Why your muscles grow (and what doesn't help)
Load-induced human skeletal muscle hypertrophy: Mechanisms, myths, and misconceptions
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Your muscles get bigger when you lift weights and pull on them hard over time—not because you feel the burn or your hormones spike.
No biological mechanisms were identified in this study. This may be an epidemiological, observational, or survey-based study that reports associations rather than proposing causal biological pathways.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
Max 44Case Reports & Case Series
Max 30Expert Opinion & Narrative Reviews
Max 51 / 5
Evidence Score
Based on clinical experience or non-systematic literature reviews. The lowest level of evidence as they are most susceptible to bias and personal perspective.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Your muscles get bigger when you lift weights and pull on them hard over time—not because you feel the burn or your hormones spike.
No biological mechanisms were identified in this study. This may be an epidemiological, observational, or survey-based study that reports associations rather than proposing causal biological pathways.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
Max 44Case Reports & Case Series
Max 30Expert Opinion & Narrative Reviews
Max 51 / 5
Evidence Score
Based on clinical experience or non-systematic literature reviews. The lowest level of evidence as they are most susceptible to bias and personal perspective.
Publication
Authors
Van Every DW, Lees MJ, Wilson B, Nippard J, Phillips SM
Related Content
Claims (10)
Muscle growth occurs mainly due to the tension placed on muscles and the buildup of metabolic byproducts during exercise, not simply because of how heavy the weights are.
Your muscles grow bigger mainly because of how much total force they feel over time—not whether you do your workouts all at once or spread out over the week.
Your muscles grow bigger mainly because of how much total force they feel over time—not whether you do your workouts all at once or spread out over the week.
When you lift weights and your muscles grow, all the tiny parts inside the muscle cells grow together in balance — so the overall mix inside the cell stays the same.
When you lift weights, it's the pulling force on your muscles—not the tears or burn—that makes them grow bigger, and scientists think a specific molecular signal inside the muscle cells is behind this growth; other things like soreness or muscle burn probably don't cause the growth on their own.