Table 1.
Summary of endogenous circadian parameters.
| Parameter | Sham | Implanted | p |
|---|---|---|---|
| Period τ (hours) | 23.58 ± 0.07 | 23.92 ± 0.06 | <0.01 |
| α (hours) | 13.43 ± 0.90 | 13.08 ± 0.75 | >0.05 |
| Activity in α % | 85.13 ± 1.95 | 83.31 ± 1.89 | >0.05 |
| α/ρ | 1.31 ± 0.28 | 1.17 ± 0.13 | >0.05 |
| V index | 0.69 ± 0.08 | 0.66 ± 0.04 | >0.05 |
| IS index | 0.44 ± 0.03 | 0.31 ± 0.02 | <0.01 |
| IV index | 0.68 ± 0.08 | 1.04 ± 0.1 | <0.05 |
Circadian rhythms of general activity in DD conditions. α, length of the subjective day; ρ, length of the subjective night. See methods for details on V, IS, and IV index calculation. Groups were compared by Student's t-test.