scholarly journals THE EFFECT OF TRANSFER DISTANCE TO LOWER BACK TWISTING AND BENDING PATTERNS IN MANUAL TRANSFER TASK

2021 ◽  
Vol 83 (2) ◽  
pp. 125-133
Author(s):  
Radin Zaid Radin Umar ◽  
Muhammad Naqiuddin Khafiz ◽  
Nazreen Abdullasim ◽  
Fatin Ayuni Mohd Azli Lee ◽  
Nadiah Ahmad
Keyword(s):  
Material Handling ◽  
Calculated Data ◽  
Transfer Task ◽  
Transfer Activity ◽  
Transfer Distance ◽  
Lower Back ◽  
Working Posture ◽  
Mechanical Devices ◽  
Twisting Angle ◽  
Forceful Exertion

Manual material handling (MMH) activities utilize human’s effort with minimal aid from mechanical devices. MMH is typically associated with poor lower back posture which can lead to lower back injury. The likelihood to develop musculoskeletal disorders (MSDs) increases when poor working posture exist in combination with repetition and/or forceful exertion. In manual transfer activity, the distance between lifting origin and destination could affect workers’ exposure on poor lower back working posture. An experimental study was conducted to investigate the effect of transfer distance to lower back twisting and bending pattern in manual transfer activity. Positional body joints data of 26 male subjects were captured using the combination of motion capture (MOCAP) system with MVN studio software. Calculated data were plotted against time to track subjects’ lower back twisting and bending behavior. In general, longer the transfer distance would result in smaller twisting angle but higher bending angle. Statistical analysis in this study suggests 0.75m to 1.00m as the optimum transfer distance to balance lower back twisting and bending exposure on workers. This study is envisioned to provide insights for practitioners to consider space requirements for MMH activity to minimize lower back twisting and bending, and consequently the development of MSDs.

scholarly journals SPACE MAPPING OF HIP AND WRISTS MOTIONS FOR DIFFERENT TRANSFER DISTANCES IN MANUAL MATERIAL HANDLING TASK

2020 ◽  
Vol 21 (2) ◽  
pp. 164-176
Author(s):  
Radin Zaid Radin Umar ◽  
Fatin Ayuni Mohd Azli Lee ◽  
Muhammad Naqiuddin Khafiz ◽  
Nadiah Ahmad ◽  
Nazreen Abdullasim
Keyword(s):  
Material Handling ◽  
Space Mapping ◽  
Material Transfer ◽  
Repetitive Lifting ◽  
Manual Material Handling ◽  
Lower Back ◽  
Occupational Settings ◽  
Lifting Task ◽  
Transfer Tasks ◽  
Male Subjects

Manual material transfer tasks are common in occupational settings. Repetitive lifting tasks usually involve twisting and bending which are associated with occupational lower back injuries. One of the approaches to reduce bending and twisting is to separate the distance between lifting origin and destination, which will encourage lifters to step and turn entire bodies. However, adding lifting distances is likely to affect space usages and requirements. A study was conducted to investigate how the transfer distances influence space usage during the lifting task. Raw data of hip and hand wrists motion of 26 male subjects during transfer in 4 different distances were captured using X-Sens motion capture system. MVN Studio software was used to process and extract positional data. Tabulated space mapping revealed limited hip movement and semicircular shaped hand motions for short transfer distances. The pattern changes into a more stretched-curve shape as the distance increases. Overall, it was observed that shorter transfer distance caused participants to adopt more twisting and less bending postures, while further transfer distances resulted in more bending and less twisting. This study may provide industrial practitioners with information to design a space requirement for manual material transfer tasks. ABSTRAK: Kerja-kerja pemindahan barang secara manual adalah biasa dalam persekitaran kerja. Kerja-kerja mengangkat barang yang kebiasaannya melibatkan badan membengkok dan berpusing boleh menyebabkan kecederaan tulang belakang. Salah satu cara bagi mengurangkan risiko ini adalah dengan memisahkan jarak antara tempat asal dan tempat tuju pemindahan barang. Pemindah barang digalakkan untuk melangkah dan memusingkan seluruh badan. Namun, cara ini menyebabkan penggunaan ruang yang banyak. Satu kajian telah dijalankan bagi mengkaji bagaimana jarak pemindahan barang mempengaruhi penggunaan ruang ketika kerja-kerja pemindahan. Data asal pergerakan pinggul dan pergelangan tangan daripada 26 subjek lelaki ketika pemindahan barang pada 4 jarak berbeza diperolehi menggunakan sistem rakaman gerakan X-Sens. Perisian MVN Studio digunakan bagi memproses dan mengekstrak data ini. Ruang pemetaan berjadual mendedahkan pergerakan pinggul yang terhad dan pergerakan tangan berbentuk separa bulat pada jarak pemindahan terdekat. Corak ini berubah kepada bentuk lengkung memanjang apabila jarak bertambah. Keseluruhannya, jarak pindahan yang kurang menyebabkan para peserta lebih terdedah kepada postur memusingkan badan berbanding membengkok, sementara jarak yang jauh menyebabkan peserta lebih membengkok berbanding memusingkan badan. Kajian ini memberikan maklumat untuk penggiat industri mereka cipta keperluan ruang bagi kerja-kerja pemindahan barang secara manual.

