulties of PDM applied in China office chair industry, and puts forward a solution for the coding problem: first presents a PDM-based classification method of office chair products and parts; Constructed the Office Chair Product Information Tree and base on it established Office Chair Enterprise Information Coding System framework; Base on the classification method and reference the relevant standards, introduce the Tabular Layouts of Article Characteristic, the office chair coding scheme is developed. The coding technology has been verified by applying on Kingdee WISE K/3 PLM system. For the problem of office chair non-digital product data digitization, puts forward the Office Chair Template Data Acquisition & Output Technology, to digitalise the non-digital data for facilitating the PDM system to manage, share to CAM equipment. The technology has been successfully applying to Landmega Furniture Co., Ltd.

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Dun, Xiaorong, and Yeying Liu. "Study on Design of Female Office Chair Based on Ergonomics." E3S Web of Conferences 179 (2020): 02073. http://dx.doi.org/10.1051/e3sconf/202017902073.

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In view of the fact that existing office chairs cannot fully meet the needs of office workers, especially the design of some adjustable parts, there is a lack of consideration for female size, body structure, and psychological needs. In this paper, through online and on-site research, combined with the results of the research, the existing office chairs are analyzed for related human-machine functions, and specific improvements for the chair surface, armrests, backrests, and footrests of female office chairs are proposed. Provide effective suggestions for improving the ergonomic design of female office chairs and determining design elements.

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Yang, Hai Bo, Shu Guang Sang, and Yu Tao Feng. "Health Office Chair Design Based on Ergonomics." Applied Mechanics and Materials 274 (January 2013): 517–22. http://dx.doi.org/10.4028/www.scientific.net/amm.274.517.

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Starting from human design perspective of the product and using ergonomics knowledge, measurement method and model method are adapted to analyze harmonious relations between people in the sedentary state and office chairs in various parts. The research aims at how to correctly apply the theory of ergonomics in the design of new product development to ensure that the technical problems related to design fitness. And for the “Chair family ”--- the sedentary population, the user-friendly design elements of health office chairs, methods and performance evaluation are studied and summarized as well.

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Tang, Zhi Hong, Wen Jin Liu, and Guo Qiang Zhang. "Research of the Office Chair Coding Technology Based on PDM." Applied Mechanics and Materials 496-500 (January 2014): 2888–91. http://dx.doi.org/10.4028/www.scientific.net/amm.496-500.2888.

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To propose technical difficulties of PDM applied in China office chair industry, and puts forward a solution for the coding problem: first presents a PDM-based classification method of office chair products and parts; Constructed the Office Chair Product Information Tree and base on it established Office Chair Enterprise Information Coding System framework; Base on the classification method and reference the relevant standards, introduce the Tabular Layouts of Article Characteristic, the office chair coding scheme is developed. The coding technique has been verified by applying on Kingdee WISE K/3 PLM system.

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Heller- Ono, Alison. "Predictive Analytics for Chair Asset Management." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 64, no. 1 (December 2020): 1223–27. http://dx.doi.org/10.1177/1071181320641291.

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Once an ergonomic office chair is purchased in the workplace, it usually remains in circulation far beyond its acceptable life cycle and warranty. Older chairs present ergonomic and safety risks exposing employees to unnecessary musculoskeletal stress and strain resulting in injury exposure claims for the employer. This paper introduces a chair assessment methodology using predictive analytics to evaluate the quality and competency of an office ergonomic chair over time. Rather than relying solely on an employee’s subjective, biased opinion of chair quality or waiting for absolute failure; instead an objective, measurable rating scale is used to determine chair status. The Chair Assessment (software) System (CAS) provides an overall score indicating whether the chair should remain in use, be repaired or removed from circulation in a timely manner so it can be replaced. The Chair Assessment System is part of a furniture asset management system focused specifically on chair use-life cycle.

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Mantooth, Whitney, Yibo Zhu, and Ranjana K. Mehta. "Ergonomic Evaluation of Office Furniture on Team Dynamics." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 61, no. 1 (September 2017): 1858. http://dx.doi.org/10.1177/1541931213601944.

