The Claim
In resistance-trained individuals, traditional training with multiple sets at 70% 1RM produces greater increases in muscle thickness than single maximal repetition training over an 8-week period, with mean differences ranging from 0.14 to 0.17 cm across muscle sites.
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.
Among people who regularly lift weights, performing multiple sets of exercises at 70% of their maximum strength leads to larger increases in muscle thickness compared to performing only one maximal repetition set over eight weeks, with measurable differences of 0.14 to 0.17 centimeters across muscle sites.
See the scientific wording
In resistance-trained individuals, traditional training with multiple sets at 70% 1RM produces greater increases in muscle thickness than single maximal repetition training over an 8-week period, with mean differences ranging from 0.14 to 0.17 cm across muscle sites.
Doing several sets of moderate-weight lifts keeps muscles under tension longer, which continuously signals the muscle cells to build more protein, making the muscle fibers thicker over time.
What the research says
1 studyPeople who already lift weights gained more muscle size by doing several lighter lifts than by doing just one super-heavy lift—exactly what the claim says. The study measured the muscle thickness and found the difference was about the size of a paperclip.
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.