Myotonometry in machinery operators and its relationship with postural ergonomic risk

Author:

Urrejola-Contreras Gabriela P1ORCID,Martínez José Miguel23ORCID,Rodríguez-Bagó Mónica4ORCID,Ronda Elena35ORCID

Affiliation:

1. Escuela de Ciencias de la Salud, Universidad Viña del Mar , Viña del Mar 2520000 , Chile

2. School of Public Health, University of Alberta , Edmonton, Alberta T6G 1C9 , Canada

3. Public Health Research Group, University of Alicante , San Vicente del Raspeig, Alicante 03690 , Spain

4. Physiotherapy Service, Department of Health Care, Medical and Health Care Services Division, MC Mutual Barcelona 08037 , Spain

5. CIBERESP , Madrid 28029 , Spain

Abstract

Abstract Objectives To analyze the association between occupational ergonomic risk, personal characteristics, and working conditions with the biomechanical properties of stiffness and muscular tone in the paravertebral muscles of electric pallet jack and forklift operators in the industrial sector. Methods A total of 75 industrial sector machine operators were evaluated in 2021. Personal characteristics and working conditions were assessed through a questionnaire. Ergonomic risk was assessed using the Rapid Entire Body Assessment (REBA) method, and biomechanical properties of stiffness and muscular tone were obtained using the Myoton Pro device. Stiffness in paravertebral muscles was compared based on the operated machine and observed ergonomic risk. A multilevel linear regression model was employed to quantify the relationship, with mean differences and 95% CI calculated. Results Very high ergonomic risk was found in 75% of the electric pallet truck drivers. In this group with the highest ergonomic risk, an association between biomechanical properties and older workers was observed. Additionally, among electric pallet truck drivers, stiffness (mean difference 335.9 N/m, 95% CI: 46.4 (3.4 to 110.0), P < 0.05) and paravertebral muscle tone (mean difference 17.5 Hz, 95% CI: 1.4 (0.1 to 3.4), P < 0.05) showed statistically significant differences in the very high ergonomic risk category compared to the high-risk category. No significant differences were observed in any of the analyzed variables among forklift drivers. Conclusions Workers operating electric pallet trucks with very high ergonomic risk according to the REBA method and aged over 40 yr are associated with increased muscle stiffness and tone.

Funder

Superintendency of Social Security

Institute of Labor Safety with resources from the Social Security Insurance

Publisher

Oxford University Press (OUP)

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