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Open Access Study protocol

Rate of cardiac arrhythmias and silent brain lesions in experienced marathon runners: rationale, design and baseline data of the Berlin Beat of Running study

Karl Georg Haeusler12*, Juliane Herm2, Claudia Kunze2, Matthias Krüll34, Lars Brechtel345, Jürgen Lock34, Marc Hohenhaus2, Peter U Heuschmann26, Jochen B Fiebach2, Wilhelm Haverkamp7, Matthias Endres128 and Gerhard Jan Jungehulsing12

Author Affiliations

1 Department of Neurology, Charité Berlin Campus Benjamin Franklin, Hindenburgdamm 30, 12203, Berlin, Germany

2 Center for Stroke Research University Medicine Berlin, Campus Benjamin Franklin, Hindenburgdamm 30, Berlin, 12203, Charité, Germany

3 SMS Sports Medicine Berlin, Medical Institute of the BMW BERLIN-MARATHON, , Germany

4 Berliner Akademie für Sportmedizin e.V, Berlin, Germany

5 Department of Sports Medicine, Humboldt-University, Berlin, Germany

6 Institute of Clinical Epidemiology and Biometry, Center for Clinical Studies and Comprehensive Heart Failure Center, University Hospital, Würzburg, Germany

7 Department of Cardiology, Campus Vichow-Klinikum, Berlin, Charité, Germany

8 Excellence Cluster NeuroCure, Charité - Universitätsmedizin Berlin, Berlin, Germany

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BMC Cardiovascular Disorders 2012, 12:69  doi:10.1186/1471-2261-12-69

Published: 31 August 2012

Abstract

Background

Regular exercise is beneficial for cardiovascular health but a recent meta-analysis indicated a relationship between extensive endurance sport and a higher risk of atrial fibrillation, an independent risk factor for stroke. However, data on the frequency of cardiac arrhythmias or (clinically silent) brain lesions during and after marathon running are missing.

Methods/ Design

In the prospective observational “Berlin Beat of Running” study experienced endurance athletes underwent clinical examination (CE), 3 Tesla brain magnetic resonance imaging (MRI), carotid ultrasound imaging (CUI) and serial blood sampling (BS) within 2-3 days prior (CE, MRI, CUI, BS), directly after (CE, BS) and within 2 days after (CE, MRI, BS) the 38th BMW BERLIN-MARATHON 2011. All participants wore a portable electrocardiogram (ECG)-recorder throughout the 4 to 5 days baseline study period. Participants with pathological MRI findings after the marathon, troponin elevations or detected cardiac arrhythmias will be asked to undergo cardiac MRI to rule out structural abnormalities. A follow-up is scheduled after one year.

Results

Here we report the baseline data of the enrolled 110 athletes aged 36-61 years. Their mean age was 48.8 ± 6.0 years, 24.5% were female, 8.2% had hypertension and 2.7% had hyperlipidaemia. Participants have attended a mean of 7.5 ± 6.6 marathon races within the last 5 years and a mean of 16 ± 36 marathon races in total. Their weekly running distance prior to the 38th BMW BERLIN-MARATHON was 65 ± 17 km. Finally, 108 (98.2%) Berlin Beat-Study participants successfully completed the 38th BMW BERLIN-MARATHON 2011.

Discussion

Findings from the “Berlin Beats of Running” study will help to balance the benefits and risks of extensive endurance sport. ECG-recording during the marathon might contribute to identify athletes at risk for cardiovascular events. MRI results will give new insights into the link between physical stress and brain damage.

Trial registration

clinicaltrials.gov NCT01428778

Keywords:
Marathon running; ECG-recording; Magnetic resonance imaging; Blood sampling; Cardiac arrhythmia