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The researchers suggest that they need to study dark chocolate for its effects on prolonged exercise. In this case, they were saying for 2.5 hours of cycling at 60% maximal oxygen concentration. While chocolate may help you exercise longer, I'm not too worried about that for you. It's far more important that the chocolate appears to make exercise easier.
Maybe this is why my exercise tolerance has held about the same for the past 10 years. I eat dark chocolate regularly, a few ounces most days. Of course it's organic and limited in sugar. One of my very few dietary vices, but not a bad one to have, it seems.
Dark chocolate is loaded with cocoa bioflavonoids, which may have a key protective effect on your vascular endothelial cells. If you must have a dietary vice, this is the one to have (smile).