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Office workers are at high-risk for work-related musculoskeletal disorders (WMSDs), which can inhibit productivity and perceived comfort through associated disorders (Piligian et al, 2000). An increase in WMSDs has created a demand for ergonomic office interventions. Recent ergonomic advancements have focused on dynamic office furniture that aim to promote chairs featuring structural designs (Ellegast et al, 2012). Dynamic office furniture lacking a range of specific and modifiable adjustments can lead to adverse outcomes, such as nerve compression, resulting in perceived discomfort and increased risk of musculoskeletal disorders (Groenesteijn et al, 2009; Legg et al, 2002). However, there is limited research regarding the relationship of posture changes and the effects on perceived comfort and task performance. The objective of the study was to explore the relationship between perceived comfort, productivity, postural changes, and adjustability in chairs with varying degrees of adjustability. The study consisted of 44 participants (54.5% males, 22.8 (2.89) years) attending three different days, working together in teams of 2-3, to complete a 3-hour simulated office task related to construction science. Tasks required team collaboration to evaluate construction bids, develop plan of actions, and present conclusions to each task. To determine the ergonomic impact of office furniture on team creativity and productivity on the design project, two different types of chairs were employed that varied in the level of user involvement for chair adjustments – no involvement without adjustment and high involvement with adjustment, each presented on separate days. Subjective surveys were used at the end of every session to evaluate the chair used in that session that determined individual satisfaction, usability, and perceived discomfort levels. Continuous video obtained during the sessions were analyzed to obtain the number of postural changes (e.g., bending from side to side, shoulders or back ‘drooping’), chair adjustments made, unintended jerks, and chair switches throughout each time period (for a total of 3 time periods) on each day. Performance on the simulated construction science tasks were assessed using a predetermined rubric that included components such as document completion, completed summaries, and presentations to obtain a total performance score. Reported here are preliminary findings from the video analyses and discomfort surveys. A 2-chair x 3-time repeated measures analysis of variance (ANOVA) on postural change over time revealed that postural changes on the chair associated with no involvement without adjustment was higher than that of high involvement with adjustment, however this was only seen in times 1 and 2. This implies that the benefit of adjustments are likely lost over time. Separate one-way ANOVAs were performed on discomfort scores to test the effects of the two chairs. Overall, perceived discomfort across different body regions did not differ between chairs. It is likely that more postural changes were needed to maintain initial comfort levels in the no involvement no adjustment chair studied and were necessary to minimize discomfort. Preliminary findings obtained here will help identify the extent to which postural deviations affect team productivity and responses on discomfort and strain.

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Bridger, R. S., and G. G. Jaros. "Are you really sitting comfortably? A field study of a forward sloping chair and sedentary low back pain sufferers." South African Journal of Physiotherapy 42, no. 3 (August 31, 1986): 85–90. http://dx.doi.org/10.4102/sajp.v46i3.807.

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A number of authors have suggested that office chairs designed to encourage users to sit with an "open" trunk-thigh angle (approximately 110-120 degrees) will be more comfortable than conventional chairs and will have beneficial consequences for sedentary low back pain sufferers.This assertion was investigated in a 4 month trial in which 35 sedentary workers were given a forward sloping chair to use. Ratings of perceived back pain and postural comfort when using the chair were compared with ratings obtained when conventional chairs were used. Additionally, users' comments on both chair types were obtained.For the sample as a whole, significantly less lower back pain was reported on those occasions when the forward sloping chair was used. However, a number of participants reported no change or more back pain when using the forward sloping chair. Users’ comments on the chair highlighted a number of practical advantages and disadvantages which relate to its suitability for use in office settings.Although the majority of users preferred the forward sloping chair to their usual chairs, the available data do not permit the differential response to the chair to be explained on either personal, occupational, anthropometric or ergonomic grounds. A more clinically orientated investigation would seem to be required.

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15

Bridger, R. S., and G. G. Jaros. "Are you really sitting comfortably? A field study of a forward sloping chair and sedentary low back pain sufferers." South African Journal of Physiotherapy 42, no. 3 (August 31, 1986): 85–90. http://dx.doi.org/10.4102/sajp.v42i3.807.

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A number of authors have suggested that office chairs designed to encourage users to sit with an "open" trunk-thigh angle (approximately 110-120 degrees) will be more comfortable than conventional chairs and will have beneficial consequences for sedentary low back pain sufferers.This assertion was investigated in a 4 month trial in which 35 sedentary workers were given a forward sloping chair to use. Ratings of perceived back pain and postural comfort when using the chair were compared with ratings obtained when conventional chairs were used. Additionally, users' comments on both chair types were obtained.For the sample as a whole, significantly less lower back pain was reported on those occasions when the forward sloping chair was used. However, a number of participants reported no change or more back pain when using the forward sloping chair. Users’ comments on the chair highlighted a number of practical advantages and disadvantages which relate to its suitability for use in office settings.Although the majority of users preferred the forward sloping chair to their usual chairs, the available data do not permit the differential response to the chair to be explained on either personal, occupational, anthropometric or ergonomic grounds. A more clinically orientated investigation would seem to be required.

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16

Maradei García, Fernanda, Zuli Galindo Estupiñan, and Javier Castellanos Olarte. "Comfort Testing in Office Chair Design." Revista UIS Ingenierías 16, no. 1 (May 19, 2017): 69–74. http://dx.doi.org/10.18273/revuin.v16n1-2017007.

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Li, Qing Quan, Hai Tao Wu, Hong Bin Liu, and Jie Liu. "Three-Dimensional Modeling Design on Multifunctional Office Chair for Fitness on Solidworks." Advanced Materials Research 655-657 (January 2013): 245–48. http://dx.doi.org/10.4028/www.scientific.net/amr.655-657.245.

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Established the model of multifunctional office chair for fitness, using 3D modeling software Solidworks, finished the 3D model of parts and parts assembly according to the design requirements of multifunctional office chair, visually and efficientlly. Importantly, this chair is the combination of fitness and massage function. So it is practical and cnvenient to the office crowd.

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Hedge, Alan. "What Am I Sitting On? User Knowledge Of Their Chair Controls." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 60, no. 1 (September 2016): 455–59. http://dx.doi.org/10.1177/1541931213601103.

