Research Article

Effect of Color Light Stimulation Using LED on Sleep Induction Time

Table 2

Change of HRV according to awake-asleep state in case of experiment 1 (; awake versus asleep).

Experiment 1 ()Experiment 2 ()
AwakeAsleepAwakeAsleep

Mean R-R (ms)862.22 ± 51.47907.87 ± 53.38885.73 ± 42.37931.44 ± 44.28
SDNN (ms)34.82 ± 7.342.85 ± 6.540.59 ± 4.4239.41 ± 4.54
rMSSD (ms)1.55 ± 8.6640.91 ± 10.3028.21 ± 5.7837.64 ± 8.15
pNN50 (%)1.96 ± 7.769.27 ± 9.619.94 ± 6.6718.46 ± 8.36
LF/HF ratio (%)1.57 ± 0.581.19 ± 0.281.63 ± 0.521.26 ± 0.29