Presentation
Viscoelastic Creep in Lumbar Tissues: Implications for Biomechanical Modeling
DescriptionThis study explored the impact of viscoelastic creep in lumbar passive tissues on internal moment predictions from a lumbar biomechanical model. Sixteen participants performed slow, controlled trunk flexion motion after two 30-minute exposure-recovery protocols conducted on separate days, alternating between full trunk flexion and upright standing. Three models were employed: 1) only EMG-assisted model (Active), 2) EMG-assisted model with time-invariant passive tissue (No-Creep), and 3) EMG-assisted model with time-variant passive tissue components (Creep). The mean absolute error (MAE) between the external moment and predicted internal moment was assessed across model types and trunk flexion angles. Results revealed that the MAE of the Creep model was significantly smaller than that of the No-Creep and Active models beyond the trunk flexion angle of flexion-relaxation of lumbar paraspinals. The further analysis showed that the Creep model prevented the overestimation of compression and shear forces on the L4/L5 disc at full flexion compared to the No-Creep model.
Event Type
Lecture
TimeThursday, October 16th3:20pm - 3:40pm CDT
LocationGrand Hall K
Occupational Ergonomics
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