Abstract
The present systematic review aimed to provide a comprehensive understanding of the relationship between the intensity of physical activity and brain activity measured using functional near-infrared spectroscopy (fNIRS). Following the Preferred Reporting Items for Systematic Review and Meta-Analyses guidelines, studies investigating the effect of exercise intensity on brain activity were selected and summarized. Inclusion criteria were as follows: randomized controlled trial design; an adult population; physical activity; and evaluation of the effectiveness of fNIRS in assessing cognition. 11 studies were included in the analysis, 2 of which examined light-intensity exercise, 3 of which examined moderate-intensity exercise, 3 of which examined high-intensity exercise, and 3 of which compared brain activity across different intensities. Synthesis of the literature provides valuable insights into the intersection of physical activity, brain activity, and fNIRS, and contributes to a comprehensive understanding of this multifaceted relationship.
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