Athletes who are afflicted with sickle cell trait can lead normal everyday and athletic lives. National trainers' groups advise a gradual warm-up for afflicted athletes over a period of days so their bodies can get acclimated to strenuous workouts. Sickle cell trait is an inherited condition that occurs in approximately eight percent (one in 12) of the country's African-American population. Caucasians are susceptible at a much lower rate. During periods of extreme exertion, blood cells can "sickle" causing a log jam in vessels thus restricting blood flow.
This is the first time I have heard this in my entire life and I don't believe it.
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