The Claim
In moderately resistance-trained individuals, when training volume is equated, machine-based exercises (hack squat, chest press) produce greater strength gains than free-weight compound lifts (squat, bench press), and this difference is attributable to exercise familiarity being a stronger determinant of strength adaptation than movement complexity.
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 with moderate resistance training experience, using weight machines leads to greater increases in strength than using free weights when the total amount of work is the same, because familiarity with the movement matters more than how complex the movement is.
See the scientific wording
In moderately resistance-trained individuals, strength gains are greater in machine-based exercises (hack squat, chest press) than in free-weight compound lifts (squat, bench press) when training volume is equated, suggesting exercise familiarity may be a stronger determinant of strength adaptation than movement complexity.
When a person performs a movement they have done many times before, their brain sends stronger and more precise signals to the muscles, causing more muscle fibers to activate at once, which makes them stronger faster.
What the research says
1 studyWhen people who already lift weights train the same amount, they get stronger faster on machines like the hack squat because they’ve used them more often — not because machines are better, but because they’re more familiar with them.
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.