Inertial motion capture-based estimation of L5/S1 moments during manual materials handling

Type de document

Études primaires

Année de publication

2022

Langue

Anglais

Titre de la revue

Sensors

Résumé

Inertial motion capture (IMC) has gained popularity in conducting ergonomic studies in the workplace. Because of the need to measure contact forces, most of these in situ studies are limited to a kinematic analysis, such as posture or working technique analysis. This paper aims to develop and evaluate an IMC-based approach to estimate back loading during manual material handling (MMH) tasks. During various representative workplace MMH tasks performed by nine participants, this approach was evaluated by comparing the results with the ones computed from optical motion capture and a large force platform. Root mean square errors of 21 Nm and 15 Nm were obtained for flexion and asymmetric L5/S1 moments, respectively. Excellent correlations were found between both computations on indicators based on L5/S1 peak and cumulative flexion moments, while lower correlations were found on indicators based on asymmetric moments. Since no force measurement or load kinematics measurement is needed, this study shows the potential of using only the handler’s kinematics measured by IMC to estimate kinetics variables. The assessment of workplace physical exposure, including L5/S1 moments, will allow more complete ergonomics evaluation and will improve the ecological validity compared to laboratory studies, where the situations are often simplified and standardized.

Mots-clés

Manutention manuelle, Manual handling, Mesure du travail et de l'effort, Measurement of work and effort, Mécanique humaine, Body mechanics, Soulèvement des charges, Manual lifting, Instrument de mesure, Measuring instrument, Technique d'échantillonnage, Sampling method, Évaluation de l'exposition, Exposure evaluation

Numéro de projet IRSST

2017-0019

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