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Stroke risk 'peaks twice in the day'18 August 2006 The risk of stroke peaks during two two-hour periods each day, according to recent research. Scientists in Japan claim the risk of suffering a stroke is highest between 06:00 and 08:00 and then 18:00 and 20:00 every day, although stroke risk is at its lowest during sleep. The team of researchers from the Iwate Medical University studied 13,000 patients who had suffered one of three different types of stroke. Cerebral infarction, the most common type, is caused by restricted blood flow to the brain. The two other types of stroke, subarachnoid haemorrhage and intracerebral haemorrhage, occur when there is bleeding in or on the brain. Writing in the Journal of Neurology, Neurosurgery and Psychiatry, the scientists found that cerebral infarction occurred more often in the morning and slightly less in the evening. Subarachnoid and intracerebral haemorrhage showed less of a peak in morning compared to the evening. They suggest that fluctuating blood pressure could be the cause of these changes in stroke risk, with previous research suggesting that blood pressure tends to be highest during the morning, peaking again in the evening. More information
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