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Elite Athletes Hit Metabolic Ceiling at 2.5x Resting Burn

10/27/2025

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Summary

Story summary

A Current Biology study finds elite endurance athletes reach a metabolic ceiling at about 2.5 times resting energy burn.
Researchers tracked 14 ultra-runners, cyclists, and triathletes during competitions, with some burning up to 8,000 calories daily.
Over time, the long-term caloric burn returned to the ceiling, suggesting the body conserves energy elsewhere.
Lead author Andrew Best notes that exceeding this limit is challenging and can lead to tissue breakdown.

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Story summary

A Current Biology study finds elite endurance athletes reach a metabolic ceiling at about 2.5 times resting energy burn.
Researchers tracked 14 ultra-runners, cyclists, and triathletes during competitions, with some burning up to 8,000 calories daily.
Over time, the long-term caloric burn returned to the ceiling, suggesting the body conserves energy elsewhere.
Lead author Andrew Best notes that exceeding this limit is challenging and can lead to tissue breakdown.