The Claim
In resistance-trained adults, performing single-set resistance training to muscular failure for 8 weeks, twice weekly, is associated with modestly greater increases in muscle thickness of the biceps brachii, triceps brachii, and quadriceps femoris compared to training with two repetitions in reserve.
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.
In adults who regularly lift weights, doing one set of exercises until muscle fatigue for 8 weeks twice a week results in slightly larger increases in biceps, triceps, and quadriceps muscle thickness than doing the same exercises while stopping two repetitions before fatigue.
See the scientific wording
In resistance-trained adults, performing single-set resistance training to muscular failure for 8 weeks, twice weekly, is associated with modestly greater increases in muscle thickness of the biceps brachii, triceps brachii, and quadriceps femoris compared to training with two repetitions in reserve, though differences are not statistically decisive and may not be clinically meaningful.
When muscles are pushed to complete fatigue, more muscle fibers are activated and forced to work harder, creating stronger physical stress and buildup of metabolic byproducts. This triggers the muscle to build more protein and grow thicker over time.
What the research says
1 studyFor people who already lift weights, doing one set of each exercise until you can't do another rep might help your muscles grow just a tiny bit more than stopping two reps early — but the difference is so small that it might not matter in real life.
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.