Backrest Height Research Articles

A combined approach of design for Six Sigma, generic product development process and ergonomics-safety philosophy to reduce musculoskeletal disorder problems

Purpose The purpose of this paper is to decrease musculoskeletal disorder (MSD) problems using a combined approach including design for Six Sigma, generic product development process, and ergonomic-safety philosophies. Design/methodology/approach A total of 550 students voluntarily participated in this study. Kolmogorov–Smirnov and t-tests were used to analyze the collected anthropometry. A cause-and-effect diagram, Pareto’s chart, a brainstorming session, and a priority matrix were also used to extract the 22 design parameters of the product. Moreover, Cronbach’s alpha values were determined to verify the validity of qualitative and quantitative data. Findings Results showed that students are at a high risk of developing MSD issues. The most serious MSD problems among the students were neck pain (74%), back pain (73%), muscle and joint pain (67%), knee pain (57%), leg pain (54%), etc. Besides, all anthropometrics of males are higher than females except Hip Breadth. Among 12 anthropometries, two measurements and one measurement showed statistical significance at p < 0.01 and p < 0.05, respectively. Six design parameters of the mounted desktop (Seat Height, Desk Height, Seat to Desk Clearance, Seat Width, Seat Depth, and Backrest Height) are the most crucial design parameters to design and develop the product. Practical implications The proposed design of the mounted desktop can be used in different tertiary educational institutes to reduce MSDs among students. Originality/value To the best of the authors’ knowledge, this is the first attempt that introduces a combined approach to reduce MSD issues by applying Six Sigma, a generic product development process, and ergonomics-safety philosophy to design and measurement of 22 design parameters of mounted desktop for university students.

Ergonomics in Bicycle Saddle Design: Application of TRIZ Innovation System Method with IPA-Kano Model Validation

This study investigates the innovative design of a bicycle saddle by incorporating sustainable ergonomics, universal design principles, and systematic innovation methods. Initially, the literature related to bicycle saddle design and its impact on the human body during riding was analyzed. The TRIZ contradiction matrix was then used to identify relevant invention principles, which served as references for the innovative design of the bicycle saddle. Biomechanics and the human–machine system analysis within human factors engineering were applied to ensure the innovative design is ergonomic and user-friendly. The design features a horizontally expandable and foldable bicycle saddle, enhancing its adaptability and sustainability. Universal design principles were applied to make the innovative design more accessible to the general public, and the prototype was simulated using Inventor drawing software. The research results include: (1) An innovative bicycle saddle design with horizontal expansion and folding functions is proposed. This design divides the saddle into three components, enabling the left and right parts to expand or retract based on user preferences. (2) A bicycle backrest design featuring vertical adjustability is introduced. It incorporates a quick-release adjustment mechanism at the junction of the backrest and saddle, allowing users to freely adjust the backrest height. (3) A quick-operation bicycle saddle design is presented, utilizing quick-release screws to facilitate the swift operation of the horizontal expansion and folding mechanisms. This validation method confirmed that the innovative design meets both sustainable ergonomic standards and user expectations. The systematic innovation approach used in this study can serve as a valuable reference for future research and design applications.

Mismatch between fixed classroom furniture and anthropometric measurements among university students: Relationships to ergonomic risk.

Appropriate arrangement of classroom ergonomics is necessary for maintaining health and improving academic performance, learning, and motivation. We aimed to determine the anthropometric measurements and ergonomic risk levels of students during a handwriting activity on a fixed desk and chair and to analyze the mismatch and relationships between these factors. This study included 149 university students (female:73, male:76). Anthropometric measurements (lower and upper extremity length, shoulder height, elbow-rest height, hip-popliteal length, popliteal height, knee height, the distance between tragus and wall, and between acromion and wall) were done with a tape measure. The Rapid Upper Limb Assessment (RULA) tool was conducted to determine the ergonomic risk level while students wrote a standard text on a fixed desk and chair as if they were taking notes in the classroom. The mismatch was evaluated between backrest height and sitting shoulder height, seat height, and popliteal height. The Pearson Chi-Square and the Spearman Correlation test were used for statistical analysis. The median values of the participants' age, height, weight, and BMI were 22 years, 1.70 m, 68 kg, and 23.18 kg/cm2, respectively. Most students had inadequate ergonomic posture while writing on fixed furniture at the university (Median RULA grand score: 4). More mismatches for seat height (54.4%) were found in high ergonomic risk levels but mismatches for backrest height did not follow a similar result. More investigation should be conducted with prospective studies including interventions like adjustable furniture.

