The Claim
When training volume and effort are equated, compound exercises involving greater total muscle mass do not produce greater hypertrophy in target muscles than isolation exercises.
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.
When the total amount of work and effort are the same, exercises that use multiple muscle groups do not cause more muscle growth in the target muscles than exercises that focus on one muscle group.
See the scientific wording
Compound exercises involving greater total muscle mass do not produce superior hypertrophy in target muscles compared to isolation exercises when training volume and effort are equated.
When muscles are worked to the same level of effort and total work, the amount of growth depends on how much tension and burn those specific muscles feel during the exercise, not on how many other muscles are involved in the movement.
What the research says
3 studiesEven if one exercise uses more muscles, if you do the same number of reps and push just as hard, your muscles grow the same size — this study shows that.
Even though squats work more muscles overall, they didn’t make your butt grow bigger than hip thrusts did—when both exercises were done the same number of times and with the same effort.
When people do the same amount of total work, whether they lift heavy with few reps or lighter with many reps using big multi-muscle exercises, their muscles grow about the same. This suggests that using single-muscle exercises won’t necessarily make muscles bigger if the total effort is equal.
Related videos
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 3 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.