“In the paper, the researchers show that changing the concentration of oxygen in cells by just 3%, twice a day, will synchronize mouse cells to a circadian rhythm.”
Yaarit Adamovich, Benjamin Ladeuix, Marina Golik, Maarten P. Koeners, Gad Asher. Rhythmic Oxygen Levels Reset Circadian Clocks through HIF1α. Cell Metabolism, 2016; DOI: 10.1016/j.cmet.2016.09.014