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Experimental Methods to Study Human Postural Control
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Spinal Reflexes During Postural Control Under Psychological Pressure.

Yoshifumi Tanaka1

  • 1Department of Health and Sports Sciences, Mukogawa Women's University, Hyogo, Japan.

Motor Control
|January 15, 2015
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Summary

Psychological pressure reduces spinal reflex excitability, specifically the soleus Hoffmann reflex amplitude. This reflex inhibition aids in maintaining postural control during stressful situations.

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Area of Science:

  • Neuroscience
  • Human Physiology
  • Psychophysiology

Background:

  • Psychological pressure is known to elicit physiological stress responses.
  • The impact of acute psychological stress on spinal reflex excitability remains an area of active investigation.

Purpose of the Study:

  • To investigate the effect of psychological pressure on spinal reflex excitability during a postural control task.
  • To determine if stress-induced changes in reflexes correlate with performance in a balancing task.

Main Methods:

  • Thirteen participants performed a single-leg balancing task on a disk.
  • Participants underwent both non-pressure and pressure trials, with pressure induced by performance-contingent rewards or punishments.
  • Soleus Hoffmann reflex amplitude was measured to assess spinal reflex excitability.
  • State anxiety, mental effort, and heart rate were monitored to confirm stress induction.

Main Results:

  • Psychological pressure successfully induced stress responses, evidenced by increased state anxiety, mental effort, and heart rate.
  • Soleus Hoffmann reflex amplitude was significantly reduced under pressure compared to non-pressure conditions.
  • Despite reflex modification, 12 out of 13 participants successfully completed the postural control task under pressure.

Conclusions:

  • Psychological pressure leads to a decrease in spinal reflex excitability, likely via presynaptic inhibition.
  • Hoffmann reflex inhibition appears to be a contributing factor to maintaining optimal postural control in stressful environments.