A study at the University of Virginia showed that a majority of elderly mice died while being subjected to the equivalent of a Washington-to-Paris flight once a week for eight weeks.
More intense forms of jet lag sped up the death rate in the elderly rodents, the study found.
In the study, younger mice seemed to rebound more quickly and were not immediately harmed by the jet lag. Simulated jet lag conditions were created by advancing and delaying the rodent's exposure to light.
Seventeen percent of the mice in a control group died in the eight-week study.
Researchers aren't sure what conclusions to draw from the results.
[Edited 2006-12-26 08:02:16]