Effects of height and load weight on shoulder muscle work during overhead lifting task

Type de document

Études primaires

Année de publication

2015

Langue

Anglais

Titre de la revue

Ergonomics

Première page

748

Dernière page

761

Résumé

Few musculoskeletal models are available to assess shoulder deeper muscle demand during overhead lifting tasks. Our objective was to implement a musculoskeletal model to assess the effect of lifting height and load on shoulder muscle work. A musculoskeletal model scaled from 15 male subjects was used to calculate shoulder muscle work during six lifting tasks. Boxes containing three different loads (6, 12 and 18 kg) were lifted by the subjects from the waist to shoulder or eye level. After optimisation of the maximal isometric force of the model's muscles, the bio-fidelity of the model was improved by 19%. The latter was able to reproduce the subjects’ lifting movements. Mechanical work of the rotator cuff muscles, upper trapezius and anterior deltoid was increased with lifting load and height augmentation. In conclusion, the use of a musculoskeletal model validated by electromyography enabled to evaluate the muscle demand of deep muscles during lifting tasks.

Mots-clés

Épaule, Shoulder, Soulèvement des charges, Manual lifting, Poids maximal des charges à porter, Maximum acceptable weight of lift, Appareil locomoteur, Musculoskeletal system, Force musculaire, Muscular strength

Numéro de projet IRSST

2010-0024

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