The purpose of this study was to analyze cardiac-parasympathetic activity (CPA) oscillations in a Kenyan female distance athlete during a training mesocycle. Daily Heart Rate Variability (HRV) was assessed daily throughout a 3-week mesocycle. The training volume was 120.55 km, 96.71 km, and 79.45 km in the first (W1), second (W2), and third week (W3) respectively. Outcome measurements included the weekly averages of the beat-to-beat consecutive interval (R-R), the logarithmic expression (Ln) of the root mean square of successive R-R interval differences (LnrMSSD), the standard deviation of normal-to-normal R-R intervals (LnSDNN), the average heart rate (HR) of each workout, and the day-to-day fluctuations of the LnrMSSD (LnrMSSDCV). Significant increases were observed in LnrMSSD and LnSDNN from W1 to W3. LnrMSSDCV was greater in W1 compared to W2 and W3. This case study demonstrated that training volume and intensity affected athlete`s CPA. Monitoring and tracking HRV might be a useful strategy to prevent from overtraining syndrome.
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