US scientists have found why heart attacks and strokes occur in the early hours most often.

According to the Emory University researchers daily rhythms in the activity of those cells which line blood vessels can be the key factor in this connection.

The researchers found that these cells activity was at its lowest during the early hours of the morning.

The study has been presented to an American Heart Association conference and it seems to suggest that low cells activity make c less able to relax and it raises the risk of problems.

Endothelial progenitor cells from the bone marrow are considered playing an important role in maintaining the lining of the blood vessels.

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