The Study
Lack of alpha(2)-adrenergic antilipolytic effect during exercise in subcutaneous adipose tissue of trained men.
We don't know if this study was done fairly, like flipping a coin to decide who gets what treatment. So we can't say for sure that training changes how your body burns fat — it might, but we just don't know from this study.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
When you exercise, your body breaks down fat for energy. This study found that people who train regularly break down more fat from their belly during exercise than people who don't train — even though their body doesn't release more fat-burning hormones.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 538 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — this means trained people’s fat cells become better at ignoring signals that normally stop fat burning, so they burn more fat during workouts without needing more hormones.
- 2Trained men had higher fat breakdown (glycerol) during exercise than untrained men.
- 3Giving a blocker (phentolamine) made untrained men break down even more fat — but didn't change anything in trained men.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Journal of applied physiology
Year
2001
Authors
I. de Glisezinski, F. Marion-Latard, F. Crampes, M. Berlan, J. Hejnová, J. Cottet-Emard, V. Štich, D. Rivière
Related Content
Claims (6)
In men who are endurance-trained, blocking a specific receptor (α2-adrenergic) does not increase fat breakdown during exercise in abdominal fat, but it does increase fat breakdown in men who are not trained, suggesting that endurance training reduces the effect of this receptor in limiting fat breakdown.
Men who regularly train for endurance sports show greater fat breakdown in abdominal fat tissue during moderate cycling than untrained men, measured by higher glycerol levels, even when hormone levels like adrenaline and insulin are similar.
People who regularly do endurance exercise, like running or cycling, show increased fat breakdown in abdominal fat tissue during exercise, even when levels of key hormones in the blood do not change. This suggests the fat tissue itself adapts to exercise rather than relying on hormonal signals.
During exercise, a biological signal that normally slows fat breakdown has less effect in people who are endurance-trained compared to those who are not, suggesting that training changes how fat tissue responds to this signal.
Fat cells in the lower abdomen have more alpha-2 receptors than beta receptors, which makes them less responsive to signals that trigger fat breakdown.
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.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.