|Year : 2021 | Volume
| Issue : 4 | Page : 215-222
Evaluation and analysis of new design traditional handloom performance in reducing work musculoskeletal disorders among Sarong Samarinda female weavers: A quasi-experimental study
Iwan Muhamad Ramdan1, Krishna Purnawan Candra2
1 Departement Occupational Health and Safety, Faculty of Public Health, Mulawarman University, Samarinda, Indonesia
2 Departement of Agricultural Product Technology, Faculty of Agriculture, Mulawarman University, Samarinda, Indonesia
|Date of Submission||17-Feb-2021|
|Date of Acceptance||01-Aug-2021|
|Date of Web Publication||18-Dec-2021|
Dr. Iwan Muhamad Ramdan
Faculty of Public Health, Mulawarman University, Jl. Sambaliung, Kampus Gunung Kelua, Samarinda 75119
Source of Support: None, Conflict of Interest: None
| Abstract|| |
Background: Work musculoskeletal disorder (WMSDs) are occupational health problems whose prevalence is still high in various countries. Ergonomic interventions are the most successful approach to reducing WMSDs. This study evaluated the effect of redesign traditional handloom on the work posture and musculoskeletal disorders of Samarinda Sarong traditional weavers.
Methods: The quasi-experiment has been carried out on 40 traditional weavers from February to September 2019 in Samarinda, Indonesia. The weaver using the new design handloom then evaluated its impact on work posture and WMSDs in the first 3 months and the second 3 months. Work posture was assessed using Rapid Upper Limb Assessment (RULA). WMSDs were assessed using a Nordic Body Map questionnaire. Data were analyzed using Friedman and Dunn's test.
Results: The RULA score decreased from 7 to 3 and 2, while the WMSD risk at “very high” level decreased from 12.5% to 7.5% and 2.5% and the WMSD at “high” risk level decreased from 87.5% to 10.0% and 5.0% following the introducing of the new design traditional handloom at 3 and 6 months, respectively.
Conclusions: The new design of the traditional handloom on Sarong Samarinda female weavers has succeeded in improving work posture and reducing WMSDs.
Keywords: Ergonomics, musculoskeletal, posture, work
|How to cite this article:|
Ramdan IM, Candra KP. Evaluation and analysis of new design traditional handloom performance in reducing work musculoskeletal disorders among Sarong Samarinda female weavers: A quasi-experimental study. Int J Crit Illn Inj Sci 2021;11:215-22
|How to cite this URL:|
Ramdan IM, Candra KP. Evaluation and analysis of new design traditional handloom performance in reducing work musculoskeletal disorders among Sarong Samarinda female weavers: A quasi-experimental study. Int J Crit Illn Inj Sci [serial online] 2021 [cited 2022 Sep 24];11:215-22. Available from: https://www.ijciis.org/text.asp?2021/11/4/215/332869
| Introduction|| |
Work musculoskeletal disorders (WMSDs) are occupational health problems that still often occur in developing and developed countries, including the USA, European countries, and Korea as well as Japan.
The leading cause of WMSDs is manual material handling work performing repetitive loads carrying, holding, lifting, lowering, pushing, and pulling activities. Other studies showed that awkward postures, prolonged static work, repetitive movements, forceful exertions, and vibrations are the other common risk factor of WMSDs., WMSDs adversely affect individual workers and business activities, including reducing work productivity and well-being of workers, increasing medical cost,,, decreasing job satisfaction, degrading the quality of the physical and mental dimensions of health, and causing daily activity limitation. A previous research showed that ergonomic interventions were the most successful interventions in preventing or reducing the incidence of WMSDs.,
A recent study showed that the prevalence of musculoskeletal disorders (MSDs) among female weavers using handlooms in Indonesia was found to be approximately 85%, with the incidence of low, moderate, and high musculoskeletal pain ratings at 15.0, 7.5, and 77.5, respectively. The skeletal muscle pain was primarily in the lower neck, shoulders, upper hands, bottom, waist, thighs, calves, and ankles. MSDs were associated with the education level, work experience, prolonged sitting time, work posture, and body anthropometry of each weaver. Work posture was the dominant variable responsible for MSD prevalence. To overcome the problems, an advanced study to design new traditional handloom based on anthropometry data was constructed.
