Electrocardiographic changes following six months of long-distance triathlon training in previously recreationally active individuals
Drane, Aimee L.
Taylor and Francis
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Background: Clinical electrocardiographic (ECG) guidelines for athlete’s heart are based upon cross-sectional data. We aimed to longitudinally evaluate the influence of endurance training on the ECG and compare the prevalence of ECG abnormalities defined by contemporary criteria. Methods: A group of 66 training-naïve individuals completed a six-month training programme with resting ECGs and cardiopulmonary exercise tests performed at baseline, two and six months. Data were analysed using repeated measures analysis of variance and the prevalence of ECG abnormalities compared between proposed criteria. Results: Maximal oxygen consumption increased from 45.4 ± 7.1 to 50.3 ± 7.1 ml·kg−1·min−1 (p < 0.05) pre-to-post training. ECG changes included, bradycardia (60 ± 12 vs. 53 ± 8 beats·min−1; p < 0.05), shorter P wave duration (106 ± 10 vs. 103 ± 11 ms; p < 0.05), reduced QTc (413 ± 27 vs. 405 ± 22 ms; p < 0.05), and increased left ventricular Sokolow-Lyon index (2.45 ± 0.66 vs. 2.62 ± 0.78 mV; p < 0.05). 85% of individuals showed ≥1 ‘training-related’ ECG finding at six months vs. 68% at baseline. Using the 2013 Seattle Criteria, 4 ECGs were ‘abnormal’ at baseline and 3 at month six vs. 2 at baseline and 1 at month six, using the 2017 International Consensus. Prevalence of ‘borderline’ findings did not increase with training (11% at baseline and six months). Conclusion: Six-months endurance training leads to a greater prevalence of ‘training-related’ but not ‘borderline’ or ‘training-unrelated’ ECGs. ‘Borderline findings’ may not necessarily represent training-related cardiac remodelling in novice athletes following a six-month training intervention.
European Journal of Sport Science;
Dawkins, T.G., Shave, R.E., Baggish, A.L., Drane, A.L., Parisi, E.J., Roberts, M.G. and Roberts, J.D. (2019) 'Electrocardiographic changes following six months of long-distance triathlon training in previously recreationally active individuals', European Journal of Sport Science, pp.1-20. 10.1080/17461391.2019.1641556.
Article published in European Journal of Sport Science on 31 July 2019, available at: https://doi.org/10.1080/17461391.2019.1641556.
Cardiff Metropolitan University (Grant ID: Cardiff Metropolian (Internal))
- Sport Research Groups 
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