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52
seat can be considered as a threshold limit in order to avoid
any risk of fracture after 40 years of exposure. This level is
very conservative due to the assumption on the excitation
frequency. This study is still at its preliminary development
and aims to give a direction for research. Eventually, this
method could be generalized and many assumptions and
parameters could be refined if technical data were availa-
ble. The future of this research is aimed at investigating, by
an experimental approach, the fatigue behaviour of lumbar
spine in order to validate our model.
Acknowledgements
The authors gratefully acknowledge the financial support
provided by the ‘’Institut de Recherche en Santé et Sécurité
du Travail (IRSST-Montréal) ’’ and the Natural Sciences and
Engineering research council of Canada (NSERC) through
grants to graduate students.
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