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Human trials

Measuring fuel use over one day

Exercise Increases 24-h Fat Oxidation Only When It Is Performed Before Breakfast

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Fasting Free source summary: https://fastingfree.com/education/iwayama-2015-fat-oxidation/

PLAIN-LANGUAGE SUMMARY

What it found

Pre-breakfast exercise increased 24-hour fat oxidation in this experiment.

Keep these limits in view

Meal state and clock time differed together. This measured fuel use, not a long-term change in body fat.

Understand the context

Evidence type
Randomized repeated-measures laboratory experiment
Population or scope
Healthy young men
Sample or coverage
10 participants
Study duration or data period
Four separate 24-hour calorimetry conditions
Comparison
Cycling before breakfast, after lunch or after dinner, and a sedentary condition; energy balance controlled.
Measured outcomes
Measured energy expenditure and substrate oxidation.

Research terms in this source

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