Relationship between Learning Environment Design and Musculoskeletal Disorders in Learners

Introduction: Students spend most of their day at school sitting in their classroom furniture which is not quite the right size for students. This can be uncomfortable and even lead to back pain, leg cramps, and other problems. Method: Students’ body size for good posture while sitting, include popliteal to floor height, elbow to seat height, thigh thickness, sitting height, buttock to popliteal length, buttock to knee length, elbow to elbow breadth, the width of bitrochanter, subscapular height, and sitting shoulder height, and one standing is stature. Similarly, dimensions of chair-with-table, like seat height, the upper edge of the backrest, seat width, seat depth, table length, table width, table height, backrest height, and footrest currently used in the classroom were taken. The study compared students' anthropometry data with the furniture dimension data to obtain a match or mismatch between them with the help of standard mismatch equations. Results: The study reported that the mean body measurements of males are larger than females except for the width of bitrochanter. Seat width, seat depth, backrest height, and the upper edge of the backrest showed high mismatch percentages in students when patronising chairs. Table length reported high mismatch percentages among students. Conclusion: Using the users’ body sizes for furniture design will reduce musculoskeletal disorders and improve users’ sitting position. The recommended dimensions in furniture design will ergonomically fit students’ anthropometric measurements.

Ergonomic Design of Noseless Bicycle Saddle using UPVC/Silica-Aerogel

Introduction: During cycling most of the people suffer from perineal pain due to the pressure acting on the perineal area by the nose of the seat. Also Unsupported sitting on the saddle in a forward bending posture for longer time induce low back pain (LBP) among cyclists. So this paper presents the design of noseless bicycle seat with backrest using UPVC/Silica-Aerogel. Methods: This seat is designed as per the anthropometric dimensions of human body. Various parameters such as Lumbar position, seat tilt angle, seat position, backrest angle, seat height, backrest height, seat and backrest width are considered and the optimal value is determined while designing. The material chosen for the base of seat is UPVC/Silica- Aerogel composite and the cushioning material is chosen as polyurethene foam. The design is executed in 3D modelling software and validated using FEA package. Results: The maximum stresses induced in the newly proposed material UPVC/Silica-Aerogel (4.41MPa) is lesser than its yield strength (59 MPa). The maximum anterior stress of noseless seat is found out to be 24.5 kPa which is lower than that of the saddle with nose (41 kPa). Conclusion: As the anterior stress of noseless seat is lesser, the perineal pressure of cyclists is greatly reduced and this decreases the health problems associated with the perineal pressure. Also the backrest of the seatpan enhances the supporting of back muscles and reduces LBP among cyclists.

Ergonomic design of computer laboratory furniture: Mismatch analysis utilizing anthropometric data of university students

Many studies have shown that ergonomically designed furniture improves productivity and well-being. As computers have become a part of students' academic lives, they will continue to grow in the future. We propose anthropometric-based furniture dimensions that are suitable for university students to improve computer laboratory ergonomics. We collected data from 380 participants and analyzed 11 anthropometric measurements, correlating them with 11 furniture dimensions. Two types of furniture were found and studied in different university computer laboratories: (1) a non-adjustable chair with a non-adjustable table and (2) an adjustable chair with a non-adjustable table. The mismatch calculation showed a significant difference between existing furniture dimensions and anthropometric measurements, indicating that 7 of the 11 existing furniture dimensions need improvement. The one-way ANOVA test with a significance level of 5% also showed a significant difference between the anthropometric data and existing furniture dimensions. All 11 dimensions were determined to match students' anthropometric data. The proposed dimensions were found to be more compatible and showed reduced mismatch percentages for nine furniture dimensions and nearly zero mismatches for seat width, backrest height, and under the hood for both males and females compared to the existing furniture dimensions. The proposed dimensions of the furniture set with adjustable seat height showed slightly improved match results for seat height and seat-to-table clearance, which showed zero mismatches compared with the non-adjustable furniture set. The table width and table depth dimensions were suggested according to Barnes and Squires' ergonomic work envelope model, considering hand reach. The positions of the keyboard and mouse are also suggested according to the work envelope. The monitor position and viewing angle were proposed according to OSHA guidelines. This study suggests that the proposed dimensions can improve comfort levels, reducing the risk of musculoskeletal disorders among students. Further studies on the implementation and long-term effects of the proposed dimensions in real-world computer laboratory settings are recommended.

