Field measurement of hand forces of palm oil harvesters and evaluating the risk of work-related musculoskeletal disorders (WMSDs) through biomechanical analysis

Abdullah, Nurhayati; Nordin, Margareta; Ripin, Zaidi Mohd

doi:10.1016/j.ergon.2023.103468

Cited by 7 publications

(1 citation statement)

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“…However, small loads generate 2 of 22 AF during repetitive movements at a high frequency [2]. This means prolonged exposure to AF can result in high muscular loads, which is considered an ergonomic hazard (EH) [5][6][7][8]. Work-related musculoskeletal disorders (WMSDs) are injuries in muscles, tendons, joints, and nerves due to EHs.…”

Section: Introductionmentioning

confidence: 99%

Triaxial Load Cell for Ergonomic Risk Assessment: A Study Case of Applied Force of Thumb

Acosta-Flores,

Contreras-Valenzuela,

Velásquez-Aguilar

et al. 2024

Applied Sciences

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To assess the ergonomic risk level in work systems involving tasks performed with hands or fingers, it is necessary to know the exerted triaxial forces. To address this need, a prototype of a triaxial load cell based on principles of linear elasticity theory and mechanical problems of torsion, bending and axial load is presented. This work includes an analytical strain model for each instrumented point and its solution regarding the applied force to a triaxial load cell. The proposed load cell was calibrated and validated by performing different static experimental tests. As a case study, the applied force in three directions while the thumb activates a cigarette lighter was measured. Triaxial forces and resultant forces were obtained and compared with the parameter of 10 N established by the ergonomic standards as reference values for pressing down with the thumb, finding that the applied forces in eight tests were 23.73 N, 43.51 N, 12.69 N, 14.50 N 20.35 N, 21.67 N, 39.74 N and 46.02 N, exceeding the reference values and establishing a direct relationship with Quervain syndrome. In conclusion, the developed load cell is a valid and reliable alternative to measure many forces that cannot be obtained with commercial devices, allowing the level of ergonomic risk to be determined with great precision.

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Section: Introductionmentioning

confidence: 99%