Original Article

Evaluation of Compressive and Shear Forces Exerted on the Lower Back in Manual Load Handling Tasks in Young Workers of Selected Block Maker Using 3DSSPP


Manual load handling is a work activity related to low back disorders and can impose a high mechanical load on the lower back. The present study aimed to investigate forces exerted on the lower back during manual handling in young workers in selected block maker workshops. This Descriptive, cross-sectional study was carried out on 40 young workers with an average age of 31 years in several block maker industries in 2020. 3DSSPP Software was used for biomechanical analysis of the forces exerted on the lower back. Prevalence of musculoskeletal disorders was assessed using the Standard Cornell Questionnaires. To analyze the data from SPSS19 software and Spearman, Friedman and ANOVA correlation tests were used to determine the relationship between demographic variables and the prevalence of musculoskeletal disorders and the relationship between the prevalence of musculoskeletal disorders and the amount of compressive and shear forces on workers' backs. The results showed that the mean compressive and shear forces exerted to the lumbosacral joint (L5 / S1) were 3194.8±1064.4 and 473.2± 89.5 N, respectively, and for the intervertebral disc (L4 / L5) were 3924.8±434.9 and 383.2 ±154.5, respectively The findings also indicated that the highest prevalence of pain was related to the lower back and right knee with 45% and 30%, respectively. The direct relationship exists between the mean score of musculoskeletal disorders obtained from the Cornell questionnaire with age, work experience and weight and body mass (0.001> P). The shear forces exerted to the lower back were higher than the permissible levels in about 30 to 37% of people and the compressive forces were on average in 42.5% of people, which can cause a lot of injuries to the back in the long term. The results obtained according to the study population show that manual load handling for these ages is dangerous and in the future and at older ages, people may suffer serious injuries and disorders, especially in the lower back.