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This study tested user knowledge and the use of the controls for their work chairs for a volunteer sample of 1004 office workers who were randomly selected for survey from 23 different companies and who were sitting on one of a total of 60 different ergonomic office chairs. Results showed that with the exception of seat height and armrest adjustment, only a small minority of users had accurate knowledge about the controls on their chair. Even when users correctly identified a chair control, less than 50% said they had ever used that control. There was no effect of ergonomics chair training on user perceived chair comfort. Those who had received previous training for an ergonomic chair reported less frequent musculoskeletal discomfort than those with no training or with specific training on their current. Users who sat on chairs with 3 or fewer controls reported significantly less frequent musculoskeletal discomfort than those sitting on more complex chairs with 4 or more controls. Overall, the results show that up to two thirds of users knew about their controls for adjusting seat height, seat depth and armrest height, but most users were unaware of controls for other functions. The implications for chair design are discussed.

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Goossens, R. H. M., M. P. Netten, and B. Van der Doelen. "An office chair to influence the sitting behavior of office workers." Work 41 (2012): 2086–88. http://dx.doi.org/10.3233/wor-2012-0435-2086.

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Zhang, Juyong, Aiguo Yin, Guojin Chen, Yongning Li, Zhiping Lu, and Ban Wang. "Research on the Intelligent Design of Office Chair Patterns." Applied Sciences 12, no. 4 (February 18, 2022): 2124. http://dx.doi.org/10.3390/app12042124.

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(1) Background: Personalized product customization is an important direction in the development of the chair industry. This paper studies an intelligent design method for the rapid realization of personalized office chair customization; (2) Methods: based on the case-based reasoning (CBR) method, the characteristic attributes of office chair patterns are analyzed, and an attribute model is established. According to office chair data and customer demand, an intelligent design model using multi-layer weighted k-nearest neighbor (K-NN) for chair patterns is developed using the entropy weight method and an analytic hierarchy process. In addition, an example is employed for verification of the K-NN and multi-layer weighted K-NN retrieval models; (3) Results: both models are able to effectively retrieve chair type cases that meet the target requirements from the office chair pattern base; the case matching similarity of the multi-layer weighted K-NN retrieval model was higher, with an average increase of about 3.9%, and the chair pattern case results obtained by setting different customer needs are different, indicating that the case can be selected according to different customer preferences, which is more conducive to personalized product customization design; (4) Conclusions: The multi-layer weighted K-NN model for intelligent chair pattern design proposed in this paper is more conducive to personalized product customization design.

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ISHIKURA, Hiroyuki, and Nobutoshi YAMAZAKI. "Office Chair Design for Notebook PC Work." Japanese Journal of Ergonomics 49, no. 2 (2013): 54–61. http://dx.doi.org/10.5100/jje.49.54.

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Dayton, Douglas C. "Audio communications module for an office chair." Journal of the Acoustical Society of America 88, no. 6 (December 1990): 2919. http://dx.doi.org/10.1121/1.399573.

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Lengsfeld, M., A. Frank, D. L. van Deursen, and P. Griss. "Lumbar spine curvature during office chair sitting." Medical Engineering & Physics 22, no. 9 (November 2000): 665–69. http://dx.doi.org/10.1016/s1350-4533(00)00086-2.

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Chen, Hao, Hai Yan Song, Jian Guo Zhang, and Fang Wang. "Study on Influence of Back Angle on Human Body Pressure Distribution." Advanced Materials Research 655-657 (January 2013): 2088–92. http://dx.doi.org/10.4028/www.scientific.net/amr.655-657.2088.

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Through the study of the seat size parameter change on the body pressure distribution effect, the powerful references to comfort design of office chair were explored. By using Canadian XSENSOR X3 PRO V6 test system, human body pressure distribution and subjective comfort evaluation in different back angle of 6 objects were tested. The data were processed by statistical analysis software SPSS 16. Then the change of maximum pressure, average pressure, contact area of seat surface and backrest, as well as the vertical pressure distribution curve with the back angle were obtained. Finally the comfort indicators of daily office chair were determined based on body pressure distribution, and the most comfortable back angle of office chair were also solved. Thereby it can provide reference for those who want to design comfortable daily office chair.

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Cao, Chenfei, Yuhong Wei, and Jiawei Tang. "Design of kneeling-sitting dual-use office chair based on ergonomics." E3S Web of Conferences 179 (2020): 02009. http://dx.doi.org/10.1051/e3sconf/202017902009.

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With the popularity of paperless office methods, the proportion of people who use sitting posture as the main office posture is increasing[1], but at the same time, some disadvantages of sitting office are also highlighted. From the perspective of ergonomics, this article designs and analyses the structure and specific dimensions of the kneeling-sitting dual-use office chair. Based on the analysis of human spine curvature and lumbar electromyography, the effects of kneeling and sitting postures on human spine were compared. Then perfect the kneeling-sitting dual-use office chair that is more suitable for people’s office style.

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Ren, Jian Ping, and Yu Gang Ye. "The Design of the Multi Fitness Function Office Chair." Applied Mechanics and Materials 138-139 (November 2011): 618–23. http://dx.doi.org/10.4028/www.scientific.net/amm.138-139.618.

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This paper proposed a design of the office chair with multi fitness function (multi-functional office chair for short) which can mainly achieved comfortably office; adjust the reline angle, doing fitness activities, such as stretched movement, kicking motion, sit-ups and so on. It not only satisfies the needs of people's daily work, rest and fitness exercise, but also meets the design requirements of ergonomics.

