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Table 1 HRV feature trends

From: Ultra-short term HRV features as surrogates of short term HRV: a case study on mental stress detection in real life

HRV Features 5 min 3 min 2 min 1 min 30 sec
MeanNN ↓↓ ↓↓ ↓↓ ↓↓ ↓↓
StdNN ↓↓ ↓↓ ↓↓ ↓↓ ↓↓
MeanHR ↑↑ ↑↑ ↑↑ ↑↑ ↑↑
Std HR ↑↑ ↑↑ ↑↑ ↑↑ ↑↑
RMSSD
NN50
pNN50
LF ↓↓ ↓↓ ↓↓
HF ↓↓ ↓↓ ↓↓ ↓↓
LF/HF ↓↓ ↓↓ ↓↓
TotPow ↓↓ ↓↓ ↓↓
SD1
SD2 ↓↓ ↓↓ ↓↓ ↓↓ ↓↓
ApEn ↓↓ ↓↓
SampEn ↓↓ ↓↓ ↓↓ ↓↓
D2 ↓↓ ↓↓ ↓↓ ↓↓
dfa1 ↓↓ ↓↓ ↓↓ ↓↓
dfa2
RPlmean ↑↑ ↑↑ ↑↑
RPlmax ↓↓ ↓↓
REC ↑↑ ↑↑ ↑↑
RPadet ↑↑
ShanEn ↑↑ ↑↑ ↑↑ ↑↑
  1. Trend ↓↓ (↑↑): significantly lower (higher) under stress (p < 0.05), ↓(↑) lower (higher) under stress (p > 0.05), − not computable