The Claim
Endurance training has no effect on the systemic hormonal response to moderate-intensity exercise, as plasma concentrations of norepinephrine, epinephrine, and insulin during exercise do not differ between trained and untrained men, and enhanced lipolysis in trained individuals is not mediated by changes in these circulating hormones.
What the research says
Challenges is higher
Challenge is ahead, but a single strong supporting study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
People who regularly do endurance exercise have the same levels of norepinephrine, epinephrine, and insulin in their blood during moderate exercise as people who do not train, and the increased fat breakdown seen in trained individuals is not caused by differences in these hormone levels.
See the scientific wording
Endurance training does not alter the systemic hormonal response to moderate-intensity exercise, as plasma norepinephrine, epinephrine, and insulin levels during exercise are similar between trained and untrained men, indicating that enhanced lipolysis is not driven by changes in circulating hormones.
What the research says
1 studyEven though trained people have the same hormone levels as untrained people during exercise, they burn more fat — not because of hormones, but because their fat cells become less sensitive to a signal that normally stops fat burning. So the claim is wrong: hormones aren’t the reason trained people burn more fat.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.