Women have faster normal heart rates than men, according to The Foundation for Gender-Specific Medicine. Men have larger hearts than women, and there is a difference between the heart's electrical system in men and in women. Electrocardiograms differ between the two genders.
Girls as young as 5 years old show evidence of the difference between heart rates of women and men, explains Cleveland Clinic. In addition, the sinus node refractory time is shorter in women than it is in men. This means the SA node, a specialized cell cluster that regulates heartbeat rhythms, recovers and is ready to pulse again more quickly in women than the SA node in men. The gender difference in heart rates and electrocardiograms may be due to the difference between androgen and estrogen levels in men and women.