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European Journal of Applied Physiology

Erschienen in:

01.08.2014 | Original Article

Characterization of electrocardiogram changes throughout a marathon

verfasst von: Vanessa Franco, Clifton Callaway, David Salcido, Serina McEntire, Ronald Roth, David Hostler

Erschienen in: European Journal of Applied Physiology | Ausgabe 8/2014

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Abstract

Purpose

There are few data examining cardiovascular physiology throughout a marathon. This study was devised to characterize electrocardiographic activity continuously throughout a marathon.

Methods

Cardiac activity was recorded from 19 subjects wearing a Holter monitor during a marathon. The 19 subjects (14 men and 5 women) were aged 39 ± 16 years (mean ± SD) and completed a marathon in 4:32:16 ± 1:23:35. Heart rate (HR), heart rate variability (HRV), T-wave amplitude, T-wave amplitude variability, and T-wave alternans (TWA) were evaluated continuously throughout the marathon.

Results

Averaged across all subjects, HRV, T-wave amplitude variability, and TWA increased throughout the marathon. Increased variability in T-wave amplitude occurred in 86 % of subjects, characterized by complex oscillatory patterns and TWA. Three min after the marathon, HR was elevated and HRV was suppressed relative to the pre-marathon state.

Conclusion

HRV and T-wave amplitude variability, especially in the form of TWA, increase throughout a marathon. Increasing TWA as a marathon progresses likely represents a physiologic process as no arrhythmias or cardiac events were observed.

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Titel: Characterization of electrocardiogram changes throughout a marathon
verfasst von: Vanessa Franco
Clifton Callaway
David Salcido
Serina McEntire
Ronald Roth
David Hostler
Publikationsdatum: 01.08.2014
Verlag: Springer Berlin Heidelberg
Erschienen in: European Journal of Applied Physiology / Ausgabe 8/2014
Print ISSN: 1439-6319
Elektronische ISSN: 1439-6327
DOI: https://doi.org/10.1007/s00421-014-2898-6

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Abstract

Purpose

Methods

Results

Conclusion

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