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Table 2 Electrocardiogram and blood pressure parameters.

From: Association of cardiac and vascular changes with ambient PM2.5 in diabetic individuals

Heart rate variability (HRV) (24 h): time domain
RMSSD Root mean square of successive differences
SDNN Standard deviation of NN (normal-to-normal)
pNN50 Percentage of adjacent NN-intervals which differ more than 50 ms
Heart rate variability (HRV) (5 min at rest): frequency domain
HR Heart rate
TP Total power (approximately = 0.40 Hz)
LFa Low frequency band (0.04-0.15 Hz)
HFa High frequency band (0.15-0.40 Hz)
LF/HF Low-to-high frequency power ratio
Repolarization events (5 min at rest)
QTc Bazett-corrected QT interval (correction: QT/sqrt(NN))
QT norm Normalized QT variance
QTVI QT variability index
T wave amplitude Amplitude of T wave
T wave complexity Principal component analysis of T wave
Variability of T wave complexity Standard deviation of T wave complexity
Blood pressure
BPsys Systolic blood pressure
BPdia Diastolic blood pressure
  1. aRepresented as absolute values of power (unit: ms2) and as the relative value of each power component in proportion to total power minus the very low frequency component (unit: normalized units)