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Relationships of irisin levels with resting energy expenditure (REE) (A) (r = 0.40; p = 0.021) and leptin (B) (r = 0.60; p < 0.0001), and relationships of fibroblast growth factor-21 (FGF-21) with body fat mass (FM) (C) (r = 0.46; p = 0.007) and leptin (D) (r = 0.45; p = 0.009) in rhythmic gymnasts.