| Methods|| |
Experimental design and data analysis
The old and new design traditional handloom dimensions in this study are presented in [Table 1]. While the construction of the new design chair and table of traditional handloom are presented in [Figure 1] and [Figure 2], respectively. A quasi-experiment, of 40 female weavers of Samarinda Sarong in Samarinda, Indonesia, was conducted from February to September 2019.
|Figure 1: Handloom chair. A: Front/rear legs, B: Cushion/seat, C: Armrest, D: Backrest adjuster (manual), E: Backrest|
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|Figure 2: Handloom table. A: Footstep, B: Cloth boom, C: Chest block, D: Swing arm, E: Weaving comb, F: Warp boom, G: Gun/Beater, H: Lade for threading, I: Handloom frame, J: Batting rod|
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The weavers regularly used the new design of traditional handloom during the study. The work posture and WMSDs were measured 3 and 6 months after introducing the traditional handloom to the female weaver of Samarinda Sarong. Most weavers (92%) worked for 4–8 h a day for 6 days per week. Work posture and WMSD data using old traditional handloom (before introducing the new design traditional handloom) on the weavers were used as the baseline data.
Work posture data (Rapid Upper Limb Assessment [RULA] score), WMSD data (Nordic Body Map [NBM] category) for pain level, and the risk category were analyzed by Friedman test followed by Dunn's test (P = 0.05).
Measurement of work posture and work musculoskeletal disorder complaint
The weavers' work posture of musculoskeletal operator system was determined by fast judgment using RULA as suggested by McAtammney and Corlet, with four levels, i.e., low (0-20), medium (21-41), high (42-62) and very high (63-84). WMSD complaint of the weavers was measured by standardized NBM questionnaire as suggested by Kourinka et al., with four levels, i.e., low (1-2), medium (3-4), high (5-6) and very high (7+) [Table 2].
|Table 2: The risk level of work posture and work musculoskeletal disorders and recommendation|
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| Results|| |
In the present study, at first, a total number of 40 female weavers, who used old traditional handloom, were determined for handloom performance (work posture, MSD pain, and risk category). By introducing the new design traditional handloom, the handloom performance was determined by measure work posture, MSD pain, and risk category of the female weavers after 3 and 6 months. All the weavers completed the experiment without any withdrawal. The flow of the present study is presented in [Figure 3].
|Figure 3: Research flowchart. WMSDs: Work Musculoskeletal disorders, RULA: Rapid Upper Limb Assessment, NBM: Nordic Body Map|
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Most weavers are at the age of 38–44 (35%) and 45–51 years (17.5%). Elementary school is the dominant education background level (52.2%), and 60% have working experience of fewer than 5 years. The majority of the weavers have working hours per day of 4–8 h (92.5%) [Table 3].
Improvement of weaver's work posture
Most of the weavers have low work posture at the beginning of the experiment (before introducing the new design traditional handloom) in the arm, wrist, neck, trunk, and leg segment, i.e. 52.5% and 45.0% for 7 and 6 of RULA score (C score) [Table 4]a, which means that the work posture of weavers using old design traditional handloom was “high” and “very high” risk. The condition needs investigation and changes implementation, as also recommended by a previous study.
|Table 4: The acceptance and the change level of female Sarong Samarinda weavers (n<40) Work-musculoskeletal disorders (WMSDs) on using old and new traditional handloom|
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The weaver's work posture improved significantly (P < 0.001) [Table 4]b following introducing a new design of traditional handloom. The RULA score (C score) decreased from 7 to 3 and 2 after introducing the new design traditional handloom at 3 and 6 months.
Declining of work musculoskeletal disorder pain and risk
The WMSD pain of the most upper and lower body part decreased significantly (P < 0.001) except for the left elbow (P = 0.991) [Table 5] and right leg wrist (P = 0.356) [Table 6]. The data show that the new design of traditional handloom is very compatible with the female weavers. The more they use the new design handloom, the more decreasing of WMSDs occurred. The WMSD risk of the female weavers decreased significantly (P < 0.001)following introducing of the new design traditional handloom [Table 7], which the detail data is presented at [Supplementary Table 1]. The WMSD risk at “very high” risk level of the female weaver decreased from 12.5% to 7.5% and 2.5% at 3 and 6 months, respectively, following introducing of the new design handloom. The WMSDs at “high” risk level decreased from 87.5% to 10.0% and 5.0% at 3 and 6 months of introducing the new design handloom, respectively.
