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  Theoretical and experimental evaluation of the multiplicative lifting equation and the general lifting index
 
 
Titel: Theoretical and experimental evaluation of the multiplicative lifting equation and the general lifting index
Auteur: Yeung, Simon S.
Deddens, James
Genaidy, Ash M.
Karwowski, Waldemar
Leung, P.C.
Verschenen in: Occupational ergonomics
Paginering: Jaargang 6 (2006) nr. 1 pagina's 13-24
Jaar: 2006-09-07
Inhoud: The Revised NIOSH Lifting Equation [13] integrated the findings of different approaches reported in the scientific literature into a single mathematical formulation based on the empirical model proposed by Drury and Pfeil [5]. This simple model was tested on a limited basis and the model generalizations have not been examined. The primary objectives of this study were to investigate the performance of the NIOSH lifting equation with general formulations reported by Karwowski [7], and to examine the structure of the lifting index and the relative importance of physical factors (as defined by the lifting index) and non-physical factors (as defined by perceived risk of injury and work dissatisfaction) with respect to workers' perceived effort associated with the lifting conditions. A cross-sectional study was conducted on 217 experienced manual handling workers in the Hong Kong area to validate the study objectives. In this investigation, information was collected on lifting task parameters, perceived effort, perceived risk of injury, and work dissatisfaction. The results suggest that a multiplicative model is better than an additive model in evaluating the effort associated with lifting task performance. In this regard, the exponents of the parameters in the lifting index should be different from 1.0. The best model for evaluating effort emerged from perceived risk of injury and the general lifting index (GLI). Given the limitations of our observational study, the main findings from this research suggest that the multiplicative structure of the NIOSH lifting equation is better than an additive model. In addition, the weighing of lifting task multipliers may need further investigation, and the study of manual lifting tasks should include both physical and non-physical factors when examining the etiologic factors leading to musculoskeletal symptoms and disorders.
Uitgever: IOS Press
Bronbestand: Elektronische Wetenschappelijke Tijdschriften
 
 

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