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Effects of a Short-Term Cycling Interval Session and Active Recovery on Non-Linear Dynamics of Cardiac Autonomic Activity in Endurance Trained Cyclists. | LitMetric

AI Article Synopsis

  • The study investigates how exercise intensity and recovery affect heart rate variability (HRV) and cardiac autonomic activity using the Detrended Fluctuation Analysis (DFA) technique.
  • Sixteen trained cyclists performed interval training and had their heart rate, lactate levels, and perceived exertion measured continuously during and after exercise.
  • Results showed that while heart rate variability decreased during high-intensity intervals, DFA-alpha1 (a measure of HRV complexity) increased during active recovery, indicating a reorganization of cardiac autonomic function in response to exercise demands.

Article Abstract

Measurement of the non-linear dynamics of physiologic variability in a heart rate time series (HRV) provides new opportunities to monitor cardiac autonomic activity during exercise and recovery periods. Using the Detrended Fluctuation Analysis (DFA) technique to assess correlation properties, the present study examines the influence of exercise intensity and recovery on total variability and complexity in the non-linear dynamics of HRV. Sixteen well-trained cyclists performed interval sessions with active recovery periods. During exercise, heart rate (HR) and beat-to-beat (RR)-intervals were recorded continuously. HRV time domain measurements and fractal correlation properties were analyzed using the short-term scaling exponent alpha1 of DFA. Lactate (La) levels and the rate of perceived exertion (RPE) were also recorded at regular time intervals. HR, La, and RPE showed increased values during the interval blocks ( < 0.05). In contrast, meanRR and DFA-alpha1 showed decreased values during the interval blocks ( < 0.05). Also, DFA-alpha1 increased to the level in the warm-up periods during active recovery ( < 0.05) and remained unchanged until the end of active recovery ( = 1.000). The present data verify a decrease in the overall variability, as well as a reduction in the complexity of the RR-interval-fluctuations, owing to increased organismic demands. The acute increase in DFA-alpha1 following intensity-based training stimuli in active recovery may be interpreted as a systematic reorganization of the organism with increased correlation properties in cardiac autonomic activity in endurance trained cyclists.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6407005PMC
http://dx.doi.org/10.3390/jcm8020194DOI Listing

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