scholarly journals Reviewing interventions to enhance comfort and productivity of workers in Enterprises

2020 ◽  
Vol 15 (2) ◽  
pp. 419-423
Author(s):  
Ekta Melkani ◽  
Kiran Singh ◽  
Manju Mehta
Keyword(s):  
Musculoskeletal Disorders ◽  
Material Handling ◽  
Small Scale ◽  
Upper Limbs ◽  
Manual Material Handling ◽  
Lower Back ◽  
Ergonomic Interventions

The following study deals with the detailed reviews regarding the interventions that have been done globally in the sector of entrepreneurial interventions in aspect of work simplification. Various standards hence can be considered while referring to different designs for enterprises, especially small scale enterprises. The studies have revealed the musculoskeletal disorders from manual material handling (MMH) works often involving strains and sprains to the lower back, shoulders, and upper limbs. The ergonomic interventions are found to give comfort to the workers in various postures. It is concluded that the design of the system must be incorporating to the worker, equipment, and environment as a whole.

scholarly journals Working posture analysis of sweet whey powder handling at CV Cita Nasional warehouse using OVAKO Working Posture Analysis (OWAS)

2018 ◽  
Vol 49 ◽  
pp. 02013
Author(s):  
Manik Mahachandra ◽  
Heru Prastawa ◽  
Dhialma Yonathan Susilo
Keyword(s):  
Musculoskeletal Disorders ◽  
Material Handling ◽  
Posture Analysis ◽  
Whey Powder ◽  
Central Java ◽  
Applied Study ◽  
Working Posture ◽  
Sweet Whey ◽  
Analysis System ◽  
Sweet Whey Powder

In this 4.0 industrial era, some material handlings are still conducted manually by human. One example is in the warehouse area of CV Cita Nasional, a milk processing factory in Kopeng, Central Java. Workers are repetitively unloading a 25 kg sack of sweet whey powder from truck to warehouse area. Therefore, this study was carried out to investigate the musculoskeletal disorders risks on that workers manual handling activity. The OVAKO Working Posture Analysis System (OWAS) was chosen to be applied in the evaluation steps. For each activity in the unloading process, OWAS score category of 3 (improvements are necessary as soon as possible) were resulted on lifting, 2 (improvements are necessary in the long-term future) on carrying, and 3 on lowering the load. Consequently, a trolley was then designed to minimize the risks. The trolley was designed based on Indonesian anthropometry dimensions. Applying this proposed tool, lifting and lowering activities were then categorized in OWAS score of 2, whilst carrying was resulted in OWAS score of 1 (improvements are not necessary). This applied study was valuable in order to minimize the musculoskeletal disorders risks on such manual material handling activity, not only in the current workplace, but also in similar situation of industries.

scholarly journals Forces Loaded on the Back of Manual Material Handling Tasks' Workers of Food Industries in Malard Using"3D Static Strength Prediction Program”

