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Intra-Individual Variability in Vagal Control Is Associated With Response Inhibition Under Stress.

Derek P Spangler1, Katherine R Gamble1, Jared J McGinley2

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Frontiers in Human Neuroscience
|December 14, 2018
PubMed
Summary
This summary is machine-generated.

Dynamic intra-individual variability in cardiac vagal control enhances cognitive function under stress. Greater flexibility in heart rate variability was linked to better stress response, supporting adaptive cognition theories.

Keywords:
cognitionheart rate variabilityintra-individual variabilityresponse inhibitionstress

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Area of Science:

  • Neuroscience
  • Psychology
  • Physiology

Background:

  • Dynamic intra-individual variability (IIV) in cardiac vagal control is theorized to support adaptive cognition under stress.
  • Empirical evidence testing this notion remains limited.

Purpose of the Study:

  • To investigate the association between IIV in cardiac vagal control and cognitive performance under stress.
  • To examine how flexibility in heart rate variability relates to response inhibition during a simulated combat task.

Main Methods:

  • Measured high-frequency heart rate variability (HF-HRV) in 25 male U.S. Army Soldiers during rest and a shooting task (training, low stress, high stress).
  • Assessed response inhibition as correct rejections during low and high stress conditions.
  • Analyzed the relationship between HF-HRV variability across conditions and changes in response inhibition.

Main Results:

  • Greater IIV in vagal control was associated with higher resting vagal tone.
  • Increased IIV correlated with stronger stress-related declines in response inhibition.
  • Flexibility in vagal control was linked to adaptive cognitive responses under stress.

Conclusions:

  • Vagal control flexibility is supported by tonic vagal control.
  • This flexibility uniquely contributes to adaptive cognition during stressful situations.
  • Findings align with neurobehavioral and dynamical systems theories of vagal function.