The Claim
In untrained young men, pec deck resistance training does not produce regional hypertrophy differences between the clavicular and sternocostal portions of the pectoralis major.
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.
If you're a young guy who's never lifted weights before and you do pec deck exercises, your upper and lower chest muscles will grow the same amount—no one part gets bigger than the other.
See the scientific wording
In untrained young men, pec deck resistance training does not produce regional hypertrophy differences between the clavicular and sternocostal portions of the pectoralis major.
What the research says
1 studyThe study found that doing pec deck exercises made both the upper and lower parts of the chest muscles grow by about the same amount — so neither part got bigger than the other.
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.