Research Article

Stress Detection Using Low Cost Heart Rate Sensors

Table 9

Correlation of observed features during relaxation part.

Mean RRMean HRRMSSDNN50pNN50HRV t.i.LF (ms2)HF (ms2)P.P., SD1

Mean RR1.00
Mean HR−0.991.00
RMSSD0.29−0.281.00
NN500.38−0.370.951.00
pNN500.48−0.470.940.991.00
HRV t.i.0.25−0.250.780.770.751.00
LF (ms2)0.08−0.090.150.170.160.281.00
HF (ms2)0.20−0.20−0.09−0.030.00−0.210.331.00
P.P., SD10.12−0.13−0.010.010.03−0.150.510.891.00