The Claim
When training volume and intensity are matched, free-weight and machine-based strength training produce equivalent muscle hypertrophy, as indicated by a standardized mean difference of -0.055 and a p-value of 0.751, demonstrating no significant difference in total muscle growth between the two methods.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
If you lift weights the same amount and with the same effort, whether you use free weights or machines, you’ll grow your muscles just as much—neither one is better than the other for building muscle size.
See the scientific wording
Free-weight and machine-based strength training produce equivalent muscle hypertrophy (SMD: -0.055, p=0.751), indicating that total muscle growth is not significantly influenced by whether resistance is provided via free weights or machines when training volume and intensity are matched.
What the research says
1 studyThis study found that lifting free weights and using machines lead to about the same amount of muscle growth, as long as you lift the same amount of weight and work just as hard. So, it doesn’t really matter which one you pick if your goal is just to get bigger muscles.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.