Article: Cycles of Life

Little fluctuations in the daily rhythms of the human body can make a big difference when it comes to health BY SUSAN PERRY

FOR THE PAST 4O YEARS, Bob Sothern has been the guinea pig in a medical test of his own making. Five times a day, he stops whatever he's doing to measure his temperature, blood pressure, heart rate, respiration, and several other biological functions. He also charts his mood, time perception, hand-eye coordination, and physical vigor. He then records all the data for later analysis.

It's a tedious routine, but one that has become second nature to Sothern, a research associate in the College of Biological Sciences at the University of Minnesota. He's a pioneer in the ...

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