Fig. 3: Summary of results: comparison between the 2 x 2 x 4 and 4 x 4 x 4 schedules.
From: Bridging the gap: examining circadian biology and fatigue alongside work schedules
The “2 x 2 x 4” schedule showed increased nocturnal sleep time after diurnal work, decreased sleep regularity and higher levels of insomnia. Additionally, this shift exhibited increased fatigue impact, lower alertness levels during the night shift, and heightened symptoms of depression. The “2 x 2 x 4” schedule exhibited lower circadian robustness only when compared to the “fixed 12 h schedule”. However, the “4x4x4” schedule did not significantly differentiate from either of the other groups.
