scholarly journals Trunk kinematic variability as a function of time during the early phase of a repetitive lifting task

2021 ◽  
Vol 31 (3) ◽  
pp. 291-299
Author(s):  
Emmanuel Tetteh ◽  
Gary A. Mirka
Keyword(s):  
Early Phase ◽  
Repetitive Lifting ◽  
Lifting Task

scholarly journals Modelling the Additivity of Perceived Exertion in Symmetric, Mid-Sagittal Lifting

1994 ◽  
Vol 38 (10) ◽  
pp. 621-625 ◽  
Author(s):  
Brian D. Lowe
Keyword(s):  
Perceived Exertion ◽  
Linear Regression Analysis ◽  
Multiple Linear Regression Analysis ◽  
Whole Body ◽  
Coefficient Of Determination ◽  
Perceived Effort ◽  
Repetitive Lifting ◽  
The Relationship ◽  
Whole Body Exertion ◽  
Lifting Task

Psychophysical approaches to quantifying perceived effort have been used to evaluate the physical demand of many industrial work activities. An experiment was conducted to examine the relationship between ratings of whole-body perceived exertion and differentiated, regional ratings of exertion. The Borg, CR-10 scale was used by 16 subjects performing a simulated repetitive lifting task. Ratings of perceived exertion were obtained for the arms, legs, torso, and central (cardiorespiratory) effort sensations as well as a rating of overall, whole-body exertion. A multiple linear regression analysis was used to predict the whole-body rating of exertion from the differentiated ratings in lifting tasks using both a squat and stoop posture. In the stoop posture condition the coefficient of determination between whole-body perceived exertion and the model including arm, torso, and central ratings was R2=0.81. In the squat posture condition, the final regression model predicting whole-body exertion contained only the rating from the legs (R2 = 0.62). Differentiated ratings explained the majority of the variance in whole-body perceived exertion for squat and stoop lifting tasks.

scholarly journals Influencing lumbar posture through real-time biofeedback and its effects on the kinematics and kinetics of a repetitive lifting task

2019 ◽  
Vol 73 ◽  
pp. 93-100 ◽  
Author(s):  
Mark Boocock ◽  
Yanto Naudé ◽  
Steve Taylor ◽  
Jeff Kilby ◽  
Grant Mawston
Keyword(s):  
Real Time ◽  
Repetitive Lifting ◽  
Lifting Task ◽  
Kinetics Of ◽  
Kinematics And Kinetics

Effect of Prior Mental or Physical Fatigue on the Biomechanical Response During a Lifting Task

2016 ◽  
Vol 60 (1) ◽  
pp. 997-998
Author(s):  
Susan E. Kotowski ◽  
Joseph Niehaus ◽  
Alyssa Ofat ◽  
Michael Presnell ◽  
Alena Regelski ◽  
...  
Keyword(s):  
Muscle Activity ◽  
Muscle Activation ◽  
Perceived Exertion ◽  
Rating Of Perceived Exertion ◽  
Physical Fatigue ◽  
Repetitive Lifting ◽  
Biomechanical Response ◽  
Activation Data ◽  
Study Participants ◽  
Lifting Task

Repetitive lifting is a requirement in many occupations and often leads to prevalent and costly back injuries. What is unknown is how fatigue, whether mental or physical, occurring before the primary lifting task impacts the biomechanical response during the task. Study participants completed three lifting tasks with prior mental fatigue (Stroop test), prior physical fatigue (running on a treadmill), or no prior fatigue. Electromyography (EMG) was used to measure muscle activity and fatigue, and Borg’s Rating of Perceived Exertion (RPE) was also assessed. Muscle activation data and RPE data indicated that both prior mental and physical fatigue increases muscle activation and perceived exertion.

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.

Comparison of Three Training Programs for Improving Repetitive Lifting Task Performance in Women

2006 ◽  
Vol 38 (Supplement) ◽  
pp. S455 ◽  
Author(s):  
Marilyn A. Sharp ◽  
Diane M. Pietila ◽  
Joseph A. Alemany ◽  
Kevin R. Rarick ◽  
Jeffery S. Staab ◽  
...  
Keyword(s):  
Task Performance ◽  
Training Programs ◽  
Repetitive Lifting ◽  
Lifting Task

