Effects of different lifting and lowering heights on upper arm, shoulder and back muscle activity during a manual material handling task

Work ◽  
2015 ◽  
Vol 53 (1) ◽  
pp. 175-179 ◽  
Author(s):  
In-gyu Yoo ◽  
Won-gyu Yoo
Keyword(s):  
Muscle Activity ◽  
Material Handling ◽  
Back Muscle ◽  
Upper Arm ◽  
Manual Material Handling

scholarly journals Manual material handling in the supermarket sector. Part 1: Joint angles and muscle activity of trapezius descendens and erector spinae longissimus

2021 ◽  
Vol 92 ◽  
pp. 103340
Author(s):  
Sebastian Skals ◽  
Rúni Bláfoss ◽  
Michael Skipper Andersen ◽  
Mark de Zee ◽  
Lars Louis Andersen
Keyword(s):  
Muscle Activity ◽  
Material Handling ◽  
Erector Spinae ◽  
Joint Angles ◽  
Manual Material Handling ◽  
Sector Part

Effects of restrictive clothing on lumbar range of motion and trunk muscle activity in young adult worker manual material handling

2013 ◽  
Vol 44 (6) ◽  
pp. 1024-1032 ◽  
Author(s):  
Wichai Eungpinichpong ◽  
Vitsarut Buttagat ◽  
Pattanasin Areeudomwong ◽  
Noppol Pramodhyakul ◽  
Manida Swangnetr ◽  
...  
Keyword(s):  
Young Adult ◽  
Range Of Motion ◽  
Muscle Activity ◽  
Material Handling ◽  
Trunk Muscle ◽  
Manual Material Handling ◽  
Adult Worker ◽  
Lumbar Range Of Motion

scholarly journals Evaluation of an acceleration-based assistive strategy to control a back-support exoskeleton for manual material handling

2020 ◽  
Vol 1 ◽  
Author(s):  
Maria Lazzaroni ◽  
Ali Tabasi ◽  
Stefano Toxiri ◽  
Darwin G. Caldwell ◽  
Elena De Momi ◽  
...  
Keyword(s):  
Control Strategy ◽  
Material Handling ◽  
Muscle Activation ◽  
Control Strategies ◽  
Angular Acceleration ◽  
Movement Speed ◽  
Compression Force ◽  
Back Muscle ◽  
Manual Material Handling ◽  
New Strategy

Abstract To reduce the incidence of occupational musculoskeletal disorders, back-support exoskeletons are being introduced to assist manual material handling activities. Using a device of this type, this study investigates the effects of a new control strategy that uses the angular acceleration of the user’s trunk to assist during lifting tasks. To validate this new strategy, its effectiveness was experimentally evaluated relative to the condition without the exoskeleton as well as against existing strategies for comparison. Using the exoskeleton during lifting tasks reduced the peak compression force on the L5S1 disc by up to 16%, with all the control strategies. Substantial differences between the control strategies in the reductions of compression force, lumbar moment and back muscle activation were not observed. However, the new control strategy reduced the movement speed less with respect to the existing strategies. Thanks to improved timing in the assistance in relation to the typical dynamics of the target task, the hindrance to typical movements appeared reduced, thereby promoting intuitiveness and comfort.

scholarly journals Back-Support Exoskeleton Control Strategy for Pulling Activities: Design and Preliminary Evaluation

Designs ◽  
2021 ◽  
Vol 5 (3) ◽  
pp. 39
Author(s):  
Maria Lazzaroni ◽  
Tommaso Poliero ◽  
Matteo Sposito ◽  
Stefano Toxiri ◽  
Darwin G. Caldwell ◽  
...  
Keyword(s):  
Control Strategy ◽  
Muscle Activity ◽  
Material Handling ◽  
Ease Of Use ◽  
Biomechanical Analysis ◽  
Perceived Support ◽  
Preliminary Evaluation ◽  
Subjective Measurements ◽  
Spinal Muscles ◽  
Forearm Muscle

The execution of manual material handling activities in the workplace exposes workers to large lumbar loads that increase the risk of musculoskeletal disorders and low back pain. In particular, the redesign of the workplace is making the execution of pulling activities more common, as an alternative to lifting and carrying tasks. The biomechanical analysis of the task revealed a substantial activation of the spinal muscles. This suggests that the user may benefit from the assistance of a back-support exoskeleton that reduces the spinal muscle activity and their contribution to lumbar compression. This work addresses this challenge by exploiting the versatility of an active back-support exoskeleton. A control strategy was specifically designed for assisting pulling that modulates the assistive torques using the forearm muscle activity. These torques are expected to adapt to the user’s assistance needs and the pulled object mass, as forearm muscle activity is considered an indicator of grip strength. We devised laboratory experiments to assess the feasibility and effectiveness of the proposed strategy. We found that, for the majority of the subjects, back muscle activity reductions were associated with the exoskeleton use. Furthermore, subjective measurements reveal advantages in terms of perceived support, comfort, ease of use, and intuitiveness.

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