Heavy or Light Weights? Both Can Grow Muscles the Same Way
The Effects of Low-Load Vs. High-Load Resistance Training on Muscle Fiber Hypertrophy: A Meta-Analysis
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Low-load training may be just as effective as high-load for muscle fiber growth—despite decades of advice saying heavy weights are essential.
Most fitness culture, textbooks, and even ACSM guidelines promote 70–85% 1RM as optimal for hypertrophy. This study says: maybe not—if you go to failure.
Practical Takeaways
If you hate heavy lifting or have joint issues, try training with lighter weights (40–60% 1RM) taken to failure—your quads might grow just as well.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Low-load training may be just as effective as high-load for muscle fiber growth—despite decades of advice saying heavy weights are essential.
Most fitness culture, textbooks, and even ACSM guidelines promote 70–85% 1RM as optimal for hypertrophy. This study says: maybe not—if you go to failure.
Practical Takeaways
If you hate heavy lifting or have joint issues, try training with lighter weights (40–60% 1RM) taken to failure—your quads might grow just as well.
Publication
Journal
Journal of Human Kinetics
Year
2020
Authors
J. Grgic
Related Content
Claims (10)
If you push your muscles as hard as you can until you can't do any more reps, that's what really makes them grow bigger. It doesn't matter how many reps you do, as long as you're giving your absolute best effort.
Lifting lighter weights with more reps might make your slow-twitch muscles grow bigger than lifting heavier weights with fewer reps.
Lifting light or heavy weights until failure doesn’t clearly make your fast-twitch muscle fibers bigger in your thighs — the data is too mixed to say one is better.
We just don’t know yet if light or heavy weights make muscles grow better — the results could swing either way in future studies, so we need more research.
All the studies looked only at thigh muscles — so we don’t know if the same results would apply to arms, shoulders, or calves.