Rancang Ulang Meja dan Kursi untuk Kelas 1 di SMK Negeri 3 Medan dengan Menggunakan Metode RULA dan Pahl & Beitz

SMKN 3 students use tables and chairs for approximately six hours a day during the teaching and learning process. If the sitting posture of this student is not correct, such as leaning forward or a footrest that is too high, of course it can cause pain in the waist and pain in the knees. This study aims to make tables and chairs that are comfortable for use by students of SMKN 3 MEDAN and to find out the design for ergonomic tables and chairs so that when using tables and chairs students do not feel pain in the waist or other complaints. This study resulted in a new table and chair design. Based on the calculation results, the results of the new chair dimensions were as follows: table height 71.15 cm, table length 58 cm, table width cm, seat cushion width 32 cm, seat cushion length 43 cm, height seat cushion 40 cm, backrest height 54 cm. The dimensions of the bag are 10 cm for width, 40 cm for height, 30 cm for length. Therefore the tables and chairs that have been redesigned are in accordance with the anthropometry of students at SMKN 3 MEDAN

Association of self-reported musculoskeletal pain with school furniture suitability and daily activities among primary school and university students.

Students spend a considerable amount of time in school. This study aimed to determine the prevalence of musculoskeletal pain and the association between the pain and suitability of school furniture and daily activities among primary school and university students. A total of 238 primary and university students participated in the study. The adapted Nordic questionnaire was used to assess pain prevalence, the BackPEI questionnaire was used to assess school-related factors, and student furniture mismatch calculations were performed to determine the anthropometric suitability of school furniture. Most students did not have a proper body posture while sitting, did not lift objects properly, and used TV and computer frequently. A high student-furniture mismatch was found for seat and desk height. The neck, lower back, shoulders, and upper back were the most affected body parts. Our study confirmed that musculoskeletal pain occurs in primary school students and increases with age, especially lower back pain. Proper backpack wearing was found to be an important factor in alleviating neck pain. Students who sat or lifted objects properly were more likely to report upper back pain, and students whose backrest height was appropriate were more likely to report lower back pain. Further efforts should be made to establish a comparable study protocol using objective methods to obtain more valid and reliable data to study school-related risk factors for musculoskeletal pain in students using prospective study protocols.

Design of ergonomic chair for the embroidering processes of the bag making (case study: CV. Pinus Bag’s Specialist)

Physical activities related to work activities in production operators are jobs that need attention—operator activity on a CV. Pinus Bag’s Specialist engaged in convection, especially in the embroidery process, is done using a machine; the design will be sent from the computer to the embroidery machine monitor. The operator on duty would set the fabric to be embroidered, thread the needle, frequently change the thread, and correct the twisted thread. Meanwhile, the risk level of the embroidery workers has not been evaluated, and no unique chairs have been designed for it. Then, this study will assess the risk level of employees working in the embroidery department and create ergonomic chairs that are comfortable, durable, and robust. The risk level of workers is assessed using REBA. It uses anthropometric data from 2 workers who work in the embroidery section at CV. Pinus Bag’s Specialist, Yogyakarta, Indonesia. The anthropometric data come from buttocks-popliteal length (seat length), popliteal height (chair height), hip width in the sitting position (chair base width), and side shoulder width (chair back width). And shoulder height in the sitting position (backrest height). After that, the chair is designed with the help of the application. The study indicates that most of the work activities in the embroidery process require corrective action. In addition, the chair design used for the embroidery process is adjustable, comfortable, durable, and strong. The seat height is adjustable with an operator and an embroidery table. Ultimately, the embroidered chair reduced work risk from medium to work postures with low work risk.

REDESIGN KURSI BONCENG ANAK YANG ERGONOMIS PADA KENDARAAN RODA DUA

Now it has become a tendency for every parent to bring their baby in all their activities from shopping to malls or traditional markets and not even a few who take their babies while doing work outside the home. many parents wanted a multifunctional pillion chair. One way to do this is to identify what the customer wants and develop pillion chair products using the Quality Function Deployment (QFD) approach. the design concept of the added child pillion chair is to be multifunctional. The multifunctionality in question is that the child's pillion chair has been developed to become a stoller as well so that parents who have children 1-3 years old when traveling using two-wheeled vehicles are not tired of carrying their children. The development of this pillion chair is also based on ergonomic aspects by using the anthropometric method of measuring the child's body. The results of the ergonomic analysis of the child pillion chair using anthropometric calculations are that the seat width is 29cm the seat length is 22cm the backrest height is 31cm the armrest height is 18cm the footrest height is 24cm the seat belt length is 33cm.

