TO STOP himself from "hitting the wall", elite cyclist Chris Froome took a rule-breaking sugar gel during his bid to be this year's Tour de France champion. It cost him a 20-second penalty. But perhaps he won't need last-minute snacks if he gets a tattoo before next year's race. A new biosensor, worn like a temporary tattoo, offers athletes early warning that their energy supply systems are struggling - a sign that extreme fatigue is approaching. During intense activity, aerobic metabolism may be unable to provide the body with all of its energy needs.
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