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Treadmill Exercise Modulates TNF-α and IL-1β Expression in Rodent Models of CNS Inflammation: A Systematic Review.

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International Journal of Developmental Neuroscience : the Official Journal of the International Society for Developmental Neuroscience
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Treadmill exercise can reduce brain inflammation markers like tumour necrosis factor-alpha (TNF-α) and interleukin-1 beta (IL-1β) in rodents. Exercise intensity is key, with vigorous exercise showing greater benefits than light exercise overall.

Keywords:
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Area of Science:

  • Neuroscience
  • Exercise Physiology
  • Inflammation Research

Background:

  • Neuroinflammation, driven by mediators like TNF-α and IL-1β, exacerbates CNS disorders.
  • Understanding modulators of neuroinflammation is crucial for developing therapeutic strategies.

Purpose of the Study:

  • To systematically review preclinical studies on treadmill exercise effects on brain TNF-α and IL-1β expression in male rodents.
  • To identify exercise parameters (intensity, duration) influencing these inflammatory markers.

Main Methods:

  • Systematic review of 17 preclinical studies involving 26 observations in male rats and mice.
  • Standardized cytokine responses (log₂ fold change) for cross-study comparison.
  • Statistical analyses including Kruskal-Wallis, Dunn's, and two-way ANOVA to assess exercise effects.

Main Results:

  • Exercise intensity significantly reduced TNF-α and IL-1β levels, with vigorous exercise showing greater effects than light exercise.
  • No significant differences were found based on exercise duration, specific cytokine marker, or species (rats vs. mice).
  • In neurodegenerative models, moderate intensity exercise yielded the largest reduction, while vigorous intensity offered no additional benefit over moderate.

Conclusions:

  • Treadmill exercise can modulate neuroinflammatory signaling in the rodent brain.
  • Exercise intensity is a critical factor, with optimal intensity potentially depending on the specific neurological context (e.g., neurodegenerative models).
  • Limitations include male-only samples, methodological heterogeneity, and potential biases in study quality.