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The effects of load magnitude and lifting speed on the kinematic data of load and human posture

Lee T. H.

International Journal of Occupational Safety and Ergonomics

2015

Vol. 21, No. 1

55--61

This study examined the effects of load magnitude and lifting speed on the kinematic data of load and human posture in a lifting task. Three load magnitudes (10, 20 and 30 kg) and three lifting speeds (fast, normal and slow) were examined in this study. This study showed that participants shortened the load acceleration period on lifting a lighter load than on lifting a heavier load. For normal and slow lifting speeds, participants moved and lifted the load closer to their body when lifting a heavy load. Participants tended to maintain their postures by using an ankle strategy when in heavier load or faster lifting conditions. The profiles of angle velocity of knee and ankle joints demonstrated the important role of the lower extremities in the acceleration of the load in the initial stage of fast lifting. In addition, participants could not easily control the momentum transmitted to the ankle joint for lifting the heavy load.

Assessment of biomechanical risk at work: practical approaches and tools

Cocca P., Marciano F., Rossi D.

Acta of Bioengineering and Biomechanics

2008

Vol. 10, nr 3

21-27

The paper illustrates some methods and tools supporting work-related risk assessment with reference to ergonomics and biomechanics, in particular. These aspects will also be described through the analysis of two case studies in order to highlight the main characteristics and problems found during the application phase. Furthermore, using modelling and simulation software, the utility and reliability of such tools in support of the work-related risk assessment will also be evaluated.

Three-Dimensional Lifting Model For Non-Homogeneous Loads

Gilad I., Boughanim D.

International Journal of Occupational Safety and Ergonomics

2002

Vol. 8, No. 4

511--524

A 3-dimensional model and analysis methodology is suggested for treating lifting tasks when unbalanced loads are involved. The paper describes the biomechanical equations that are coupled with the worker’s posture geometry, to address a practical problem of non-symmetric lifting. The analysis has a dominant biomechanical modeling scope, as it contains a breakdown of the internal lifting forces resulting from posture and external loads acting on the body. The load model represents the acting forces due to unbalanced lifting, which is commonly found in industrial situations. The suggested model allows the user to simulate the influence of the practical load distribution, aiding safe design of a lifting job.