|Table 5: The pain level of musculoskeletal disorder symptoms in upper body parts (based on Nordic Body Map) of female Sarong Samarinda weavers (n<40) and performance of the old and new design traditional handloom|
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|Table 6: The risk level of musculoskeletal disorder symptoms in the lower body part (based on Nordic Body Map) of female Sarong Samarinda weavers (n<40) and performance of old and new design traditional handloom|
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|Table 7: Effect of new design traditional handloom introduction on Nordic Body Map score and risk category of a female weaver|
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| Discussion|| |
The newly designed handloom with anthropometry based has significantly improved the female weavers' work posture. The work posture was improved by fixing the weaving chair's height and the height of the weaving table. A good work posture achieved in this study indicated that the position of head, neck, trunk, and shoulders does not seem to deviate from a neutral position severely. Besides, the posture of the elbows is appropriate.
The underneath table height was lengthened to provide sufficient space on both legs of the weaver. The handloom's upper backrest height (the vertical distance from the top side of the seat surface to the highest point of the backrest) is set to > 47 cm, which is the ergonomic central key element in chair design to keep the sitting posture and healthy spine. The handloom chair's height is designed based on the size of the popliteal height, which effectively improved work posture and reduced the hazards associated with prolonged standing. A previous study showed that the changes in workstations in the spice packaging in a food factory line with the appropriate workers' anthropometric data reduced the awkward postures in the neck and shoulders.
The addition of handloom chair backrest (the tilt can be adjusted at 90°–120°) significantly improved sitting posture and reduced complaints of WMSDs, especially on the back, waist, buttock, and bottom. In line with the previous studies, the chair's backrest is beneficial for reducing disc pressure and avoiding the risk of MSD and discomfort.
In this research, we also added armrest height and armrest length for handloom chair and set 37.45 and 37.00 cm, respectively. It is intended to provide the opportunity for relaxation on the shoulder, upper and lower hand, elbow, and hand-wrist. In addition to armrest in the new design, traditional handloom could reduce WMSD complaints on these body parts. Following previous research, the appropriate height adjustment, sufficient armrests, and padding can reduce pressure on the forearms and elbows' undersides.,
The primary modification of the traditional handloom in this study was in chair design. The anthropometric approach in designing the new traditional handloom resulted in an ergonomic chair of traditional handloom for the female weavers of Sarong Samarinda. In line with previous work that ergonomic chairs positively impact the reduction of WMSDs, such as arm and low back pain., Ergonomic interventions can have a beneficial effect on improving work posture and reducing MSDs among workers., The traditional handloom chair dimension in this study is recommended for traditional handloom in Southeast Asia due to the relatively same body dimension as the female weaver of Sarong Samarinda. It is better than practicing exercises in between of using the old handloom, which only reduce a bit MSDs among the weavers.
Advanced research is planned to design the handloom chairs with some different soft cushion materials to reduce the WMSD complaints on buttock and bottom muscles. Lee et al. reported that chair cushion choice could distribute interface pressure differently.
| Conclusions|| |
This study demonstrated that the new design of traditional handloom has succeeded in improving work posture and reducing WMSDs. The new design handloom dimension in this report enriches the consideration of designing a traditional handloom for weavers in the Southeast Asian region.
Research quality and ethics statement
This study was approved by the Ethical Commission of Health and Medical Research, Faculty of Medicine, Mulawarman University, Indonesia (Approval number 33/KEPK-FK/ IV/2018; Approval date Apr 9, 2018). Written informed consent was obtained from the participants prior to their participation. The authors followed applicable EQUATOR Network (http://www.equator-network.org/) guidelines during the conduct of this research project.
The authors are very grateful to all the traditional weavers who participated in this study.
Financial support and sponsorship
This study was funded by the Higher Education Directorate of the Ministry of Research Technology and Higher Education of Indonesia (Award number: 7/E/KPT/2019).
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2], [Figure 3]
[Table 1], [Table 2], [Table 3], [Table 4], [Table 5], [Table 6], [Table 7]