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Changes in spinal excitability during dual task performance.

Tyler B Weaver1, Matthew R Janzen, Allan L Adkin

  • 1Department of Kinesiology, Brock University, St. Catharines, Ontario, Canada.

Journal of Motor Behavior
|August 4, 2012
PubMed
Summary
This summary is machine-generated.

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Performing two tasks simultaneously reduces spinal excitability, indicated by a smaller soleus Hoffmann reflex (H-reflex). This suggests a neural strategy to enhance postural stability during dual task performance.

Area of Science:

  • Neuroscience
  • Human Physiology
  • Motor Control

Background:

  • Dual task performance presents significant postural challenges.
  • Understanding the nervous system's response to divided attention is crucial for motor control research.
  • Spinal excitability is a key factor in maintaining balance and posture.

Purpose of the Study:

  • To investigate the effect of dual task performance on spinal excitability.
  • To determine if concurrent cognitive tasks alter neural responses related to posture.
  • To explore the neural strategies employed during dual tasking.

Main Methods:

  • Participants performed single and dual tasks, including a cognitive auditory task.
  • Postural stability was maintained in lying and standing positions.

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  • Spinal excitability was measured using the soleus Hoffmann reflex (H-reflex).

    • Main Results:

    • A significant reduction in H-reflex amplitude was observed during dual tasking compared to single tasking (6.4 ± 2.3%, p = .011).
    • This indicates a depression of spinal excitability when cognitive resources are divided.
    • The findings suggest an adaptive neural mechanism for maintaining postural control.

    Conclusions:

    • Dual task performance leads to reduced spinal excitability.
    • This reduction is likely a neural strategy to enhance postural stability under cognitive load.
    • Further research can explore implications for rehabilitation and aging populations.