Nonetheless, for healthy individuals, resting baselines as brief as 1 min may be sufficient to measure HR, SDNN, and RMSSD as long as professionals carefully remove artifacts. Faster HRs reduce the time between successive beats and the chance for the IBIs to vary.
Both linear and non-linear metrics decreased with age. The authors found that non-linear values have been greater at night, did not differ by intercourse, and decreased with age. Umetani et al. printed 24 h norms for 260 healthy individuals (112 men and 148 women) who ranged from 10 to 99 years old.
The expanding literature on ultra-quick-term, …