Ofis Sandalyeleri için Ergonomik Tasarım Yaklaşımlarının Uygunluk Seviyelerine Göre Karşılaştırılması

Aim of study: It is very important to design office furniture based on the anthropometry of employees because it affects their comfort, performance, and in serious cases, their health. Adjustable chairs are typically designed for a certain percentile of the user population. However, this design approach may not provide an accommodation level as intended because a chair has more than one design dimension. The objective of this study is to compare the percentile-based design approach and subject-based design approach by accommodation level. 
 Material and methods: A sample of 4.082 males from the 2012 ANSUR II database was used to compare two design approaches by accommodation level. An adjustable office chair was designed to investigate whether or not the final accommodation level differed from the desired accommodation level. Using four anthropometric measurements, the lower and upper limits for four chair dimensions are calculated to cover 95% of users. 
 Main results: The anthropometric measurements of a total of 728 subjects (17.83%) did not match for at least one chair dimension, resulting in the adjustable chair accommodating 82.17% of users, rather than 95% as intended. Two additional chair dimensions (backrest height and width) reduced the accommodation level to 77.36%. 
 Highlights: Considering that eleven different chair dimensions are considered in a typical chair design, it is reasonable to assume that the accommodation level will be even lower.

Anthropometric Seat Design for Bus Drivers in Southwestern Nigeria

Most buses used in Nigeria are imported; thus, the anthropometric dimensions of the citizens of the country of manufacture were used for the seat design. Poorly designed seats due to a mismatch in anthropometric measurements may lead to musculoskeletal disorders. Hence, there is a need to design an appropriate seat for particular bus drivers. This study aimed to obtain anthropometric dimensions of Nigerian bus drivers and design an appropriate driver’s seat based on the collected dimensions. Relevant anthropometric variables necessary for the driver’s seat design were obtained from 150 randomly selected male bus drivers from seven towns in Ogun, Oyo and Lagos states. Seat dimensions of 50 urban buses in heavy and medium automobile categories were considered. The means, standard deviations and 5th, 50th and 95th percentiles were calculated. The existing seat dimensions were compared with the required anthropometric measurements of the drivers for the seat design. It was found that the current seat measurements differed from the suggested seat dimensions. The study highlighted that in designing and producing bus seats for Nigerian bus drivers, their anthropometric data should be considered. The study recommended that the dimensions of the driver’s seat should be 46.45-50.45 cm (seat height); 39-48.26 cm (seat depth); 46.83 cm (seat front width); 53 cm (backrest height); 49-58.26 (backrest depth); and 90° to 130° (seat backrest angle).

Assessing the ergonomic status of commonly used chairs in Iran's universities based on combinational equations and anthropometric indices.

Inappropriate design of chairs and disproportion with students' body dimensions can influence their physical and mental health as well as their educational efficiency and concentration. The aim of this study was to examine the ergonomic status of commonly used chairs in Iran's universities using combinational equations and anthropometric indices. Participants in this cross-sectional study were 166 students in Iran. Eleven anthropometric parameters of the students and nine dimensions in seven types of commonly used chairs in Iran's universities were measured. Combinational equations were used to determine the fitness of the chairs. There was a major mismatch between most students' anthropometric measurements and the dimensions of the chairs. Backrest height and seat height were the best and the worst features, respectively, according to ergonomic recommendations for chairs. The recommended measurements of seat height, seat depth, seat width, desk height, desk width, desk length, backrest width, backrest height, and desk distance were 332, 420, 436, 245, 95, 511, 426, 550, and 281 mm, respectively. None of the commonly used chairs in Iran's universities were found to be a good fit to the students' anthropometric dimensions. Therefore, in order to prevent inappropriate body postures, chair designs have to reviewed, and made to fit with Iranian students' anthropometric data. The recommended measurements obtained in this study can be used to design a suitable ergonomic chair to match with a high percentage of Iranian students.

