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2024-08-19 15:28:00
Many studies have shown that potentially fatal cardiac arrhythmia is more likely to occur in the morning. However, the reasons for the link between this time of day and the condition were unclear until a recent study was able to reveal the foundations of this relationship.
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Cardiac arrhythmia is a heart rhythm disorder that causes the heart to have various abnormalities in its beats, whether it is too fast, too slow or irregular. This condition causes various symptoms ranging from chest pain to fainting, difficulty breathing and dizziness or vertigo. According to various studies, this condition can occur more frequently in the morning, however the mechanism capable of causing it was unknown, until a recent study.
Why are cardiac arrhythmias more likely to occur in the morning?
Research provided by Imperial College London revealed that abnormalities in heart function are linked to natural changes and daily fluctuations in the stress hormone. This hormone tends to spike in our blood in the morning, which can be linked to cardiac arrhythmia.
The study in mice found that cortisol binds to a specific receptor on heart cells. This receptor travels to the nucleus of the heart cells where it influences genes that regulate ion channels in the cell membrane that control heart rhythms. By changing the activity of ion channels, the heart becomes more vulnerable, causing the regular electrical impulses that cause the heart to beat regularly to change into more chaotic activity or become arrhythmia.
The circadian rhythm of cortisol is affected by sleep, with an increase in cortisol just a few minutes after an individual wakes up. According to one of the authors of the study, Alicia D’Souza, “Our heart becomes more vulnerable in the morning due to the already known circadian rhythms of our body that have evolved over the years. Although this study was carried out in mice, all species experience this process, so we believe that it is directly applicable to humans and the hearts of different mammals.”
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