2018 ◽  
Author(s):  
Sayedtaghi MIRMOHAMMADI ◽  
Ali GHOLIZADEH ABBASABAD ◽  
Seyednourddin MOUSAVINASAB ◽  
Seyed Esmaeil HOSSEINI NEJAD ◽  
Homira ALIZADEH
Keyword(s):  
Musculoskeletal Disorders ◽  
Material Handling ◽  
Physical Workload ◽  
Shear Forces ◽  
Manual Lifting ◽  
Food Industries ◽  
Prediction Program ◽  
Manual Material Handling ◽  
Lower Back

Introduction: Manual Material Handling tasks can cause fatigue in the short term and increase physical workload and musculoskeletal injuries in the long term. The present study was conducted to determine the amount of forces entered to the lower back in workers with manual material handling tasks.Methods: This descriptive-analytic study was conducted on 100 workers in food industries in Malard city in 2017. The Nordic questionnaire was used to determine the frequency of musculoskeletal disorders. The 3DSSPP was also applied to determine the amount of forces entered to the lower back of manual material handling tasks workers. Data analysis was conducted using SPSS (version 23)Results: we found that 24percent of workers had discomfort in at least one of their nine musculoskeletal muscles. The results of 3DSSPP showed that 30 and 34 percent of the compressive forces entered into L5/S1 and L4/L5 discs, respectively. In addition, the shearing force loaded on the L5/S1 disc was also found to be higher than the permissible limit eight percent of the participants. No significant relationship was found between the frequency of musculoskeletal disorders and the amount of compressive and shear forces entered to the lower back of workers.Conclusion: Based on NIOSH  recommended limits, the amount of compressive and shear forces entered to the lower back in 3DSSPP showed that in 30 percent of manual lifting load tasks, the risk of injury to the lower back was moderate and this risk was low in 70 percent of tasks.

scholarly journals Evaluasi Aktivitas Manual Material Handling dan Penerapan K3 Bagian Palletizing Kemasan Jerigen di PT. XYZ

2020 ◽  
Vol 19 (1) ◽  
Author(s):  
Kusnadi Kusnadi ◽  
Aulia Fashanah Hadining ◽  
Wahyudin Wahyudin
Keyword(s):  
Working Conditions ◽  
Material Handling ◽  
Manual Lifting ◽  
Work Attitude ◽  
Manual Material Handling ◽  
Lower Back ◽  
Risk Of Injury ◽  
Work Posture ◽  
Line Section ◽  
Heavy Loads

<span lang="EN">Production results that are handled manually are lifting the burden of jerry cans weighing 24 kg from the conveyor to the pallet. This removal process is risky for musculoceletal and can cause lower back pain. The appointment process takes place in the packing line section D. The purpose of this study is to determine the level of risk, find out the form of conveyor in accordance with working conditions and provide recommendations for corrective actions to be taken when the operator's work attitude has the risk of injury. The assessment of work posture is based on the assessment of RULA for each part (upper arm, forearm, wrist, wrist rotation, back, neck, and leg position) which are then categorized based on the results of the grand score on the action level indicating that the posture is required repair or not. The results of this study found that 3 workers for the grand score of work posture an average of 7 which indicates the need for action now. This is influenced by heavy loads with manual lifting</span>.

Is there a Lateral Transfer Distance that Minimizes Twisting and Lateral Bending Motions of the Spine?

2009 ◽  
Vol 53 (14) ◽  
pp. 882-882 ◽  
Author(s):  
Steven A. Lavender ◽  
Monica Johnson
Keyword(s):  
Transfer Task ◽  
Handling Time ◽  
Separation Distance ◽  
The Body ◽  
Lateral Transfer ◽  
Lateral Bending ◽  
Transfer Distance ◽  
Transport Distance ◽  
Forward Bending ◽  
Asymmetric Lifting