Abadi, Ali Salehi Sahl, Adel Mazlomi, Gebraeil Nasl Saraji, Hojjat Zeraati, Mohammad Reza Hadian, and Amir Homayoun Jafari. 2015. 'Effects of box size, frequency of lifting, and height of lift on maximum acceptable weight of lift and heart rate for male university students in Iran', Electronic physician, 7: 1365. doi: 10.14661/2015.1365
Abadi, Ali Salehi Sahl, Gebraeil Nasl Saraji, Adel Mazloumi, Hojjat ZERAATI, Mohammad Reza Hadian, and Amir Homayoun Jafari. 2016. 'Changes in Back Compressive Force When Measuring Maximum Acceptable Weight of Lift in Iranian Male Students', Iranian journal of public health, 45: 1199.
Abedi, Mahbobbeh, Aioob Ghanbary, Ehsanollah Habibi, Feizollah Palyzban, Hamed Ghasemi, and Ali Abbas Hasani. 2018. 'Back Compressive Force (BCF) assessment using UTAH method in manual handling tasks among workers of a chemical manufacturing company', Journal of Occupational Health and Epidemiology, 7: 222-26. http://johe.rums.ac.ir/article-1-320-en.html
Afifehzadeh-Kashani, H, A Choobineh, Shahnaz Bakand, MR Gohari, H Abbastabar, and P Moshtaghi. 2011. 'Validity and reliability of farsi version of Cornell Musculoskeletal Discomfort Questionnaire (CMDQ)' https://ro.uow.edu.au/sspapers/1559
Allahyari, Teymour, Sara Hedayati, Hamidreza Khalkhali, and Fariba Ghaderi. 2014. 'A comparative survey on forces exerted to low back in patient manual handling', Iranian Journal of Ergonomics, 2: 1-8. http://journal.iehfs.ir/article-1-74-en.html
Asadi, Naeimeh, Alireza Choobineh, Sareh Keshavarzi, and Hadi Daneshmandi. 2015. 'Estimation of forces exerted on the lower back in manual load lifting using 3DSSPP software', Iranian Journal of Ergonomics, 2: 25-31. http://journal.iehfs.ir/article-1-157-en.html
Attwood, Dennis, and Daniel A Crowl. 2007. Human factors methods for improving performance in the process industries (Wiley Online Library). DOI:10.1002/0470118849
Bevan, Stephen. 2015. 'Economic impact of musculoskeletal disorders (MSDs) on work in Europe', Best Practice & Research Clinical Rheumatology, 29: 356-73. https://doi.org/10.1016/j.berh.2015.08.002
Choobineh, Alireza, Sayed Hamidreza Tabatabaei, Abbas Mokhtarzadeh, and Maryam Salehi. 2007. 'Musculoskeletal problems among workers of an Iranian rubber factory', Journal of occupational health, 49: 418-23. https://doi.org/10.1539/joh.49.418
Das, Dipayan, Awadhesh Kumar, and Monica Sharma. 2020. 'A systematic review of work-related musculoskeletal disorders among handicraft workers', International Journal of Occupational Safety and Ergonomics, 26: 55-70. https://doi.org/10.1080/10803548.2018.1458487
Dianat, Iman, and Arezou Salimi. 2014. 'Working conditions of Iranian hand-sewn shoe workers and associations with musculoskeletal symptoms', Ergonomics, 57: 602-11. https://doi.org/10.1080/00140139.2014.891053
Dormohammadi, A, M Motamedzade, E Zarei, M Asghari, and S Musavi. 2013. 'Comparative assessment of manual material handling using the two methods of NIOSH lifting equation in a tile manufacturing company MAC and revised', Iran occupational health, 10: 71-81. http://ioh.iums.ac.ir/article-1-850-en.html
Eskandari, D, N Norizadeh, H Saadati, S Mohammadpour, and A Gholami. 2012. 'The prevalence of musculoskeletal disorders and occupational risk factors in Kashan SAIPA automobile industry workers by key indicator method (KIM)', JOHS, 2: 27-36.
Faghih, MA, M Motamedzadeh, H Mohammadi, M Habibi Mohraz, H Bayat, M Arassi, S Musavi, and I Noori Javadi. 2013. 'Manual material handling assessment by snook tables in Hamadan casting workshops', Iran occupational health, 10: 60-69. https://www.scopus.com/inward/record.uri?eid=2-s2....
Graham, Ryan B, Michael J Agnew, and Joan M Stevenson. 2009. 'Effectiveness of an on-body lifting aid at reducing low back physical demands during an automotive assembly task: Assessment of EMG response and user acceptability', Applied Ergonomics, 40: 936-42. https://doi.org/10.1016/j.apergo.2009.01.006
H Rahimifard, H, N Hashemi Nejad, AR Choobineh, HR Heidari, and HR Tabatabaei. 2010. 'Evaluation of musculoskeletal disorders risk factors in painting workshops of furniture industry', Qom University of Medical Sciences Journal, 4: 45-54. http://journal.muq.ac.ir/article-1-56-en.html
Hess, Jennifer A, Laurel Kincl, Tal Amasay, and Peter Wolfe. 2010. 'Ergonomic evaluation of masons laying concrete masonry units and autoclaved aerated concrete', Applied Ergonomics, 41: 477-83. https://doi.org/10.1016/j.apergo.2009.10.003
Kim, Eun-A, and Seong-Kyu Kang. 2013. 'Historical review of the List of Occupational Diseases recommended by the International Labour organization (ILO)', Annals of occupational and environmental medicine, 25: 14. https://doi.org/10.1186/2052-4374-25-14
Kohammadi, Hamed Yar, Younes Sohrabi, Mohsen Poursadeghiyan, Reza Rostami, Adel Rahmani Tabar, Diyar Abdollahzadeh, and Farshad Rahmani Tabar. 2016. 'Comparing the posture assessments based on RULA and QEC methods in a carpentry workshop', Research Journal of Medical Sciences, 10: 80-3.
Kudo, Naoki, Yoji Yamada, and Daisuke Ito. 2019. 'Age-related injury risk curves for the lumbar spine for use in low-back-pain prevention in manual handling tasks', ROBOMECH Journal, 6: 12. https://doi.org/10.1186/s40648-019-0139-9
Marras, William S, and Waldemar Karwowski. 2006. Fundamentals and assessment tools for occupational ergonomics (Crc Press).
Mazlomi, A, A Kheikhmoghadam, S Tabatabaei, and H Mokhtarinia. 2011. 'Ergonomic evaluation of causes of low back pain using digital human modeling(DHM) in one of the Automotive industries', Journal of Health and Safety at Work, 1(1): 32- 38. DOI: 10.4172/2169-0316.1000186
Merryweather, Andrew S, Manndi C Loertscher, and Donald S Bloswick. 2009. 'A revised back compressive force estimation model for ergonomic evaluation of lifting tasks', Work, 34: 263-72. DOI: 10.3233/WOR-2009-0924
Miguez, SA, MS Hallbeck, and P Vink. 2012. 'Participatory ergonomics and new work: reducing neck complaints in assembling', Work, 41: 5108-13. DOI: 10.3233/WOR-2012-0802-5108
Mirmohammadi, Sayed Taghi, Ali Gholizadeh Abbasabad, Seyed Nourddin Mousavinasab, Seyed Esmaeil Hosseininejad, and Homira Alizadeh. 2019. 'Ergonomic Evaluation of the Manual Material Handling Tasks in the Food Industries of Malard County Using the 3D" Static Strength Prediction Program" and the Key Indicator Method (KIM)', مجله بهداشت و توسعه, 8: 175-86.
MIRMOHAMMADI, Sayedtaghi, Ali GHOLIZADEH ABBASABAD, Seyednourddin MOUSAVINASAB, Seyed Esmaeil HOSSEINI NEJAD, and Homira ALIZADEH. 2018. 'Forces Loaded on the Back of Manual Material Handling Tasks' Workers of Food Industries in Malard Using" 3D Static Strength Prediction Program”', Occupational Hygiene and Health Promotion Journal, 2: 168-77.
Parno, Ayob, Korosh Sayehmiri, Keykaous Azrah, Mohammad Hossein Ebrahimi, and Mohsen Poursadeghiyan. 2016. 'The prevalence of work-related musculoskeletal disorders in the lower limbs among Iranian workers: A meta-analysis study', Iran occupational health, 13: 50-59. http://www.goums.ac.ir/journal
Parno, Ayub, Mohsen Poursadeghiyan, Leila Omidi, Mohsen Parno, Kourosh Sayehmiri, and Fatemeh Sayehmiri. 2016. 'The Prevalence of Work-Related Musculoskeletal Disorders in the upper Extremity: A SystematicReview and Meta-Analysis', Safety Promotion and Injury Prevention, 4: 9-18.
Pirposhteh, Elham Akhlaghi, Ali Karim, and Ali Salehi Sahl Abadi. 2019. 'Evaluation the Prevalence of Musculoskeletal Disorders Among the Medical Staff of Selected hospitals of Shahid Beheshti University of Medical Sciences in 2018', Safety Promotion and Injury Prevention, 7: 69-77.
Plamondon, André, Christian Larivière, Alain Delisle, Denys Denis, and Denis Gagnon. 2012. 'Relative importance of expertise, lifting height and weight lifted on posture and lumbar external loading during a transfer task in manual material handling', Ergonomics, 55: 87-102. https://doi.org/10.1080/00140139.2011.634031

