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Circadian rhythms in dynamic electrocardiography.

V de Leonardis, P Cinelli, F Capacci

    Journal of Electrocardiology
    |October 1, 1983
    PubMed
    Summary
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    This study found significant daily rhythms in heart rate and ECG measures like R-wave, T-wave, QT interval, and ST segment in healthy adults. However, corrected QT interval (QTc) did not show a significant circadian rhythm.

    Area of Science:

    • Cardiology
    • Chronobiology
    • Physiology

    Background:

    • Circadian rhythms influence various physiological processes.
    • Understanding daily variations in cardiac electrophysiology is crucial for cardiovascular health assessment.

    Purpose of the Study:

    • To investigate the presence of circadian rhythms in multiple electrocardiogram (ECG) parameters.
    • To analyze daily variations in heart rate and specific ECG waveform characteristics in healthy adults.

    Main Methods:

    • Dynamic electrocardiography (ECG) was performed on ten healthy subjects (aged 32-58 years) over 24 hours.
    • ECG recordings (14 seconds) were taken every 15 minutes using a CM 5 lead.
    • Data analysis utilized "Mean Cosinor" to identify statistically significant circadian rhythms.

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    Main Results:

    • Statistically significant circadian rhythms were observed for heart rate (HR), R-wave voltage, T-wave voltage, QT interval duration, and ST segment displacement.
    • No statistically significant circadian rhythm was detected for the corrected QT interval (QTc).

    Conclusions:

    • Healthy adults exhibit significant daily fluctuations in several key cardiac electrophysiological parameters.
    • The corrected QT interval (QTc) appears to maintain a stable rhythmicity, unaffected by the studied circadian influences.