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Methodological considerations for the calculation of cumulative compression exposure of the lumbar spine: a sensitivity analysis on joint model and time standardization approaches.
Fischer, S L; Albert, W J; McClellan, A J; Callaghan, J P.
Afiliação
  • Fischer SL; Department of Kinesiology, University of Waterloo, Waterloo, ON, Canada.
Ergonomics ; 50(9): 1365-76, 2007 Sep.
Article em En | MEDLINE | ID: mdl-17654030
Cumulative lumbar spine loading has attracted much attention as a factor associated with the development of low back pain. While evidence supports cumulative loading to be a plausible mechanism in explaining several workplace injuries, research establishing a threshold limit value (TLV) for cumulative spine loading has been challenging. The lack of a TLV or even a trend towards harmful cumulative load values may suggest that methodological considerations are greatly influencing the results. This paper examines the impact of different joint models (single muscle equivalent, an electromyography-based third order polynomial, a modified version of the polynomial and a hybrid approach) to determine cumulative spine compression, as well as the importance of time standardization in the calculation of a daily cumulative loading dose. Findings demonstrated that the polynomial predicted cumulative compression values were 43-53% higher than those with all other models tested and the single muscle equivalent predicted loads 18% higher than loads predicted using a modified polynomial. Profound differences between modelling approaches suggest that caution should be taken when selecting a muscle model to determine cumulative spine compressive loading. Time standardized cumulative compression values were found to be 28.3% greater than non-standardized estimates, illustrating the importance of selecting a standard time frame in the calculation of cumulative spine compression.
Assuntos
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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Compressão da Medula Espinal / Ergonomia / Região Lombossacral Tipo de estudo: Diagnostic_studies / Prognostic_studies Limite: Adult / Female / Humans / Male / Middle aged País/Região como assunto: America do norte Idioma: En Ano de publicação: 2007 Tipo de documento: Article
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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Compressão da Medula Espinal / Ergonomia / Região Lombossacral Tipo de estudo: Diagnostic_studies / Prognostic_studies Limite: Adult / Female / Humans / Male / Middle aged País/Região como assunto: America do norte Idioma: En Ano de publicação: 2007 Tipo de documento: Article