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PRODID:Linklings LLC
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TZID:America/Chicago
X-LIC-LOCATION:America/Chicago
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DTSTART:19700308T020000
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DTSTART:19701101T020000
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BEGIN:VEVENT
DTSTAMP:20251016T135208Z
LOCATION:Grand Hall K
DTSTART;TZID=America/Chicago:20251016T154000
DTEND;TZID=America/Chicago:20251016T160000
UID:HFESAM_ASPIRE 2025_sess307_LECT152@linklings.com
SUMMARY:Load Transfer Between Lumbar Tissues: Implications for Biomechanic
 al Modeling
DESCRIPTION:Sang Hyeon Kang (Western Michigan University) and Gary Mirka (
 Iowa State University)\n\nThis study presents an EMG-assisted model that m
 odifies muscle force based on fatigue level and includes passive tissues t
 o explore the time-dependent changes in spinal loading at the L4/L5 disc d
 uring sustained, near full trunk flexion posture. Sixteen participants hel
 d a 12-minute static trunk flexion posture (10° less than the trunk flexio
 n angle at flexion-relaxation of lumbar paraspinals) while EMG and kinemat
 ic data were recorded. Results revealed significant increases in both comp
 ression and anterior-posterior shear forces (by 181.7 N and 125.2 N, respe
 ctively) at the end of the trunk flexion compared to the beginning (p < 0.
 001), despite constant external moment. This was attributed to a time-depe
 ndent 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 spina
 l loading during prolonged flexed postures.\n\nTrack: Occupational Ergonom
 ics\n\nSession Chair: Feyisayo Akinwande (Virginia Polytechnic Institute a
 nd State University)\n\n
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