El objetivo de este estudio fue analizar las oscilaciones de la actividad cardíaca parasimpática (ACP) en un mesociclo de una atleta keniata. La variabilidad de la frecuencia cardiaca (VFC) se midió durante tres semanas. En la primera semana (W1) el volumen de entrenamiento fue 120,55 km, en la segunda (W2) 96,71 km y en la tercera (W3) 79,45 km. Se analizó la media semanal de los intervalos (R-R), la expresión logarítmica (Ln) del cuadrado de la raíz media de la unión de los intervalos R-R adyacentes (LnrMSSD), la desviación estándar de los intervalos R-R (LnSDNN), la frecuencia cardíaca media (FC) de cada sesión y las fluctuaciones diarias de LnrMSSD (LnrMSSDCV). Se observaron incrementos significativos en LnrMSSD y LnSDNN de W1 a W3. El LnrMSSDCV fue mayor en W1 comparado a W2 y W3. Este estudio de caso demostró que tanto el volumen como la intensidad de entrenamiento afectaron la ACP de la atleta. Esta monitorización podría ser una valiosa herramienta para prevenir el sobreentrenamiento.

Palabras clave: Sistema nervioso autónomo; Actividad cardíaca parasimpática; Runners keniatas; Atletismo, Resistencia; Mujer.

Abstract

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.

Key words: Autonomous nervous system; Parasympathetic cardiac activity; Kenyan runners; Athletics; Endurance, Women.

https://doi.org/10.5232/ricyde2022.06802

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