Tea and coffee could reduce blood flow to the heart during exercise, particularly at altitude, Swiss research has suggested. A group of 18 healthy young volunteers had their myocardial blood flow measured by PET before and after using an exercise bike. They repeated the test after taking 200mg of caffeine, equivalent to two cups of coffee. Eight people exercised in a low-pressure chamber to simulate altitude. Myocardial flow reserve was reduced by 22 per cent and 39 per cent at reduced pressure (www.cardiosource.com).
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