Inter-individual variability in a repetitive lifting task

2021 ◽  
Vol 65 (1) ◽  
pp. 833-837
Author(s):  
Emmanuel Tetteh ◽  
Pramiti Sarker ◽  
Colten Fales ◽  
Jeff Mettler ◽  
Gary Mirka
Keyword(s):  
Range Of Motion ◽  
Injury Risk ◽  
Transverse Velocity ◽  
Individual Variability ◽  
Low Back ◽  
Repetitive Lifting ◽  
Biomechanical Loading ◽  
Homogeneity Of Variance ◽  
Trunk Kinematics ◽  
Lifting Task

Trunk kinematics directly impact the biomechanical loading of the tissues of the low back. Quantifying the variability in trunk kinematics may provide deeper insights into biomechanical loading and low back injury risk. Inter-lifter variability in trunk kinematics was assessed as twenty participants performed a repetitive lifting task at three levels of the NIOSH Lifting Index. Trunk kinematics were captured and Levene’s test of homogeneity of variance was used to test the hypothesis that variance in kinematic parameters increased as a function of level of lifting index. Results showed considerable levels of variability in all kinematics parameters, and for sagittal range of motion, mean sagittal velocity, transverse range of motion, and mean transverse velocity the variance was significantly affected (p<0.05) by level of lifting index. The results of this study demonstrate that variability (both inter- and intra-lifter) should be considered as one considers the relative risk of a lifting task.

Effect of an on-body ergonomic aid on oxygen consumption during a repetitive lifting task

2014 ◽  
Vol 44 (1) ◽  
pp. 39-44 ◽  
Author(s):  
Brett H. Whitfield ◽  
Patrick A. Costigan ◽  
Joan M. Stevenson ◽  
Catherine L. Smallman
Keyword(s):  
Oxygen Consumption ◽  
Repetitive Lifting ◽  
Lifting Task

Repetitive Lifting Tasks in Logistics – Effects on Humans at Different Lifting Task Durations

2016 ◽  
Vol 60 (1) ◽  
pp. 2034-2038 ◽  
Author(s):  
Verena C. Knott ◽  
Alexander Wiest ◽  
Klaus Bengler
Keyword(s):  
Cardiopulmonary Exercise Testing ◽  
Cardiovascular Effects ◽  
Objective Data ◽  
Subjective Data ◽  
Cardiopulmonary Exercise ◽  
Repetitive Lifting ◽  
Volunteer Study ◽  
Task Durations ◽  
Manual Handling ◽  
Lifting Task

A volunteer study at the Chair of Ergonomics (TUM) investigates which cardiovascular effects on the human body are to be expected from repetitive lifting movements at different load times, and which requirements arise accordingly with respect to different lifting task durations by using the cardiopulmonary exercise testing (CPET) method. Two different weight classes and three different load times are combined with a conventional lifting task. In addition to the acquisition of objective data, such as oxygen consumption (V’O2/kg) or heart rate (HR), the subjective stress using the Borg RPE scale is determined and analyzed. 27 test persons (M=27.6 years, SD=±3.1) participated in the study. At 70.4% less than three quarter of the participants in the test were men. Both the objective and subjective data show significant differences between the mentioned weight classes. A load time of more than 10 minutes for analyzing manual handling tasks by using CPET is recommended.

Interjoint Coordination and the Personal Lift-Assist Device

2013 ◽  
Vol 29 (2) ◽  
pp. 194-204 ◽  
Author(s):  
Ryan B. Graham ◽  
Catherine L.W. Smallman ◽  
Erin M. Sadler ◽  
Joan M. Stevenson
Keyword(s):  
Lumbar Spine ◽  
Principal Component ◽  
Assist Device ◽  
Joint Stress ◽  
Interjoint Coordination ◽  
Repetitive Lifting ◽  
Lift Assist ◽  
Coordination Patterns ◽  
Main Effects ◽  
Lifting Task

It has been suggested that interjoint coordination may serve to reduce joint stress and muscular demand and to maintain balance during dynamic lifting tasks, thus having implications for safe lifting practices. Before recommending the use of an on-body ergonomic aid, the Personal Lift-Assist Device (PLAD), it is important to determine any effects this device may have on interjoint coordination. Principal component analyses were applied to relative phase angle waveforms, defining the hip–knee and lumbar spine–hip coordination of 15 males and 15 females during a repetitive lifting task. When wearing the PLAD, users lifted with more synchronous hip–knee and lumbar spine–hip coordination patterns (P< .01). Furthermore, increases in load caused less synchronized interjoint coordination at both the hip–knee and lumbar spine–hip during the up and down phases of the lift (P< .01) for all conditions. No significant main effects of sex or significant interactions were observed on any of the outcome variables.

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