Clue To High Heart Attack Risk In Morning Found

A daily decrease in the flexibility of blood vessels may be the reason that most heart attacks and strokes strike in the early morning. That's the conclusion of a Mayo Clinic study in the June 1 issue of Circulation. "The human body maintains a balance of blood pressure and blood flow by expanding or contracting blood vessels," study leader and cardiologist Dr. Virend Somers said in a prepared statement.

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