Presentation
Load Transfer Between Lumbar Tissues: Implications for Biomechanical Modeling
DescriptionThis study presents an EMG-assisted model that modifies muscle force based on fatigue level and includes passive tissues to explore the time-dependent changes in spinal loading at the L4/L5 disc during sustained, near full trunk flexion posture. Sixteen participants held a 12-minute static trunk flexion posture (10° less than the trunk flexion angle at flexion-relaxation of lumbar paraspinals) while EMG and kinematic data were recorded. Results revealed significant increases in both compression and anterior-posterior shear forces (by 181.7 N and 125.2 N, respectively) at the end of the trunk flexion compared to the beginning (p < 0.001), despite constant external moment. This was attributed to a time-dependent increase in the proportion of passive tissues resisting the external moment (39.9% to 49.5%). These results highlight the significance of time-dependent load transfer to passive tissues in accurately estimating spinal loading during prolonged flexed postures.
Event Type
Lecture
TimeThursday, October 16th3:40pm - 4pm CDT
LocationGrand Hall K
Occupational Ergonomics
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