Approach for ergonomic assessment of self-propelled combine harvester seats based on anthropometric body dimensions

Objectives. The seat dimensions of self-propelled combine harvesters are designed without consideration of body dimensions of the user population and vary with make and models of combines. Methods. This research proposes a method to determine the percentage of seat match, upper mismatch and lower mismatch using the anthropometric body dimensions of Indian harvester operators. The seat dimensions of five popular combine harvester makes were measured and compared to the body dimensions of the operators. Results. The selected seats had 100, 44–70, 81–96, 98–100, 63–83, 59–94 and 55–97% mismatch for seat height, seat length, seat pan breadth, seat backrest height, upper backrest breadth, lower backrest breadth and steering wheel clearance, respectively. These data were used to recommend seat dimensions for combine harvesters. Seat height, seat length, seat pan breadth, seat backrest height, upper backrest breadth, lower backrest breadth and steering wheel clearance are recommended as 399, 362, 456, 400, 243, 386 and 190 mm, respectively. Conclusions. The recommended seat dimensions matched the user population anthropometric dimensions 94–100%. This approach will help to assess seat dimensions based on anthropometric data for a comfortable posture to prevent health risks such as musculoskeletal disorders (MSDs) among operators.

A Comparison of Multiple Machine Learning Algorithms to Predict Whole-Body Vibration Exposure of Dumper Operators in Iron Ore Mines in India

Background: This study deals with some factors that influence the exposure of whole-body vibration (WBV) of dumper operators in surface mines. The study also highlights the approach to improve the multivariate linear analysis outcomes when collinearity exists between certain factor pairs. Material and Methods: A total number of 130 vibration readings was taken from two adjacent surface iron ore mines. The frequency-weighted RMS acceleration was used for the WBV exposure assessment of the dumper operators. The factors considered in this study are age, weight, seat backrest height, awkward posture, the machine age, load tonnage, dumper speed and haul road condition. Four machine learning models were explored through the empirical training-testing approach. Results: The bootstrap linear regression model was found to be the best model based on performance and predictability when compared to multiple linear regression, LASSO regression, and decision tree. Results revealed that multiple factors influence WBV exposure. The significant factors are: weight of operators (regression coefficient β=-0.005, p<0.001), awkward posture (β=0.033, p<0.001), load tonnage (β=-0.026, p<0.05), dumper speed (β=0.008, p<0.001) and poor haul road condition (β=0.015, p<0.001). Conclusion: The bootstrap linear regression model produced efficient results for the dataset which was characterized by collinearity. WBV exposure is multifactorial. Regular monitoring of WBV exposure and corrective actions through appropriate prevention programs including the ergonomic design of the seat would increase the health and safety of operators.

Designing of Facility Layout Ecobrick Material Using Ergonomic Intervention Reduce Muscoloskeletal Disorder

Kamulyan waste bank is a place to collect the waste from the household around Lowanu Village, Brontokusuman, Mergangsan, Yogyakarta. This waste is distributed to garbage collectors and sorted. Plastic waste that cannot be recycled is used as material for making ecobricks. Ecobricks are materials made from used plastic bottles filled with plastic sachets, plastic bags, and similar materials that are compressed. In making ecobricks, workers perform activities in a sitting position on the floor with both legs folded in and a slightly bent posture. This work attitude causes muscle complaints in the upper and lower neck, upper arm, right elbow, left wrist, and left hand. The purpose of the study was to improve work attitudes to reduce muscle complaints in body parts by designing ergonomic work facilities. This research was conducted with ergonomics intervention on the design of ecobrick plastic compaction work facilities with the Nordic Body Map-VAS Modified Questionnaire. The muscle complaints of the workers' body parts were determined using the Nordic Body Map questionnaire. The results of the study provide a design for compaction of ecobrick plastic materials with dimensions of table length 134.44 cm, table width 66.39 cm, table height 71.63 cm, length of seat mat 41.41 cm, width of seat mat 43.49 cm, height seat 44.51 cm, backrest height 55.5 cm, and backrest width 45.88 cm. Based on the NBM-VAS questionnaire, it shows that the initial condition of pain or pain in the upper neck and lower neck with a moderate pain value is aimed at a scale of 6.5 cm and 7.3 cm to mild pain with a scale of 4.2 cm and 4.3 cm. . Moderate pain in the left wrist and left hand with a scale of 6.1 cm, respectively, to no pain on a scale of 3.1 cm and 3 cm.

