Bipolar disorder, a condition that causes erratic shifts in mood and activity, affects about 1 percent of Americans. It is often misdiagnosed as depression, largely because the people who suffer from it tend to seek help in their depressive stages, says Claudia Reardon, a psychiatrist and an associate professor of psychiatry at the University of Wisconsin-Madison. Reardon has worked with a handful of bipolar athletes, most notably middle-distance runner Suzy Favor Hamilton.
Also: Shortly after, in mid-December, Shattuck was fired from his job as a senior financial specialist at the University of Wisconsin-Madison. Losing his job hit him hard.