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Abstract The aim of this study was to analyze the dynamic behavior of the high-frequency component (HF0.15Hz) of heart rate variability (HRV) and the respiratory frequency in relation to the anaerobic threshold (AT). Twenty-two healthy subjects [mean (SD) age: 24 (6)years, height: 175 (10)cm, body mass: 65 (11)kg] completed a ramp load, with increments of 20Wmin1, on a cycle ergometer. The AT was...