RE-DESAIN FASILITAS KERJA KURSI ERGONOMI UNTUK MENGURANGI RISIKO MUSCULOSAL DISORDERS MENGACU PADA NILAI ANTROPOMETRI DI PT. X

PT. X is a company engaged in manufacturing with Radiator products. From the results of the Nordic Body Map in the production department of the press shop line section, many workers have complaints in the muscles (musculoskeletal disorders) because the workplace is not ergonomic as many as 15 workers, including aches in the neck of 3 people, back pain 4 people, back pain 1, stiff neck 5 people, bent body 2 people. From these results, there needs to be further action by making the design of the seatwork facility ergonomic concerning anthropometric values. With this reference, the design of popliteal height (TPo) 41 cm, popliteal buttocks (PPO) 39 cm, hip-width 38 cm, backrest height (TSP) 45 cm, seated back width (LSD) 35 cm, eye height sitting (TMD) 73 cm, height of backrest (TSP) 13 cm

ERGO - EVALUATION OF URBAN BUS DRIVER’S WORKSTATIONS IN SOUTH WEST NIGERIA

This study evaluated the ergonomic performance of drivers’ workstations in southwest Nigeria. Fifty urban buses selected from ten brands were investigated by direct measurement. The buses were mini-A and midi-B. Vertical and horizontal distances of the seat reference point to the pedal and steering wheel, with the seat dimensions were considered. The anthropometric dimensions of 150 male bus drivers were taken from South-west Nigeria. The results revealed that the values for driver’s seat height from the cabin floor, seat backrest height, seat shoulder level width and low back width were 44.00- 50.00cm, 53.00-58.15cm, 40.00-50.00cm and - 40.15cm respectively as against 39.15- 43.00cm, 38.75-49.49cm, 34.60-43.59cm and 45.73-53.25cm respectively in the urban bus workstations. It is concluded that the drivers’ workstations in the urban buses were not ergonomically fit for the bus drivers since the anthropometric dimension of the Nigerian male bus drivers were not considered in the designing of the buses.

Chair dimension compatibility with elementary school students anthropometric data in North Jakarta

BACKGROUND In Indonesia, primary school begins at 6 years old and continues until 12, where most of their growth is experienced at that age. Non-ergonomic school furniture can harm the musculoskeletal system. This study evaluates the suitability of chair dimensions to elementary school student’s anthropometry in North Jakarta. METHODSA cross-sectional study of 98 students in North Jakarta. Chair dimension data and student anthropometry were measured using a tape measure, which was then analyzed using the Chi-Square Goodness of Fit Test to evaluate their suitability. RESULTSThe ages of the students ranged from 5 to 11 years. Anthropometric measurements of students show that the mean Sitting Shoulder Height is 41.81±4.36 cm, Popliteal Height 36.83±3.77 cm, Hip Breadth 25.88±3.47 cm, and Buttock-Popliteal Length 36.56±4.33 cm. While the average size assessed from the seat dimensions is Seat Height 41.71±0.22 cm, Seat Width 37.2±1.26 cm, Seat Depth 37.2±1.42 cm, and Backrest Height Above Seat 35.54±3.19 cm. The results of Goodness of Fit with Kendall's Tau-b critical value for the suitability of chair dimensions to student anthropometry were 0.37, and vice versa 0.672, which stated a discrepancy. CONCLUSIONThere is a mismatch between chair dimension and anthropometry of elementary school students in North Jakarta. Adjustment of chair dimensions needs to be done using a student's average size approach to prevent musculoskeletal disorders.

Anthropometric Dimensions and Classroom Furniture Measurements Among Pre-school Students in Kerman, South East of Iran

Introduction: With the alternation of the educational system from a three-stage into a two-stage system in Iranian schools since several years ago, five-year-old children entered from kindergartens to primary schools. This study was conducted to investigate the harmonization of classroom furniture with anthropometric dimensions in preschool students. Methods: In this cross-sectional study, 366 male and female preschool students were selected by cluster sampling method in Kerman, Iran. Some of the anthropometric dimensions such as shoulder, elbow, and popliteal height, popliteal buttock length, and buttock breadth were measured. mean, maximum, minimum, standard division, and 5th, 50th, and 95th percentiles were calculated for both the sexes and were compared with five dimensions of the existing seats. Next, the dimensions of the standard seats were determined according to the anthropometric dimension’s students. Data were analyzed using SPSS 21 . Results: Independent-Samples T-test between girl and boy pre- school students in Kerman city showed just popliteal height had a siginificnt diference (p ≤0.05). Match of antropometric musurmants with seat dimentions indicated that there is no consistency between the seats and anthropometric dimensions in. Armrest height, seat height, backrest height, seat depth and seat breadth were matched with (0, 0.5, 10, 6.7, 0) and (0.7, 28.7, 6, 2.5, 0) percent of anthropometric musurments of girl and boy students respectively Conclusions: Due to adding a new grade to primary school, it seems that no work has been done for improving the furniture. Therefore, in this article, we presented the dimensions of an appropriate seat. This may help not only save production costs in the industry but also increase the matching between students' anthropometric and seat dimensions.