Can lifting light weights build muscle like heavy weights?
Resistance Training Load Effects on Muscle Hypertrophy and Strength Gain: Systematic Review and Network Meta-analysis
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Muscle growth was identical across all load ranges when training to failure.
For decades, fitness culture preached that heavy lifting (≤6 reps) was essential for hypertrophy. This study shows that’s not true if you push to failure—light weights can trigger the same muscle growth.
Practical Takeaways
If you want bigger muscles: use any load you like—light, medium, or heavy—as long as you push to failure.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Muscle growth was identical across all load ranges when training to failure.
For decades, fitness culture preached that heavy lifting (≤6 reps) was essential for hypertrophy. This study shows that’s not true if you push to failure—light weights can trigger the same muscle growth.
Practical Takeaways
If you want bigger muscles: use any load you like—light, medium, or heavy—as long as you push to failure.
Publication
Journal
Medicine and Science in Sports and Exercise
Year
2020
Authors
P. Lopez, R. Radaelli, D. Taaffe, R. Newton, D. Galvão, G. Trajano, J. Teodoro, W. Kraemer, K. Häkkinen, R. Pinto
Related Content
Claims (10)
When you lift weights until you can't anymore, you build similar muscle size no matter how heavy the weights are, but lifting heavier weights makes you stronger and faster at moving them than lighter weights.
If you lift weights until you can’t do another rep, your muscles will grow about the same no matter how heavy the weights are—but you’ll get stronger faster if you lift heavier weights.
When people who are already fit push themselves as hard as they can during weight training, it doesn't matter if they lift heavy weights for a few reps or lighter weights for many reps—both ways build muscle about the same.
Lifting lighter weights many times until you can't do any more builds as much muscle as lifting heavy weights a few times in people who already exercise regularly.
If you work out more often, your muscles grow bigger — but only if you keep increasing your workouts, because your body gets used to the same routine and stops responding as well.