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Shanmugam, Ramalingam. "The lengths of spinal curvature stretch due to the angles of sitting on saddle chair to alleviate back pain: A statistical analysis." Work 68, no. 4 (April 27, 2021): 1027–33. http://dx.doi.org/10.3233/wor-213433.

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BACKGROUND: By dividing the burden of one’s weight between the shins and the buttocks in the sitting position on an office or saddle chair, a person can avoid back pain. In this 21st century, sitting on a chair for long hours in workplace on office chair is unavoidable necessity and hence, millions in different countries undergo a risk for backpain. Is there a right sitting position? OBJECTIVE: The aim of this article is to find out how much a correlation exists between the angle of sitting and the length of spinal curvature which is the source of backpain. An experiment can be designed and carried out to measure various angles in sitting and the changing length of the person’s spinal cord curvature. METHOD: The usual statistical methodology requires a pair of values namely x and y to quantify the correlation. The data on sitting angles and the length of spinal curvature do not have such pairing, and hence, the traditional approach to find the correlation between the sitting angle and length of spinal curvature is not applicable. Yet, an approach is necessary. This article constructs an innovative statistical approach to fulfil this need. RESULTS: Our approach yields a correlation of 0.998 for sitting on office chair and an increased correlation of 0.999 on saddle chair, according to the Truszczyńska-Baszaka et al.’s data. CONCLUSIONS: An adjustment is made in various angles of sitting on office chair to transform the comfortable sitting on a saddle chair. In consequence, the proportional effect on the spinal curvature is estimable with the data and it is phenomenal (that is significantly more than one). No wonder people prefer saddle chair over office chair when it comes to avoid back pain and this article proves the convenience statistically.

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Jiang, Bo, Hai Tao Wu, Hong Bin Liu, and Hai Tao Liu. "Buffer Analysis of Multifunction Office Chair Based on ADAMS and ANSYS." Advanced Materials Research 655-657 (January 2013): 249–52. http://dx.doi.org/10.4028/www.scientific.net/amr.655-657.249.

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The 3D model of a multi-functional office chair is completed by SolidWorks and imported into ADAMS. On this basis, we establish damping rubber model by ANSYS and import it into ADAMS through the interface between ADAMS and ANSYS. In this way, the damping rubber is added to dynamics simulation of the chair. The simulation results show that the damping rubber model established by ANSYS can bring perfect damping effects between the gear and base when the rubber is used in the chair. The results also show that the design of the multi-functional office chair can fully meet the requirements.

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Yang, Hai Bo, and Yu Tao Feng. "Design & Research of People-Oriented Office Chair." Advanced Materials Research 591-593 (November 2012): 236–40. http://dx.doi.org/10.4028/www.scientific.net/amr.591-593.236.

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Measurement method and model method are adapted to analyze harmonious relations between people in the sedentary state and office chairs in various parts by starting from human design perspective of the product and using ergonomics knowledge. The research aims to settle down the technical problems which related to design fitness by correctly applying the ergonomics theory. During design process should study and summarize the user-friendly design elements of health office chairs, methods and performance evaluation as well.

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Jung, Suk G., and Sang D. Lee. "Recommended Dimension of Office Chair Design for Korean." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 44, no. 29 (July 2000): 296–99. http://dx.doi.org/10.1177/154193120004402978.

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Legg, S. J., H. W. Mackie, and W. Milicich. "Evaluation of a prototype multi-posture office chair." Ergonomics 45, no. 2 (February 1, 2002): 153–63. http://dx.doi.org/10.1080/00140130110120042.

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Sujbert, László, and Attila Szarvas. "Noise-Canceling Office Chair with Multiple Reference Microphones." Applied Sciences 8, no. 9 (September 19, 2018): 1702. http://dx.doi.org/10.3390/app8091702.

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Office employees are exposed to acoustic noise, especially in an open office environment. Passive or active headsets sufficiently reduce the level of noise, but their long-time wear is uncomfortable. The paper presents an active headrest system built into a chair. Feedforward control is utilized with multiple reference microphones, and flexible gooseneck microphones serve as error sensors. The reference sensors surround the chair, allowing the suppression of sound waves arriving from any direction. The concept of multiple reference control has been tested by extensive experiments showing that multiple reference signals help to increase the suppression in normal rooms where reverberation occurs, even if only one noise source is present. The preliminary experiments are completed by a series of simulations aiming to explore the zones of quiet at the user’s ears. The paper introduces the construction details of the noise-canceling chair: The two loudspeakers are controlled by the signals of two error microphones and four reference signals. The controller is based on the normalized filtered error least mean squared algorithm, implemented on an Analog Devices ADSP-21262 signal processor-based hardware. Experimental results are reported that show the efficient suppression of tonal, as well as broadband disturbances.

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Baumgartner, Daniel, Roland Zemp, Renate List, Mirjam Stoop, Jaroslav Naxera, Jean Pierre Elsig, and Silvio Lorenzetti. "The Spinal Curvature of Three Different Sitting Positions Analysed in an Open MRI Scanner." Scientific World Journal 2012 (2012): 1–7. http://dx.doi.org/10.1100/2012/184016.

