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Related Experiment Videos

Intra-abdominal pressure response to multidirectional support-surface translation.

Paul W Hodges1, Andrew G Cresswell, Alf Thorstensson

  • 1Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden. p.hodges@shrs.uq.edu.au

Gait & Posture
|September 1, 2004
PubMed
Summary

Intra-abdominal pressure (IAP) helps stabilize the trunk during postural adjustments to support surface changes. Increased IAP contributes to spinal stiffening, aiding balance recovery.

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Area of Science:

  • Biomechanics
  • Human Physiology
  • Motor Control

Background:

  • Trunk muscles play a key role in maintaining equilibrium against support surface perturbations.
  • Intra-abdominal pressure (IAP) is hypothesized to contribute to trunk stability during postural control.

Purpose of the Study:

  • To investigate the specific contribution of intra-abdominal pressure (IAP) to the postural response during multidirectional support surface translations.
  • To quantify the relationship between IAP changes and trunk movement strategies.

Main Methods:

  • Intra-abdominal pressure (IAP) was measured using a nasogastric thin-film pressure transducer.
  • Trunk kinematics were recorded using an optoelectronic system with markers placed on the L1 spinous process.
  • Subjects experienced multidirectional support surface translations to elicit postural responses.

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Main Results:

  • Trunk movement patterns indicated a 'hip' strategy for postural control, shifting the center of gravity over the new base of support.
  • Intra-abdominal pressure (IAP) increased during translations in all directions, with direction-dependent timing and amplitude variations.
  • IAP responses were generally larger and initiated earlier for sagittal plane (backward) translations compared to frontal plane translations.

Conclusions:

  • Intra-abdominal pressure (IAP) actively contributes to the postural response during support surface translations.
  • The findings suggest that increased IAP serves to stiffen the spine, enhancing postural stability.