Type de document
Études primaires
Année de publication
2016
Langue
Anglais
Titre de la revue
Journal of Biomechanics
Première page
3492
Dernière page
3501
Résumé
Subject-specific parameters influence spinal loads and the risk of back disorders but their relative effects are not well understood. The objective of this study is to investigate the effects of changes in age (35–60 years), sex (male, female), body height (BH: 150–190 cm) and body weight (BW: 50–120 kg) on spinal loads in a full-factorial simulation using a personalized (spine kinematics, geometry, musculature and passive properties) kinematics driven musculoskeletal trunk finite element model. Segmental weight distribution (magnitude and location along the trunk) was estimated by a novel technique to accurately represent obesity. Five symmetric sagittal loading conditions were considered, and main effect plots and analyses of variance were employed to identify influential parameters. In all 5 tasks simulated, BW (98.9% in compression and 96.1% in shear) had the greatest effect on spinal loads at the L4–L5 and L5–S1 levels followed by sex (0.7% in compression and 2.1% in shear), BH (0.4% in compression and 1.5% in shear) and finally age (<5.4%). At identical BH and BW, spinal loads in females were slightly greater than those in males by ~4.7% in compression and ~8.7% in shear. In tasks with no loads in hands, BW-normalized spinal loads further increased with BW highlighting the exponential increase in spinal loads with BW that indicates the greater risk of back disorders especially in obese individuals. Uneven distribution of weight in obese subjects, with more BW placed at the lower trunk, further (though slightly <7.5%) increased spinal loads.
Mots-clés
Différence liée au sexe, Sex difference, Soulèvement des charges, Manual lifting, Poids maximal des charges à porter, Maximum acceptable weight of lift, Colonne vertébrale, Spinal column, Mécanique humaine, Body mechanics, Lésion du tronc, Trunk injury, Affection dorsale, Back disorder, Maux de dos, Backache, Différence liée à l'âge, Age difference, Différence liée à la taille, Height difference, Différence liée au poids corporel, Difference in body weight
Numéro de projet IRSST
2014-0009
Citation recommandée
Ghezelbash, F., Shirazi-Adl, A., Arjmand, N., El Ouaaid, Z., Plamondon, A. et Meakin, J. R. (2016). Effects of sex, age, body height and body weight on spinal loads: Sensitivity analyses in a subject-specific trunk musculoskeletal model. Journal of Biomechanics, 49(14), 3492-3501. https://doi.org/10.1016/j.jbiomech.2016.09.026