Why your muscles run out of fuel during weightlifting
Acute effects of resistance exercise on skeletal muscle glycogen depletion: A systematic review and meta‐analysis
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Higher lifting intensity reduces glycogen depletion
Everyone assumes lifting heavier = more energy used. But this study shows heavier weights mean fewer reps and less total volume, so less sugar burned.
Practical Takeaways
If you do 8+ sets per muscle group or mix heavy/light sets, eat 30–50g of fast carbs within 30 minutes post-workout.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Higher lifting intensity reduces glycogen depletion
Everyone assumes lifting heavier = more energy used. But this study shows heavier weights mean fewer reps and less total volume, so less sugar burned.
Practical Takeaways
If you do 8+ sets per muscle group or mix heavy/light sets, eat 30–50g of fast carbs within 30 minutes post-workout.
Publication
Journal
Physiological Reports
Year
2025
Authors
Amin Hamidvand, Slaheddine Delleli, J. Rothschild, Farzaneh Chenaghchi, A. Jafari, A. Naderi
Related Content
Claims (10)
Changing the weight you lift during a workout burns more muscle sugar than lifting the same weight the whole time.
People who don’t lift weights regularly burn more sugar from their muscles during a workout than people who lift regularly.
After a weightlifting workout, the main leg muscle loses a lot of its stored sugar energy—about 21% on average—which can make you feel tired and affect how well you do in your next workout.
People who don’t lift weights regularly lose more muscle sugar during a workout than those who train regularly—likely because their bodies are less efficient at using energy.
The more sets you do when lifting weights, the more sugar your muscles burn through.