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Sitting is the most frequently performed posture of everyday life. Biomechanical interactions with office chairs have therefore a long-term effect on our musculoskeletal system and ultimately on our health and wellbeing. This paper highlights the kinematic effect of office chairs on the spinal column and its single segments. Novel chair concepts with multiple degrees of freedom provide enhanced spinal mobility. The angular changes of the spinal column in the sagittal plane in three different sitting positions (forward inclined, reclined, and upright) for six healthy subjects (aged 23 to 45 years) were determined using an open magnetic resonance imaging (MRI) scanner. An MRI-compatible and commercially available office chair was adapted for use in the scanner. The midpoint coordinates of the vertebral bodies, the wedge angles of the intervertebral discs, and the lumbar lordotic angle were analysed. The mean lordotic angles were16.0±8.5∘(mean ± standard deviation) in a forward inclined position,24.7±8.3∘in an upright position, and28.7±8.1∘in a reclined position. All segments from T10-T11 to L5-S1 were involved in movement during positional changes, whereas the range of motion in the lower lumbar segments was increased in comparison to the upper segments.

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Kahya, Emin. "Assessment of musculoskeletal disorders among employees working office workplaces in the manufacturing sector." Work 69, no. 3 (July 16, 2021): 1103–13. http://dx.doi.org/10.3233/wor-213539.

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BACKGROUND: The number of studies investigating the relationship between office employees and the development of musculoskeletal disorders (MSDs) is limited. Only a few focused on assessing workplace ergonomics of office employees. OBJECTIVE: This study aims to investigate the risk of MSDs and associated factors in the office workplaces of a large-size manufacturing company. METHODS: Data were gathered from 208 office employees from a manufacturing company via Rapid Office Strain Assessment (ROSA) and Cornell questionnaire. The collected data were analyzed to examine the relationship between ergonomic risk levels and MSDs reported by the office staff. RESULTS: The mean ROSA final score is 3.52 (std. dev. = 0.71), chair section is 3.30, monitor and telephone section is 2.18, and mouse and keyboard section is 2.69. Thirty-nine of 208 (18.8%) office workplaces are at risk. The most important factor to raise the risk level is found to be the height and depth of the chair. The Cornell questionnaire results highlight that the highest discomfort severity is related to the neck (32.26%), lower back (23.23%) and upper back (22.26%). The discomforts in the neck (r = 0.362), upper back (r = 0.404) and lower back (r = 0.368) are moderately and positively correlated according to the final ROSA score. The results indicate that the highest risked departments are Accounting, Sub Industry, Production Planning, and Manufacturing Management. CONCLUSION: The parameters associated with the chair section should be considered a priority for reducing and eliminating MSDs among office employees.

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Xu, Ji Feng, Han Ning Zhang, and Zi Chao Nie. "Office Chair Design Methods Based on Dynamic Sitting Behavior." Applied Mechanics and Materials 610 (August 2014): 111–16. http://dx.doi.org/10.4028/www.scientific.net/amm.610.111.

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Human sitting posture and dynamic behavior at work are analyzed systematically by using the principle and method of ergonomics. And from the scales and functionality limited by both aspects, put forward new design ideas of office chair which are fit to modern office work so as to provide reference to design practice.

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Hedge, Alan, and William A. Erickson. "Office Environment Syndrome Study: Part II." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 42, no. 8 (October 1998): 639–42. http://dx.doi.org/10.1177/154193129804200804.

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A longitudinal self-report diary study of SBS cases and controls identified from buildingwide surveys of 4 office buildings is described. Self-report diaries were distributed to a total of 214 workers in the 4 buildings, and complete returns were obtained for 123 workers (57% return rate). Climate conditions (CO, CO2, formaldehyde, respirable dust mass (PM3.5) and particulate counts (0.3 μm, 0.5 μm, 1 μm, 5 μm), settled dust, air temperature, %RH, illuminance) were measured at each workstation. Ergonomic factors (observed work posture, office type, desk paper coverage, desk clutter, computer, mouse, keyboard tray, age of chair, chair arms, and plants, were measured at each workstation. Results showed no differences in prevailing climate conditions measured at case/control workstations. However, case reports of symptoms and environment conditions generally were worse than those for controls, and these reports showed periodicity, peaking late each day. The differences between reports by cases and controls generally remained consistent throughout the duration of the study.

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Li, Xing Yu, and Li Li Liu. "Design of Multi-Function Fashion Chair Based on Human Factors Engineering." Applied Mechanics and Materials 851 (August 2016): 884–87. http://dx.doi.org/10.4028/www.scientific.net/amm.851.884.

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Based on the current status of the development of the chair on the market, taking human engineering research as the starting point of design, existing defects and problems of existing chairs as a starting point, so as to design a multifunctional fashion chair. It not only has the function of chairs, but also increases the function of modern subsidiary, make it better and more convenient to be used by modern people. So which not only improves the comfort of the chair and more humane. Chinese Economic Reform, china's national economy has been developing fast, people's living standard has been gradually improved. Now people are longing for a better life, this is also evident in the choice of daily furniture and requirements. In this paper, the existing problems in the use of chairs are investigated and analyzed. We redesign chairs with the concept of practicability and functionality, research the structure of the chair to expand the function of chairs. When it is placed in the home or office, it will has lots of application and is easy to be used.

