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Related Experiment Video

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Experimental Methods to Study Human Postural Control
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Complementary mechanisms for upright balance during walking.

Hendrik Reimann1, Tyler D Fettrow1, Elizabeth D Thompson1,2

  • 1Department of Kinesiology, Temple University, Philadelphia, PA, United States of America.

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|February 25, 2017
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Summary

Humans use both ankle and stepping strategies to maintain balance during walking. A small ankle shift and a larger step adjustment work together to prevent falls, showing their independent yet coordinated roles in upright stability.

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Area of Science:

  • Biomechanics
  • Human Locomotion
  • Neuroscience

Background:

  • Maintaining upright balance during walking is crucial for preventing falls.
  • Two primary balance control mechanisms are the stepping strategy and the lateral ankle strategy.
  • Limited research exists on the combined use of these strategies during locomotion.

Purpose of the Study:

  • To investigate how the stepping and lateral ankle strategies interact to maintain upright balance.
  • To examine the immediate responses to a simulated fall during gait initiation.

Main Methods:

  • Galvanic vestibular stimulation (GVS) was used to induce a sensation of falling at heel-off during gait initiation in healthy adults.
  • Center of pressure (CoP) shifts and subsequent foot placement adjustments were measured.

Main Results:

  • Participants employed both lateral ankle and stepping strategies in response to GVS-induced illusory falls.
  • A small shift in stance foot CoP (≈2.5 mm) occurred early (≈247 ms post-stimulus).
  • A larger step placement shift (≈15 mm) followed, indicating independent contributions.

Conclusions:

  • The lateral ankle and stepping strategies contribute independently and serially to upright balance during locomotion.
  • The early CoP shift from the lateral ankle strategy is critical for stability, reducing the need for larger step adjustments.
  • Further research is needed to understand the relative importance of each strategy and their impairment in neurological disorders.