The Study
Isocaloric High-Intensity Interval and Circuit Training Increases Excess Post-Exercise Oxygen Consumption and Lipid Oxidation Compared to Moderate-Intensity Continuous Training
This study is like a fair race test: 12 fit guys did three different workouts on different days, picked randomly. It shows that harder, shorter workouts burn more calories and fat after the workout ends, compared to a steady, moderate one — but only for an hour after.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
This study checked if hard workouts keep your body burning more energy after they end, compared to easier ones—even when both burn the same during exercise.
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 554 / 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, the difference is meaningful—your body keeps working harder and burning more fat and sugar after intense workouts, even though the workout itself didn’t burn more total energy.
- 2After hard workouts (HIIT or HICT), the body burned more oxygen and more fat and sugar for up to an hour: 319–329 mL extra oxygen, 2.6–2.9 mg/kg/min sugar, and 1.4–1.5 mg/kg/min fat, vs.
- 3168 mL oxygen, 1.25 mg/kg/min sugar, and 0.64 mg/kg/min fat after easy workouts.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Sports
Year
2025
Authors
Viviane Faleiro, Alexandre V Gurgel, Thiago T. Guimarães, T. C. Figueiredo, Felipe G. Teixeira, Bruno Jotta, E. R. Monteiro, Alexandre Meirelles, C. A. Caldas, Maicon T de Almeida, R. Castiglione, Silvio R Marques-Neto
Related Content
Claims (7)
For fit guys, a tough but short workout leads to burning more calories after exercise compared to a longer, easier workout—even if both burn the same total calories. That’s because intense workouts keep your metabolism revved up longer.
After tough workouts like HIIT or circuit training, fit guys burn fat faster in the hour after exercise compared to easier, steady workouts—even though they burn less fat during the actual workout.
If a fit guy burns more carbs during a tough workout, he's likely to burn more fat afterward while recovering.
After a short, high-intensity workout, the body continues to burn calories at a higher rate than at rest for several hours due to increased oxygen consumption.
Doing intense bursts of exercise with rest in between can keep your body burning more calories for up to a whole day after your workout.
After tough workouts like sprint intervals or fast-paced circuit training, fit guys burn more carbs in the hour after exercise compared to easier, steady workouts — which might mean their bodies are working harder to refill energy stores.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.