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Zhang, Xuyinglong, Zilian Cheng, Mengyang Zhang, Xiaodong Zhu, and Xianquan Zhang. "Comfort Prediction of Office Chair Surface Material Based on the ISSA-LSSVM." Sensors 22, no. 24 (December 14, 2022): 9822. http://dx.doi.org/10.3390/s22249822.

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This study serves the purpose of assisting users in selecting a comfortable seat surface material for office chairs and enhancing users’ comfort while using office chairs. To address the issue that the selection of traditional seat surface material is too subjective and that the prediction effect is poor, an improved sparrow search algorithm (ISSA) optimized least squares support vector machine (LSSVM) method for office chair seat surface material comfort prediction has been proposed. Sparrow Search Algorithm (SSA) was optimized with Sobol sequences, nonlinear inertial weights, and a crisscross optimization algorithm to produce the Improved Sparrow Search Algorithm (ISSA), and then the relevant parameters of the LSSVM algorithm were optimized with the modified algorithm to improve its prediction performance. The prediction accuracy of the ISSA-LSSVM model is as high as 95.75% by combining the body pressure distribution experiments; the root mean square error (RMSE) is 0.29; the goodness of fit (R2) is 0.92; the mean absolute error (MAE) is 0.24; the standard deviation (RSD) is 5.99%. The ISSA-LSSVM model predicts seat surface material comfort more accurately and reliably. This strategy can assist consumers to narrow down their seat surface material choices and even suggest an optimal selection. In this way, it can boost users’ pleasure with office chairs, which has great potential for wide application.

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Koyama, Jun, Yusuke Doi, Masanari Ukai, and Tatsuo Nobe. "Study on Cool Chair equipped with warming function." E3S Web of Conferences 111 (2019): 02033. http://dx.doi.org/10.1051/e3sconf/201911102033.

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Recent air-conditioning systems aim to provide thermal comfort for an unspecified number of residents. However, office workers may perceive the feeling of comfort differently depending on their clothing, metabolic rate, and personal activity level. This may cause difficulties in maintaining an optimal thermal environment. To address this problem, personal air-conditioning has attracted attention, which is highly versatile and can reduce thermal discomfort and provide comfort to all office workers by enabling individual thermal control. Therefore, the authors focused on developing an office chair, the “Cool Chair”, as a chair-type personal air-conditioning system with a cooling function from 2003 to 2016. The authors then added a warming function for year-round operation, creating the “Cool Chair with Warming Function” in 2017. Subjective evaluation results are reported. These experiments using the new chair indicated that the warming function achieves steady state in 30 minutes and the equivalent temperature of the entire body increases by +2°C. In subject experiments, the warming and cooling functions were adjusted according to individual preferences, and the cooling function was used even during winter by some individuals. The authors also confirmed that the feeling of comfort by the subjects improved at both 19°C and 22°C.

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Beaton, Robert J. "Reliability Evaluation of the BIFMA Chair Measurement Device." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 42, no. 12 (October 1998): 866–70. http://dx.doi.org/10.1177/154193129804201206.

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This paper reports an evaluation of the reliability of the Business and Institutional Furniture Manufacturers Association's (BIFMA) chair measurement device (CMD) for assessing design specifications. Eight participants were trained to use the CMD to measure three typical office chairs. The variations in measurements obtained across participants, across chairs, and across the various chair design specifications were examined statistically. The standard deviations and confidence intervals for the measurements were used to evaluate inter-evaluator reliability (consistency across the different evaluators) and intra-evaluator reliability (consistency within an evaluator). The observed measurement errors were relatively small, indicating that CMD measurements can be made reliable across evaluators, as well as repeatedly by evaluators.

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Armandroff, Olivia. "A Dentist’s Chair: For Practicality, Comfort, or Spectacle?" Journal of Design History 34, no. 2 (April 5, 2021): 89–100. http://dx.doi.org/10.1093/jdh/epab005.

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Abstract This essay focuses on a thirteen-inch-high reclining chair with a carved walnut frame, brass base, and emerald green velvet upholstery in the Winterthur Museum collection [1 and 2]. Created by Ira Salmon of Boston circa 1866, the chair is a patent model and part of Salmon’s efforts to win a professional reputation as a dentist early in his career. This essay documents the transformation of dentistry in America from an itinerant practice in the early republic to a professionalized career in the mid-nineteenth century. It offers evidence of how the material world of dentists changed when tools of the profession became standardized and mass produced. Developing technologies facilitated reclining chairs suited for newfangled operative techniques. The essay also focuses on a period that anticipates the development of germ theory in the early twentieth century and the sterilization of the dentist’s office. In this mid-nineteenth century moment, the aesthetics of dentist offices, and their chairs’ designs, bridge a divide between the traditional values associated with dentists and those ascribed to dentists today. The patent model demonstrates Salmon’s desire to appeal to his clients’ interest by capturing the dramatic potential of a dentist’s visit while satisfying their desire for comfort and expectation of skilful technique.

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Riener, Andreas. "Display Content Adaptation Using a Force Sensitive Office Chair." International Journal of Ambient Computing and Intelligence 3, no. 3 (July 2011): 8–17. http://dx.doi.org/10.4018/jaci.2011070102.

