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Related Experiment Videos

Relationship between standing posture and stability

C G Danis1, D E Krebs, K M Gill-Body

  • 1MGH Institute of Health Professions, Boston 02114-4719, USA. krebs.david@mgh.harvard.edu

Physical Therapy
|May 23, 1998
PubMed
Summary
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Individuals with vestibular hypofunction show reduced stability but not distinct postural differences. Adjusting stance width significantly alters whole-body movement patterns for stability control.

Area of Science:

  • Biomechanics
  • Human Movement Science
  • Vestibular System

Background:

  • Vestibular hypofunction is associated with balance impairments.
  • Previous research suggests potential postural aberrations in individuals with stability deficits.

Purpose of the Study:

  • To determine if individuals with stability impairments exhibit postural aberrations.
  • To investigate the relationship between whole-body posture and center-of-gravity (COG) stability.

Main Methods:

  • Optoelectronic system and force plates analyzed kinematics and ground reaction forces.
  • 27 subjects with vestibular hypofunction and 26 controls were studied.
  • Postural data collected during standing with feet apart and feet together, with eyes open and closed.

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Main Results:

  • Subjects with vestibular hypofunction had significantly less stability but no significant postural differences compared to controls.
  • Vestibular hypofunction group exhibited increased weight on the left lower extremity when standing with feet apart.
  • All subjects showed anterior COG, anterior pelvic tilt, trunk/head extension, lateral trunk/pelvis flexion, and knee flexion; these increased with feet together stance.

Conclusions:

  • Posture and stability showed a low correlation.
  • Bilateral vestibular hypofunction did not result in the anecdotally reported forward head or backward trunk lean.
  • Altering stance width (feet apart to feet together) increased whole-body movement for stability control.