The Claim
Mechanical tension generated during resistance training is the primary driver of skeletal muscle hypertrophy in humans, as it activates mechanotransductive signaling pathways (e.g., mTORC1, FAK, YAP/TAZ) that stimulate myofibrillar protein accretion, independent of metabolic or hormonal cues.
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 weights, the pulling force on your muscles is what makes them grow bigger—not because of hormones or feeling tired, but because your muscles sense the tension and respond by building more muscle fibers.
See the scientific wording
Mechanical tension generated during resistance training is the primary driver of skeletal muscle hypertrophy in humans, as it activates mechanotransductive signaling pathways (e.g., mTORC1, FAK, YAP/TAZ) that stimulate myofibrillar protein accretion, independent of metabolic or hormonal cues.
What the research says
1 studyStudy: Load-induced human skeletal muscle hypertrophy: Mechanisms, myths, and misconceptions
This study says lifting weights creates tension in muscles, and that tension—not sweat or hormones—is what actually makes muscles grow bigger. It says other popular ideas about muscle growth are just myths.
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.