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Lumbar-pelvic coordination in the sitting position.

Satoshi Kasahara1, Kenji Miyamoto, Mitsuhiko Takahashi

  • 1Division of Physical Therapy, Department of Health Sciences, School of Medicine, Hokkaido Univercity, West 5 North 12, Kitaku, Sapporo 060-0812, Japan. kasahara@cme.hokudai.ac.jp

Gait & Posture
|February 6, 2008
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Summary

Lumbar-pelvic coordination occurs during sitting, with distinct movement patterns observed between forward bending and rising phases. This coordination is task-dependent, offering insights for clinical applications.

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Area of Science:

  • Biomechanics
  • Kinesiology
  • Human Movement Science

Background:

  • Understanding lumbar-pelvic coordination is crucial for assessing spinal health and function.
  • The sitting position presents unique biomechanical challenges for maintaining spinal stability and mobility.

Purpose of the Study:

  • To investigate the relationship between lumbar spine and pelvic movement directions.
  • To evaluate lumbar-pelvic coordination during different sitting tasks in healthy individuals.

Main Methods:

  • Utilized a flexible electrogoniometer to record lumbar and pelvic motion in 12 healthy subjects.
  • Analyzed lumbar-pelvic coordination using the ratio of lumbar to pelvic angles (L/P ratio) across three distinct motion phases.
  • Compared L/P ratio values during forward bending and rising from a flexed position.

Main Results:

  • Significant differences in L/P ratio were found between forward bending and rising phases (P<0.01).
  • A consistent L/P ratio of approximately -0.7 was observed during the transition from erect to slumped sitting, indicating opposing lumbar and pelvic movements.
  • Lumbar-pelvic coordination was evident despite variations in movement tasks.

Conclusions:

  • Lumbar-pelvic coordination is a fundamental aspect of movement in the sitting position.
  • The kinematic patterns of lumbar-pelvic coordination are influenced by the specific movement task.
  • Findings provide insights into spinal kinematics and can inform the development of targeted sitting exercises for patient independence.