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. 2026 Feb 10;8:1660332. doi: 10.3389/fspor.2026.1660332

Figure 2.

Charts display mean frequency comparisons between control and swimmer groups across different brain regions. Panels A, B, and C show mean frequency in different frequency bands, while panels D E F present changes in mean frequency rate between swimmer group and control group for terrestrial and aquatic tasks. Panels G H I present changes in mean frequency rate in the same group between terrestrial and aquatic tasks. Data points and error bars indicate statistical significance with various annotations.

Mean frequency (MF) and the rate of change at theta, alpha, beta spectrum (mean ± 1SEM) on base line, terrestrial, aquatic conditions. (A) MF at theta. (B) MF at alpha. (C): MF at beta. In the theta band, both groups demonstrated a general reduction in MF during task performance in both conditions relative to the resting baseline. In the alpha band, both groups exhibited a marked reduction in MF during tasks relative to the resting baseline. In the beta band, both groups exhibited significantly increased MF across all five regions. The rate of change between groups, (D) MF (theta), (E) MF (alpha), (F) MF (beta). The rate of change between task conditions, (G) MF (theta), (H) MF (alpha), (I) MF (beta). FR, frontal region (pink); FCR, frontal-central region (blue); CR, central region (cyan); CPR, central-parietal region (gray); PR, parietal region (yellow). * significant difference at SG, # significant difference at CG p ≤ 0.05; ** highly significant difference at SG, ## highly significant difference at CG p ≤ 0.01.