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In this paper, the author introduces a novel method for non-invasive, implicit human-computer interaction based on dynamically evaluated sitting postures. The research question addressed is whether or not the proposed system is able to allow for non-obtrusive screen content adaptation in a reading situation. To this end, the author has integrated force sensor array mats into a traditional office chair, providing sitting postures/gestures of the person seated in real time. In detail, variations in the center of pressure were used for application control, starting more generally with usability assessment of cursor control, breaking them down to simple(r) pan and zoom of screen content. Preliminary studies have indicated that such a system cannot get close to the performance/accuracy of keyboard or mouse, however its general usability, e.g., for handicapped persons or for less dynamic screen content adaptation, has been demonstrated and some future potential has been recognized.

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Mahaptra, S. S., and Pragyan Paramita Mohanty. "Design of Office Chair: A Quality Function Deployment Approach." International Journal of Advanced Materials Manufacturing and Characterization 3, no. 1 (March 13, 2013): 131–35. http://dx.doi.org/10.11127/ijammc.2013.02.023.

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Fewster, Kayla M., Graham Mayberry, and Jack P. Callaghan. "Office Chair Backrest Height Affects Physiological Responses to Sitting." IISE Transactions on Occupational Ergonomics and Human Factors 8, no. 1 (January 2, 2020): 50–59. http://dx.doi.org/10.1080/24725838.2020.1745956.

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Yuan, Fangcheng, Yong Guo, Yunjiao Shi, Kaiting Zhang, Zhenzhen Zhu, and Yuxia Chen. "A novel bamboo sheet chair and its influence on sitting comfort." PeerJ 8 (July 1, 2020): e9476. http://dx.doi.org/10.7717/peerj.9476.

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Background In today’s economy, workers spend increasingly more time in seated positions, leading to a growing scientific interest in chair design. In this study we used body pressure distribution tests to compare a novel bamboo chair with unique structural features to other commonly-used chairs. We studied the bamboo sheet chair’s physical characteristics and comfort to provide a scientific theoretical basis for common use seat design. Methods A total of 25 (14 male and 11 female) subjects participated in the study. Subjects were divided into six groups according to their body characteristics parameters included stature, weight, shoulder breadth, hip breadth, waist width, popliteal height, buttocks-popliteal length, and buttock-abdomen depth, with three groups for males and three groups for females. Each subject was required to complete specified body pressure tests for three different experimental chairs for three minutes and subjective comfort evaluations were also administered. The pressure indexes were measured from the seat pan and backrest and calculated with MATLAB 2015b, which mainly included maximum pressure (Pm), average pressure (Pa), pressure exponent (Pe) and contact area index (PAI). Three pressure threshold limits of 0.67 kPa, 4.00 kPa and 9.33 kPa and four contact surface indexes were used in the experiment to reflect the contact area between human and chair. Results The contact areas in the backrest (52.96 ± 32.94 cm2) and seat pan (307.75 ± 90.31 cm2) in the middle-to-high threshold pressure range, and the contact areas of the backrest (4.34 ± 5.95 cm2) in the high threshold pressure range of bamboo sheet chair were smaller than the corresponding indexes of the common office chair (81.430 ± 45.04 cm2, p = 0.00; 394.39 ± 98.99 cm2, p = 0.02; 13.54 ± 12.00 cm2, p = 0.00, respectively). The pressure index (2.68 ± 0.88 kPa), maximum pressure (6.66 ± 2.05 kPa), and average pressure (2.42 ± 0.59 kPa) values of the bamboo sheet chair backrest were also found to be lower than those of the office chair (4.32 ± 1.62 kPa, p = 0.00; 10.50 ± 3.88 kPa, p = 0.00; 3.43 ± 0.97 kPa, p = 0.00, respectively). The average pressure on the seat pan was greater than 4 kPa for all subjects, while the average pressure on the seat pan was greater than 9.33 kPa for male subjects with a body mass index (BMI) of 27.48. Discussion The bamboo sheet chair’s contact areas within the middle-to-high and high-pressure threshold ranges of the backrest and seat pan were smaller than those of the office chair, indicating that the bamboo sheet chair is effective at relieving pressure. Human body characteristics must be considered in the design of seat functional size. Buttocks-popliteal length, weight, body mass index, body shape and weight distribution, all have important effects on the distribution of body pressure at the human-chair interface.

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Black, Nancy L., and Samuelle St-Onge. "Measuring pandemic home-work conditions to determine ergonomic recommendation relevance." Work 71, no. 2 (February 18, 2022): 299–308. http://dx.doi.org/10.3233/wor-210726.

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BACKGROUND: Computer-intensive office work associations with health challenges may intensify following COVID-19 pandemic-related changes to home-based office work. OBJECTIVE: To determine working conditions, perception and physical elements affecting health after pivoting to full time home-work. METHODS: An online questionnaire addressed physical, productivity, motivation, and work-practice factors. Photos of the worker in their home-work environment showed side and front-back perspectives. RESULTS: Sixteen questionnaires were received, and 12 respondents supplied photos. Home and office workplace differences varied. Ten felt productivity was affected, most often positively. Four noted increased pain or fatigue intensity, particularly in the eyes, neck / head, lower back, and shoulders. Working posture was not optimal; six didn’t use traditional chair-sitting for up to half the day. Forward and backward trunk inclination accounted for at least 10% of the workday for 12 respondents; lateral inclination affected ten and eight had unsupported legs. Fifteen used an adjustable chair, but photos revealed ergonomic recommendations were not consistently followed. Fourteen participants communicated regularly by telephone, eight only for moderate duration and ten using adapted telephone equipment. Half of the ROSA scores were high. CONCLUSIONS: Workers forced into telework during the pandemic experience positive and negative impacts. Postures vary more than in offices, potentially increasing health risk.