Steele, Emily, Andrea Bialocerkowski, and Karen Grimmer. 2003. 'The postural effects of load carriage on young people–a systematic review', BMC Musculoskeletal disorders, 4: 12. https://doi.org/10.1186/1471-2474-4-12
Torkaman, J, M Motamedzadeh, S Gh Attari, and Gh Roshanaei. 2017. 'Assessment of compressive force on back of hamadan building construction workers during manual load handling by utah method in 2015: a short report', Journal of Rafsanjan University of Medical Sciences, 16: 797-804. http://journal.rums.ac.ir/article-1-3602-en.html
Waters, Thomas R, Vern Putz-Anderson, Arun Garg, and Lawrence J Fine. 1993. 'Revised NIOSH equation for the design and evaluation of manual lifting tasks', Ergonomics, 36: 749-76. https://doi.org/10.1080/00140139308967940
IssueVol 13 No 1 (2021) QRcode
SectionOriginal Article(s)
Manual load handling Cornell questionnaire (CMDQ) Low back pain 3DSSPP software Block maker industries Compressive and shear forces

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Beyrami S, Salehi Sahlabadi A, Talebolhagh S, Ramezanifar S, Moutab Sahihazar Z. Evaluation of Compressive and Shear Forces Exerted on the Lower Back in Manual Load Handling Tasks in Young Workers of Selected Block Maker Using 3DSSPP. Int J Occup Hyg. 2021;13(1):xxx-xxx.