Studies have shown that twisting and lateral bending postures and motions increase the risk of low back disorders in manual handling tasks (Marras et al., 1993; Punnet et al., 1991). These motions are often associated with asymmetric lifting. Thus, it has been hypothesized that one means for controlling these motions is through carefully designing the layout of the workplace. We hypothesized that spatially separating a lift's origin and destination to encourage stepping/turning of the body during a manual transfer task would reduce these motions. At the same time, however, the added distance may increase the tendency to reach, therein increasing the amount of forward bending, increases handling time, and may increase the physiologic cost. Thus, the objective of the current study was to determine if there is a separation distance between a lift's origin and destination during the lateral transfer of boxes that minimizes the lateral bending and twisting motions on the spine while not increasing the amount of forward bending due to reaching. The study was performed by having 29 male volunteers transfer boxes between two conveyors spaced .50, .75, 1.0, 1.25, 1.50, and 1.75 meters apart. Transfers were performed using loads of 9.5 and 16.5 kg. Spine kinematic data were collected with a magnetic motion capture system. The data from the box pick up and the box placement were analyzed separately. The twisting motions associated with the box placement were significantly affected by the transport distance (p=.007). However, the twisting motion when pick up the box, while showing a trend toward less motion with a 1 meter transport distance was not significantly different across the transport distances (p=.15). The lateral bending motions, both during the box pick up and the box placement were significantly affected by the transfer distance (p<.05). Overall our findings suggest twisting and lateral motions would both be minimized when the transfer distances were between 1 and 1.25 meters.

Age related differences in mechanical demands imposed on the lower back by manual material handling tasks

2016 ◽  
Vol 49 (6) ◽  
pp. 896-903 ◽  
Author(s):  
Iman Shojaei ◽  
Milad Vazirian ◽  
Emily Croft ◽  
Maury A. Nussbaum ◽  
Babak Bazrgari
Keyword(s):  
Material Handling ◽  
Manual Material Handling ◽  
Lower Back ◽  
Age Related

scholarly journals Postural Analysis on Manual Pine Resin Collecting Work: Lifting Index and L5/S1 Compression-Shear Forces

2021 ◽  
Vol 9 (3) ◽  
pp. 368-378
Author(s):  
Efi Yuliati Yovi ◽  
Nasruli Awaliyah
Keyword(s):  
Injury Risk ◽  
Material Handling ◽  
Three Dimension ◽  
Shear Forces ◽  
Manual Lifting ◽  
Prediction Program ◽  
Manual Material Handling ◽  
Lower Back ◽  
Psychophysical Analysis ◽  
Postural Analysis

Even though pine oleoresin harvesting is labor-intensive forestry work involving manual material handling (especially lifting) and is massively carried out in Indonesia, there is a lack of ergonomics studies on manual pine oleoresin harvesting. This study focused on lifting-related postures in pine oleoresin harvesting. A Three Dimension Static Strength Prediction Program Version 7.1.0 was used to identify the injury risk on the lower back (lumbosacral joint, L5/S1) using biomechanical criteria (compression and shear forces) at extreme postures. Recommended Weight Limit (RWL) and Lifting Index (LI) were calculated for a comprehensive analysis. The exceeding compression and shear forces indicated that the L5/S1 injury risk on oleoresin collecting work (part of oleoresin harvesting) is high. The psychophysical analysis confirmed the findings, as several main postures in this work were categorized as intense manual lifting due to the excessive score of LI.  A significant reduction in the L5/S1 compression and shear forces were shown at a simulation using a proposed load threshold (using the calculated RWL). Keywords: biomechanics, ergonomics, forestry work, manual lifting, oleoresin harvesting

TO THE QUESTION OF THE EPIDEMIOLOGICAL ASSESSMENT OF OCCUPATIONAL HEALTH RISK FOR THE DEVELOPMENT OF LOWER BACK PAIN SYNDROME

2021 ◽  
Author(s):  
V.A. Shirokov ◽  
◽  
N.L. Terehov ◽  
A.V. Potaturko
Keyword(s):  
Back Pain ◽  
Working Conditions ◽  
Lower Back Pain ◽  
Odds Ratio ◽  
Pain Syndrome ◽  
Epidemiological Survey ◽  
Dynamic Exercise ◽  
Cross Sectional ◽  
Lower Back ◽  
Working Posture

Abstract: The aim of the paper was to study the influence of adverse occupational factors on the prevalence and odds ratio of the development of lower back pain syndrome. A cross-sectional epidemiological survey was performed based on the findings of a periodic medical examination of 2,915 individuals engaged in various working conditions. The greatest adverse effect on the pain syndrome development was caused by a dynamic exercise (OR 5.22 and 95 % of CI – 3.50-7.81), lifting and manual moving of the load (OR 3.01 and 95% of CI -2.41-3.75) as well as an unfavorable working posture (OR 7.10 and 95 % of CI -5.65-8.94).

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