Table 1.
Average RR interval and total variance in young and old subjects during different wake-sleep stages.
Figure 1.
Shannon Entropy during wake and sleep.
The graph shows the SE(3) in young (black bars) and in old (grey bars) in wake (W) and during the different sleep stages (S1-1, S3-4 and REM). SE(3) was similar in young subjects between W and the sleep stages. Compared to young, in the old group SE(3) was significantly lower during W, S1-2 and REM. In old subjects, SE(3) was significantly reduced during REM sleep compared to S1-2, S3-4 and W. p<0.05 was considered statistically significant.
Figure 2.
Corrected Conditional Entropy during wake and sleep.
The graph shows the CCEmin in young (black bars) and old subjects (grey bars) during wake (W) and different sleep stages (S1-2, S3-4, REM). In the young subjects, no differences of CCEmin were observed between the sleep stages. Compared to young, the old group showed a significantly lower CCEmin in W, S1-2 and REM. In the old participants, CCEmin was significantly reduced during REM sleep compared to S1-2, S3-4 and W.