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Ellegast, Rolf P., Kathrin Kraft, Liesbeth Groenesteijn, Frank Krause, Helmut Berger, and Peter Vink. "Comparison of four specific dynamic office chairs with a conventional office chair: Impact upon muscle activation, physical activity and posture." Applied Ergonomics 43, no. 2 (March 2012): 296–307. http://dx.doi.org/10.1016/j.apergo.2011.06.005.

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Ko, Ya-Chuan, Chi-Hung Lo, and Chi-Chuan Chen. "Influence of Personality Traits on Consumer Preferences: The Case of Office Chair Selection by Attractiveness." Sustainability 10, no. 11 (November 13, 2018): 4183. http://dx.doi.org/10.3390/su10114183.

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With increasing living standards, a modern product is required to provide emotional links between a user’s personality and their work environment, in addition to satisfying functional and physiological needs. Since office workers in Taiwan have average daily working hours of over 8 h, they spend lots of time on office chairs, and nowadays more companies are willing to buy good chairs so that their employees can deliver higher efficiency under a more comfortable office environment. After interviewing a group of experts, office chairs are classified into 7 types, and the participants’ personality traits are classified into 4 categories. The influence of different personality traits on the evaluation of office chairs by attractiveness is analyzed by quantification theory type I. Design elements that can better deliver an office chair’s attractiveness are determined. The results allow future designers to improve their designs by identifying the preferences of target users under difference office scenarios.

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Kuster, Roman Peter, Christoph Michael Bauer, and Daniel Baumgartner. "Is active sitting on a dynamic office chair controlled by the trunk muscles?" PLOS ONE 15, no. 11 (November 30, 2020): e0242854. http://dx.doi.org/10.1371/journal.pone.0242854.

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Today’s office chairs are not known to promote active sitting or to activate the lumbar trunk muscles, both of which functions are ergonomically recommended. This study investigated a newly developed dynamic office chair with a moveable seat, specifically designed to promote trunk muscle controlled active sitting. The study aimed to determine the means by which the seat movement was controlled during active sitting. This was accomplished by quantifying trunk and thigh muscular activity and body kinematics. Additionally, the effect of increased spinal motion on muscular activity and body kinematics was analysed. Ten subjects were equipped with reflective body markers and surface electromyography on three lumbar back muscles (multifidus, iliocostalis, longissimus) and two thigh muscles (vastus lateralis and medialis). Subjects performed a reading task during static and active sitting in spontaneous and maximum ranges of motion in a simulated office laboratory setting. The temporal muscle activation pattern, average muscle activity and body segment kinematics were analysed and compared using Friedman and post-hoc Wilcoxon tests (p≤0.05). Active sitting on the new chair significantly affected the lumbar trunk muscles, with characteristic cyclic unloading/loading in response to the seat movement. Neither thigh muscle activity nor lateral body weight shift were substantially affected by active sitting. When participants increased their range of motion, the lumbar back muscles were activated for longer and relaxation times were shorter. The characteristic activity pattern of the lumbar trunk muscles was shown to be the most likely dominant factor in controlling seat movement during active sitting. Consequently, the new chair may have a potential positive impact on back health during prolonged sitting. Further studies are necessary to analyse the frequency and intensity of active sitting during daily office work.

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Vlaović, Zoran, Marko Jaković, and Danijela Domljan. "Smart Office Chairs with Sensors for Detecting Sitting Positions and Sitting Habits." Drvna industrija 73, no. 2 (May 31, 2022): 227–43. http://dx.doi.org/10.5552/drvind.2022.0002.

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The health consequences of prolonged sitting in the office and other work chairs have recently been tried to be alleviated or prevented by the application of modern technologies. Smart technologies and sensors are installed in different parts of office chairs, which enables monitoring of seating patterns and prevents positions that potentially endanger the health of users. The aim of this paper is to provide an overview of previous research in the field of the application of smart technologies and sensors built into office and other types of chairs in order to prevent diseases. The articles published in the period 2010-2020 and indexed in WoS CC, Scopus, and IEEE Xplore databases, with the keywords “smart chair” and “sensor chair” were analysed. 15 articles were processed, with their research being based on the use of different types of sensors that determine the contact pressures between the user’s body and stool parts and recognise different body positions when sitting, which can prevent negative health consequences. Analysed papers prove that the use of smart technology and a better understanding of sitting, using various sensors and applications that read body pressure and determine the current body position, can act as preventive health care by detecting proper heart rate and beats per minute, the activity of individual muscle groups, proper breathing and estimates of blood oxygen levels. In the future research, it is necessary to compare different types of sensors, methods used and the results obtained in order to determine which of them are most suitable for the future development of seating furniture for work.

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Journal articles on the topic 'Office chair'

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