A small shift in the oxygen levels in the air could act as a "reset" button for the biological clock, according to a new study in mice. Mice in the study that were exposed to a brief dip in the levels of oxygen in the air that they were breathing adjusted more quickly to a new circadian rhythm than mice that received steady levels of oxygen, the researchers found. In other words, the dip in oxygen levels seemed to help the animals adjust to the mouse equivalent of jet lag, according to the study, which was published today (Oct. 20) in the journal Cell Metabolism.
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