The Claim
Muscle hypertrophy resulting from high-resistance strength training is associated with increases in the cross-sectional area of whole muscles and individual muscle fibers, driven by greater myofibrillar size and number.
What the research says
Roughly balanced
Support and challenge are close. The picture may shift as more studies come in.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
When you lift heavy weights regularly, your muscles get bigger because the individual muscle fibers inside them grow thicker and more numerous.
See the scientific wording
Muscle hypertrophy from high-resistance strength training is associated with increases in the cross-sectional area of whole muscles and individual muscle fibers, driven by greater myofibrillar size and number.
What the research says
1 studyStudy: Morphological and Neurological Contributions to Increased Strength
This study shows that lifting heavy weights makes muscles bigger by increasing the number and size of the tiny contractile parts inside muscle fibers, which is exactly what the claim says.
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.