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Related Experiment Video

Updated: Mar 27, 2026

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Subconcussive Preconditioning Modifies Acute Microglial Response and Improves Cognitive Outcomes Post-Concussion.

Erin D Anderson1, Kyulee Kim1, Anastasia P Georges1

  • 1Department of Bioengineering, University of Pennsylvania, Philadelphia, Pennsylvania, USA.

Journal of Neurotrauma
|March 26, 2026
PubMed
Summary
This summary is machine-generated.

Subconcussive head impacts may protect against concussion if timed correctly, mitigating microglial changes and cognitive deficits. Understanding this protective window is key for athletes facing repetitive head trauma.

Keywords:
cognitionmicrogliasubconcussive preconditioning

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Area of Science:

  • Neuroscience
  • Sports Medicine
  • Immunology

Background:

  • Subconcussive impacts are common in contact sports and may increase concussion risk.
  • The precise mechanisms linking repetitive head trauma to concussion outcomes remain unclear.
  • Subconcussive impacts are known to trigger microglial responses in the brain.

Purpose of the Study:

  • To investigate how subconcussive impacts influence microglial morphology and gene expression.
  • To determine the effect of subconcussive preconditioning on cognitive outcomes following concussion.
  • To explore the temporal relationship between subconcussive and concussive impacts on brain response.

Main Methods:

  • Development and validation of a controlled cortical impact model for closed-head injuries.
  • Analysis of microglial morphology and transcriptomic profiles at 1 and 9 days post-injury.
  • Assessment of cognitive function using novel object recognition tests.

Main Results:

  • Concussion induced transient microglial changes, while subconcussive impacts caused delayed changes.
  • Subconcussive preconditioning prevented concussion-induced microglial alterations and upregulated protective genes.
  • Subconcussive impacts delivered within 2 minutes of concussion abolished cognitive deficits, demonstrating a critical time window for protection.

Conclusions:

  • Certain subconcussive impacts can protect against subsequent concussion and associated neuroinflammation.
  • The timing of subconcussive impacts relative to concussion is crucial for their protective effect.
  • Findings may inform strategies to reduce cognitive impairment in athletes with repetitive head trauma.