The Claim
In untrained individuals, the clavicular and sternocostal heads of the pectoralis major muscle can demonstrate similar increases in muscle size in response to resistance training.
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 new to working out, both parts of your chest muscle might grow about the same when you lift weights.
See the scientific wording
The clavicular and sternocostal heads of the pectoralis major can exhibit similar hypertrophic responses to resistance training in untrained individuals.
What the research says
2 studiesThe study found that both upper and lower parts of the chest muscle grew about the same amount after chest exercises in beginners, which supports the claim.
The study found that both upper and lower parts of the chest muscle grow similarly when untrained men do chest exercises, which supports the idea that both parts respond equally to training.
Related videos
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 2 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.