When athletes devote large amounts of energy to running or cycling, they unconsciously cut back on energy output elsewhere.

The research, published today in Current Biology, showed that ultramarathoners can burn an astounding 11,000 calories per day ...

While ultramarathoners are capable of huge energy spurts, overall the athletes top out at 2.5 times the metabolic rate needed for basic body functions.

Two physicists at the University of Stuttgart have proven that the Carnot principle, a central law of thermodynamics, does ...