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Motor-cognitive dual-tasking under hypoxia.

Dennis Hamacher1, Marie Brennicke2, Tom Behrendt2

  • 1Department III, Sport Science, Otto von Guericke University Magdeburg, Zschokkestraße 32, 39104, Magdeburg, Germany. dennis.hamacher@ovgu.de.

Experimental Brain Research
|July 20, 2017
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Summary

Hypoxia significantly worsens gait variability and cognitive performance during dual-task walking. This suggests reduced brain resource allocation may impair simultaneous motor and cognitive functions under low oxygen conditions.

Keywords:
Dual taskGaitHypoxiaVariability

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Area of Science:

  • Neuroscience
  • Human Physiology
  • Exercise Science

Background:

  • Hypoxic conditions impair motor and cognitive functions, particularly during simultaneous tasks.
  • Hypoxia increases prefrontal cortex activity, potentially reducing efficient resource utilization.
  • This resource limitation may lead to earlier capacity limits in dual-task scenarios.

Purpose of the Study:

  • To investigate if cognitive tasks increase gait variability more under hypoxia than normoxia.
  • To assess the impact of hypoxia on dual-task performance.

Main Methods:

  • 18 young adults performed walking and cognitive tasks under normoxic and hypoxic conditions.
  • Gait variability (stride times) and cognitive task performance were measured.
  • Statistical analysis included two-way ANOVA and Wilcoxon tests.

Main Results:

  • A significant interaction effect showed greater gait variability increase in dual-task walking under hypoxia compared to normoxia.
  • Cognitive performance while walking was significantly worse under hypoxic conditions.
  • Hypoxia appears to decrease the capacity for performing combined motor-cognitive tasks.

Conclusions:

  • Hypoxia exacerbates gait variability during dual-task walking.
  • Cognitive function is compromised when combined with walking under hypoxic conditions.
  • Hypoxia may necessitate a resource shift away from prefrontal regions during dual-tasking, warranting further investigation.