EFFECTS OF GENDER AND AGE ON HEART-RATE-VARIABILITY IN HEALTHY-INDIVIDUALS AND IN PERSONS AFTER SUDDEN CARDIAC-ARREST

The purpose of this study was to describe the effects of gender and ag e on heart rate variability (HRV) in healthy volunteers (n = 111; 40 m en and 71 women) and in persons after sudden cardiac arrest (SCA) (n = 95; 79 men and 16 women). Frequency-domain measurements and six time- domain measurements of HRV (SDANN, 24-hour SD, SD, RMSSD, RR50, and %R R50) were taken. Two-factor analysis of variance was performed. In gen eral, HRV was significantly lower in healthy women compared with healt hy men in all the time-domain and frequency-domain variables except fo r the high-frequency components, RMSSD, RR50, and %RR50. There were no significant gender differences in the SCA sample. All the time-domain and frequency-domain measurements decreased with age in the healthy s ample, but only the frequency-domain measurements decreased with age i n the SCA sample.