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Horizontal plane head stabilization during locomotor tasks.

R L Cromwell1, R A Newton, L G Carlton

  • 1Department of Physical Therapy, University of Texas Medical Branch, 301 University Blvd., Galveston, TX 77555-1028, USA. rcromwel@utmb.edu

Journal of Motor Behavior
|March 27, 2001
PubMed
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Healthy adults maintain head stability during walking, even with altered arm movements. This head stabilization, crucial for clear vision and balance, occurs through coordinated head and trunk movements, suggesting proactive control strategies.

Area of Science:

  • Biomechanics
  • Human movement science
  • Neuroscience

Background:

  • Head stabilization is critical for maintaining visual acuity and vestibular function during locomotion.
  • Understanding head stabilization strategies during perturbed walking provides insight into sensorimotor control.
  • Previous research has primarily focused on sagittal plane perturbations, with less known about horizontal plane challenges.

Purpose of the Study:

  • To investigate the frequency characteristics of head stabilization during various locomotor tasks with horizontal plane perturbations.
  • To determine how altered arm swing affects head stabilization strategies.
  • To explore the underlying mechanisms, including feedforward control, involved in maintaining head stability.

Main Methods:

  • Eight healthy young adults performed normal walking and three perturbed walking tasks with modified arm movements (in-phase, large amplitude, double frequency).

Related Experiment Videos

  • Head-in-space angular velocity and head-on-trunk angular velocity were measured.
  • Frequency analysis was used to characterize head and trunk movements and identify stabilization strategies.

    • Main Results:

    • Head movements occurred at low frequencies (< 4.0 Hz) in all conditions and at higher frequencies (> 4.0 Hz) when arm frequency doubled leg frequency.
    • During normal walking, head-on-trunk movement was less than trunk movement at low frequencies (< 3.0 Hz).
    • At higher frequencies (≥ 3.0 Hz) and with altered arm swing, compensatory movements ensured head stability up to 10.0 Hz.

    Conclusions:

    • Head stabilization is effectively maintained across a range of frequencies during locomotor tasks, including those with significant horizontal perturbations.
    • Altered arm swing did not compromise head stability, suggesting robust compensatory mechanisms.
    • Successful high-frequency head stabilization implies the use of feedforward control strategies to coordinate head and trunk movements, supporting optimal vestibulo-ocular reflex function.