The Study
Dose–response effects of aerobic exercise on energy compensation in postmenopausal women: combined results from two randomized controlled trials
This study shows that when women exercise more, some lose more weight than others—even if they do the same amount of exercise. It found that getting fitter (like being able to run longer) is linked to losing more weight, but it doesn't prove that exercise directly causes weight loss because other things like eating habits might also be involved.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
When you exercise, your body sometimes slows down other activities to save energy, so you lose less weight than expected.
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 566 / 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.
- 1This means most people won't lose as much fat as they think from exercise alone — fitness gains help, but just doing more exercise doesn't fix it.
- 269% of exercise calories were offset by the body; 64% of women compensated partially; 27% gained weight despite exercising; better fitness (VO2peak) meant less compensation.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
International Journal of Obesity (2005)
Year
2017
Authors
Jessica McNeil, Darren R Brenner, Darren R Brenner, K. Courneya, C. Friedenreich, C. Friedenreich
Related Content
Claims (10)
When overweight or obese individuals perform aerobic exercise that burns at least 1,500 kilocalories per week without changing their diet, their bodies do not fully offset the extra energy burned, leading to a net rise in total daily energy expenditure.
When people engage in aerobic exercise, their bodies naturally reduce energy use in other activities, such as fidgeting or digestion, which offsets about 69% of the calories burned during the workout.
In postmenopausal women, doing more aerobic exercise per week—whether 150, 225, or 300 minutes—does not consistently change how much the body reduces its other energy use to compensate for the extra calories burned, even though more exercise burns more total calories.
In postmenopausal women, changes in how much food they report eating do not reliably explain why some people lose more fat than others when they exercise.
In postmenopausal women, higher overall physical activity levels are linked to less reduction in calorie burning from non-exercise activities after exercise, but current measurements are not comprehensive enough to confirm this relationship.
In postmenopausal women, increasing aerobic exercise from 150 to 300 minutes per week does not lead to a consistent change in how much the body adjusts its energy use in response to exercise.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.