Abstract
The chapter presents the methodology of QT interval measurement and of the heart rate correction of the QT interval. It stresses the importance of incorporating the QT/RR hysteresis correction into the analysis of heart rate underlying individual QT values. Based on the analysis of ECG data obtained in 335 healthy females and 416 healthy males, the chapter shows that compared to males, females have longer QT interval duration especially at slow heart rates while with increasing heart rates, the sex difference in QT duration diminishes. Females also adapt the QT interval to changing heart rate marginally faster than males and have the QT/RR profiles more curved and steeper than males.
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