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Effect of stance width on multidirectional postural responses.

S M Henry1, J Fung, F B Horak

  • 1R. S. Dow Neurological Sciences Institute, Portland, Oregon 97209, USA. shenry@zoo.uvm.edu

Journal of Neurophysiology
|February 13, 2001
PubMed
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Wider stances reduce the need for active muscle responses during postural control, relying more on passive stiffness. Narrow stances require more effortful active strategies for balance, especially during surface translations.

Area of Science:

  • Biomechanics
  • Human movement science
  • Neuroscience

Background:

  • Postural control is crucial for stability.
  • Stance width influences how the body responds to external perturbations.
  • Understanding these responses is key to preventing falls and injuries.

Purpose of the Study:

  • To investigate the effect of stance width on postural responses to surface translations.
  • To analyze muscle activation patterns, body kinematics, and ground reaction forces.
  • To differentiate between active and passive postural control strategies.

Main Methods:

  • Healthy subjects (n=7) underwent surface translations in 12 directions.
  • Electromyography (EMG) of lower limb and trunk muscles was recorded.
Keywords:
NASA Discipline NeuroscienceNon-NASA Center

Related Experiment Videos

  • Kinematics and foot forces were analyzed using a quasi-static force analysis approach.

    • Main Results:

    • Wider stances lessened horizontal force constraints compared to narrow stances.
    • EMG magnitude decreased in wider stances, while latencies remained consistent.
    • Narrow stances showed greater trunk and center of pressure (CoP) displacement, indicating more active control.

    Conclusions:

    • Equilibrium control shifts from active strategies in narrow stances to passive stiffness in wider stances.
    • Stance width modulates EMG magnitude but not latency, suggesting a consistent underlying postural synergy.
    • Wider stances offer a more passive, less effortful, and stable postural response.