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Assessing Dynamic Atrioventricular Conduction Time to RR-interval Coupling in Athletes and Sedentary Subjects.
Paulo Roberto Benchimol-Barbosa1, Olivassé Nasario Junior2, Jurandir Nadal2
1Hospital Universitário Pedro Ernesto, Rio de Janeiro, RJ, Brasil.
Arquivos Brasileiros De Cardiologia
|May 14, 2020
Summary
Elite athletes exhibit distinct atrioventricular conduction time (AVCT) dynamics compared to sedentary individuals. Their heart rate variability and AVCT-RR interval relationships are key predictors of exercise capacity.
Area of Science:
- Cardiology
- Autonomic Nervous System Physiology
- Exercise Physiology
Background:
- Atrioventricular conduction time (AVCT) is modulated by autonomic nervous system input and physiological adaptations.
- Understanding AVCT and RR-interval variability dynamics is crucial for assessing cardiovascular health, particularly in athletes.
Purpose of the Study:
- To compare beat-by-beat atrioventricular conduction time (AVCT) and RR-interval variability between elite endurance athletes and healthy sedentary adults.
- To investigate the relationship between AVCT, RR-interval variability, and maximal exercise capacity (MET).
Main Methods:
- Twenty adults (10 elite runners, 10 sedentary controls) underwent maximal exercise testing and 15-minute resting ECG.
- Atrioventricular conduction time (AVCT) and RR-intervals (RR) were analyzed beat-by-beat.
- Regression analysis (RR-AVCT slope) assessed conduction dynamics; multivariate models identified predictors of MET.
Main Results:
- Athletes showed higher mean and standard deviation of RR-intervals (M-RR, SD-RR) but similar AVCT metrics compared to controls.
- Athletes exhibited a significantly different RR-AVCT slope, indicating discordant AV conduction.
- SD-RR and RR-AVCT slope were independent predictors of maximal exercise capacity (MET), with high diagnostic accuracy.
Conclusions:
- Elite runners display discordant atrioventricular conduction, characterized by a negative AVCT vs. RR-interval regression slope.
- Heart rate variability (SD-RR) and AVCT-RR slope dynamics are significant independent predictors of exercise capacity in athletes.
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