Exploratory insights from the right-sided electrocardiogram following prolonged endurance exercise
Rachel Lord1, Keith George1, John Somauroo1,2
1a Research Institute for Sport and Exercise Sciences , Liverpool John Moores University , Liverpool , UK.
European Journal of Sport Science
|March 31, 2016
Summary
Strenuous endurance exercise significantly alters right-sided ECG readings in athletes, indicating acute cardiac electrical adaptation. These findings highlight the impact of ultra-marathons on the right heart.
Area of Science:
- Sports Medicine
- Cardiology
- Exercise Physiology
Background:
- Prolonged strenuous exercise significantly impacts cardiac function.
- The right heart may be more susceptible to the effects of extreme exertion.
- Right-sided chest leads have not been widely utilized to assess cardiac function during endurance events.
Purpose of the Study:
- To investigate the effects of a 100-mile ultra-marathon on right-sided electrocardiogram (ECG) parameters.
- To assess acute exercise-induced electrical adaptations in the right heart.
Main Methods:
- Thirty highly trained athletes participating in a 100-mile endurance run were enrolled.
- Right-sided 12-lead ECGs were recorded before and after the race.
- Analysis focused on P wave, R wave, S wave, J point, ST segment, and T wave parameters, with statistical significance set at P < .05.
Main Results:
- Standard ECG showed increased P wave amplitude (29%) and QTc interval (4%) post-race.
- Right-sided ECG revealed significant increases in J point amplitude in V1R (23%) and V2R (38%).
- ST segment integral increased in V2R and V3R (22%), and T wave inversion occurred in V2R-V6R in 50-90% of athletes.
Conclusions:
- Completing a 100-mile ultra-marathon induces significant changes in right-sided ECG.
- Post-race P wave, ST segment, and T wave alterations suggest acute, exercise-induced electrical adaptation of the right heart.
- Individual responses varied, indicating marked heterogeneity in cardiac adaptation to extreme endurance exercise.
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