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Kinematic and electromyographic assessment of manual handling on a supermarket green- grocery shelf

Subtitle:

Article type: Research Article

Authors: Silvetti, Alessioa | Mari, Silviab | Ranavolo, Albertoa | Forzano, Federicoa | Iavicoli, Sergioa | Conte, Carmelac | Draicchio, Francescoa; *

Affiliations: [a] INAIL - Department of Occupational Medicine, Rome, Italy | [b] Fondazione Don Gnocchi, Milan, Italy | [c] Department of Neuroscience, University of Pavia, Pavia, Italy

Correspondence: [*] Corresponding author: Francesco Draicchio, INAIL - Department of Occupational Medicine, Via Fontana Candida 1, Monte Porzio Catone, Rome, 00040, Italy. Tel.: +39 0694181373; Fax: +39 0694181410; E-mail:f.draicchio@inail.it

Keywords: Retail sector, ergonomics, movement analysis, shelf levels, NIOSH protocol

DOI: 10.3233/WOR-141900

Journal: Work, vol. 51, no. 2, pp. 261-271, 2015

Received 10 January 2013
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Accepted 8 January 2014
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Published: 2015
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Abstract

BACKGROUND: There are few epidemiological data regarding musculoskeletal disorders (MSDs) in retail industry. Biomechanical risk assessment in ergonomics is commonly performed in retail sector using standardized protocols. However, such protocols have numerous limitations, such as the lack of objectivity or applicability and restrictive conditions.

OBJECTIVE: The aim of this study was to analyze one of the most commonly used shelves in vegetable and fruit departments in order to investigate the effect of different shelf levels (i.e. with variations in height and horizontal distance) and load weights on the workers' biomechanical load.

METHODS: We investigated trunk, shoulder, elbow, hip, knee and ankle joint ROMs, as well as the mean and peak EMG values of the upper limb, trunk and lower limb muscles.

RESULTS: We found that shelf level has a significant effect on most of the parameters examined, whereas within this limited range of 6 and 8 kg, weight does not affect the biomechanical load. We also identified the shelf levels that place the least and most strain on the musculoskeletal system.

CONCLUSIONS: We therefore recommend that the height and horizontal distance be carefully considered when shelves are being designed. Kinematic and EMG approach may help to objectively assess shelf-related risks. Our findings are in agreement with RNLE LI values and therefore support RNLE.

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