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Related Experiment Videos

Does body stability depend on postural chain mobility or stability area?

E Kantor1, L Poupard, S Le Bozec

  • 1Laboratoire de physiologie du mouvement, Université Paris-Sud, 91405 Orsay, France. eleonore.kantor@lpm.u-psud.fr

Neuroscience Letters
|July 18, 2001
PubMed
Summary

Postural stability is influenced by both the support base area and the mobility of the entire postural chain, particularly the pelvis and lumbar spine. This research investigated how breathing affects balance in various postures.

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Area of Science:

  • Biomechanics
  • Human Physiology
  • Postural Control

Background:

  • Postural stability is crucial for maintaining balance.
  • Previous research has primarily focused on the support base area's role in stability.
  • The influence of respiratory movements on postural control remains less understood.

Purpose of the Study:

  • To investigate if postural stability is solely determined by the support base perimeter.
  • To examine the impact of respiratory variations (quiet breathing, deep breathing, apnea) on postural stability.
  • To assess the role of postural chain mobility, specifically pelvis and lumbar spine, in maintaining balance during respiratory challenges.

Main Methods:

  • Seven healthy subjects maintained standing and two sitting postures with varying stability areas and pelvis mobility.

Related Experiment Videos

  • Measurements included thoracic perimeter, center of pressure (CP) displacement, and iliac crest acceleration (as an index of pelvis mobility).
  • Subjects performed quiet breathing, deep breathing, and breath-holding (apnea).

    • Main Results:

    • Sway path (SP) was significantly longer in seated postures compared to standing, and in the Sit100 posture versus Sit30.
    • The distance between extreme CP positions (Delta Xp) showed an inverse relationship with SP.
    • Iliac crest and thoracic displacements were synchronized in sitting postures but lacked a clear pattern when standing.

    Conclusions:

    • Postural steadiness is dependent on both the stability area and the mobility of the postural chain.
    • Pelvic and lumbar spine mobility contribute significantly to the overall postural chain mobility.
    • These factors are essential for compensating for perturbations caused by respiratory movements.