Examining human perception of weight during loaded standing and walking

2021 ◽  
Vol 65 (1) ◽  
pp. 101-105
Author(s):  
Ken Chen ◽  
Karen B. Chen ◽  
Edward P. Fitts
Keyword(s):  
Material Handling ◽  
Subjective Evaluation ◽  
Weight Perception ◽  
Weight Ratio ◽  
Human Perception ◽  
Logistic Regression Models ◽  
Manual Material Handling ◽  
Weight Level ◽  
Therapeutic Exercises ◽  
Reference Weight

While the psychophysics of weight perception may help assess the effort needed in manual material handling tasks, the perception of weight is subjective and not necessarily accurate. The purpose of this study was to examine weight perception during standing and walking. Participants (n=10) performed a series of weight comparison trials against a reference load while holding loads (standing) or carrying loads (walking). Polynomial logistic regression models were built to examine the effects of walking, box weight ratio, and reference weight level on the probability of detecting a weight difference. The results showed that weight ratio and reference weight level had statistically significant effects on the detection probability while walking did not have a significant effect. Findings from this study can help inform the design of subjective evaluation of job demands involving motion, and it can be further extended to the gradual increase in load of strengthening tasks in therapeutic exercises.

Task parameters affecting human physical ability and willingness to lift: An ecological approach

2003 ◽  
Vol 3 (2) ◽  
pp. 109-119
Author(s):  
Waldemar Karwowski ◽  
Krystyna Gielo-Perczak ◽  
David Moxley ◽  
David Rodrick
Keyword(s):  
Material Handling ◽  
Open Space ◽  
Human Perception ◽  
Ecological Approach ◽  
Confined Space ◽  
Physical Ability ◽  
Black Boxes ◽  
Average Maximum ◽  
Task Parameters ◽  
Ability And Willingness

The objective of this study was to analyze human perception of load heaviness in manual material handling tasks under varying task parameters taking into consideration participants' physical ability and willingness to lift loads. These conditions were: 1) box color, 2) instruction set, and 3) space confinement. The effect of each parameter on the maximum acceptable weight that people are willing to lift was investigated. This study showed that the box color significantly affects a participant's perception of weight. The average maximum acceptable weight participants were willing to lift was higher for the black boxes than for the white boxes in both open and constrained spaces. When using the white boxes, the maximum acceptable weight participants were willing to lift was smaller in the confined space than in the open space. This study introduces an ecological approach to manual handling tasks and proposes the paradigm of maximum acceptable weight of load (MAWL) to the maximum loads that people perceive they are able and willing to lift (MLWL).

scholarly journals HUBUNGAN BEBAN KERJA FISIK DENGAN KELUHAN MUSKULOSKELETAL PADA PERAWAT DI RUANG LELY 1 DAN 2 RSUD BULELENG

2020 ◽  
Vol 8 (4) ◽  
pp. 440
Author(s):  
Luh Dea Pratiwi ◽  
I Kadek Saputra ◽  
Meril Valentine Manangkot
Keyword(s):  
Material Handling ◽  
Pulse Method ◽  
Cross Sectional ◽  
Probability Sampling ◽  
Manual Material Handling ◽  
Body Map

Perawat merupakan profesi tenaga kesehatan terbanyak di rumah sakit yang harus menangani dan merawat pasien selama 24 jam dan melakukan asuhan keperawatan yang menerapkan tindakan manual material handling. Manual material handling berisiko menimbulkan beban kerja fisik yang ditandai dengan adanya nyeri di daerah otot yang disebut dengan keluhan muskuloskeletal. Tujuan penelitian ini adalah untuk mengetahui hubungan beban kerja fisik dengan keluhan muskuloskeletal pada perawat di ruang Lely 1 dan 2 RSUD Buleleng. Penelitian ini merupakan deskriptif korelasional dengan rancangan penelitian cross sectional. Sampel dalam penelitian ini berjumlah 25 responden yang dipilih dengan metode probability sampling yaitu total sampling. Instrumen penelitian yang digunakan dalam penelitian ini yaitu cardiovascular load dengan menggunakan ten pulse method dan Nordic Body Map. Hubungan beban kerja fisik dengan keluhan muskuloskeletal pada perawat dianalisis menggunakan Pearson Product Moment karena data berdistribusi normal. Hasil penelitian menunjukkan bahwa sebagian besar responden memiliki beban kerja fisik katagori sangat ringan (84%) dan keluhan muskuloskeletal kategori rendah (84%). Uji Pearson Product Moment menunjukkan adanya hasil yang signifikan dengan nilai p yaitu 0,000, r=0,806. Kesimpulan dalam penelitian ini yaitu ada hubungan yang positif antara beban kerja fisik dengan keluhan muskuloskeletal pada perawat di ruang Lely 1 dan 2 RSUD Buleleng. Berdasarkan hasil penelitian, disarankan untuk menerapkan sikap ergonomis sesuai prosedur dalam memberikan asuhan keperawatan.  

scholarly journals System Dynamics Model Application for Ergonomic Assessment of Manual Material Handling Tasks

2016 ◽  
Author(s):  
Hossein Abaeian ◽  
Osama Moselhi ◽  
Mohamad Al-Hussein
Keyword(s):  
System Dynamics ◽  
Material Handling ◽  
Dynamic Equilibrium ◽  
Project Managers ◽  
Dynamics Modeling ◽  
Work Related ◽  
Manual Material Handling ◽  
Compressive Loads ◽  
Levels Of Automation ◽  
Free Body

Despite increased levels of automation in manufacturing occupations in recent years, many activities are still performed through human intervention and involve Manual Material Handling (MMH), thus exposing workers to stress due to over-exertion and potential Work-Related Musculoskeletal Disorders (WRMSDs). An early ergonomic and physical demand assessment of work activities is critical to reducing exposure to risk and to maintaining desired levels of productivity. Biomechanics consists of applying concepts of static and dynamic equilibrium to different parts of the human musculoskeletal system using free-body diagrams to estimate muscle force and loads generated across the joints and tissues. System dynamics is a powerful tool applied in resolving complex problems with different influencing variables. This technique can help designers and managers to understand, evaluate and simulate the factors causing problems in the system. This paper presents the application of System Dynamics modeling to assess the biomechanical risks associated with manual material handling tasks. The case study presents predicted cumulative biomechanical compressive loads from material handling task and can assist project managers to understand and reduce exposure to ergonomic risks in the workplace.

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