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Table 1 HRV Time domain parameters evaluated in PD patients and controls

From: Impaired circadian heart rate variability in Parkinson’s disease: a time-domain analysis in ambulatory setting

VariablesDescription (unit)
SDNN 24Standard deviation (SD) of all NN intervals (ms)
SDNN D
SDNN N
pnn50 24Percentage of successive RR intervals that differ by more than 50 ms (%)
pnn50 D
pnn50 N
rMSS 24Root mean square of successive RR interval differences (ms)
rMSS D
rMSS N
SDANNStandard deviation of the average NN intervals for each 5 min segment of a 24 h HRV recording (ms)
ISDNNMean of the Standard deviation of all NN intervals for all 5 min segments of the entire recording (ms)
  1. PD Parkinson’s disease, D day, N: night