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Related Experiment Videos

Lumbar-pelvic coordination is influenced by lifting task parameters.

K P Granata1, A H Sanford

  • 1Motion Analysis and Motor Performance Laboratory, University of Virginia, Charlottesville, Virginia 22903, USA.

Spine
|June 1, 2000
PubMed
Summary

Lifting heavier loads increases the lumbar spine's contribution to trunk motion, altering lumbar-pelvic coordination. Unloaded spinal movements may not accurately reflect how the spine behaves under load.

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Area of Science:

  • Biomechanics of human movement
  • Spinal kinematics and coordination

Background:

  • Sagittal trunk extension relies on coordinated pelvic and lumbar spine motion.
  • Limited data exist on how lifting task design affects lumbar-pelvic coordination.

Purpose of the Study:

  • To assess the impact of load and lifting velocity on lumbar-pelvic (LP) coordination.
  • To understand how different task parameters influence spinal movement patterns.

Main Methods:

  • Quantified low back kinematics, including relative lumbar and pelvic motions, during controlled lifting.
  • Recorded lumbar and pelvic motion in 18 healthy subjects during isokinetic lifting tasks with 0.1 kg and 10 kg loads.
  • Evaluated coordinated motions using eigenvector analyses and lumbar-to-pelvic angle ratios (L/P).

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Main Results:

  • Eigenvector models effectively represented lumbar-pelvic coordination profiles.
  • Significantly greater influence of load on lumbar-pelvic coordination.
  • Trunk extension velocity had a minor but significant effect on coordination.
  • Load and trunk flexion angle impacted L/P ratios.

Conclusions:

  • Trunk extension involves simultaneous, nonlinear contributions from the pelvis and lumbar spine.
  • The lumbar spine contributes ~70% to motion, with increased pelvic role in flexed postures.
  • Increased task weight enhances lumbar contribution to total trunk motion.
  • Clinical evaluations of spinal kinematics should consider loaded behaviors, as unloaded motions may not be representative.