The Claim
In untrained individuals, the hypertrophic response to resistance training is similar between exercises performed with strict form and those performed with external momentum, despite the latter enabling greater volume load and recruitment of ancillary musculature.
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.
For people new to weight training, muscle growth in the biceps and triceps occurs at a similar rate whether lifting with controlled form or using momentum, even though momentum allows heavier loads and engages more surrounding muscles.
See the scientific wording
In untrained individuals, the hypertrophic response to resistance training is similar whether performing biceps curls and triceps pushdowns with strict form or with external momentum, even though momentum allows greater volume load and recruits ancillary musculature, suggesting that target muscle stimulation may be preserved despite reduced isolation.
When you lift weights, whether slowly or with a swing, your muscles still stretch and contract under load. This stretch and pull on the muscle fibers triggers signals inside the cells that tell them to grow bigger over time. It doesn’t matter if other muscles help or if you lift heavier with a swing — as long as the main muscle is being pulled hard enough, it will grow.
What the research says
1 studyFor beginners, lifting weights with a little swing or help from momentum grows your biceps and triceps just as much as lifting slowly and carefully—even though you can lift heavier with the swing. Your muscles don’t care how you lift, as long as you work them hard.
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.