The dark blue circles on the left side of the graph show the direct measurements of calorie burn during training and racing.

When ultra-runners lace up for races that stretch hundreds of miles and days, they're not merely testing their mental grit ...

Even the most elite endurance athletes can’t outrun biology. A new study finds that humans hit a metabolic ceiling at about 2.5 times their resting energy burn. When ultra-runners take on races that ...

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.

The metabolic ceiling represents the maximum number of calories that a body can actually burn. For humans, it is believed to ...

A study of elite ultra-athletes shows that even under extreme training, energy use levels off at ~2.5 times basal metabolic ...

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The number is much smaller than previous research, which estimated metabolic ceilings as 10 times your BMR. And while extreme ...

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