Just because someone doesn't gain muscle in one workout phase doesn't mean they never will—everyone eventually gains muscle with enough training over time.
Mechanism
Synthesis from 2 studies
If someone doesn’t grow muscle with light workouts, doing more sets or reps turns on a molecular switch (mTOR-p70S6K) that tells the muscle to build more protein — and this switch can be flipped even in people who didn’t respond before (10.1152/japplphysiol.00670.2023). Studies show that when...
Most probable mechanism
When someone doesn't gain muscle from light training, doing more sets or reps increases the physical stress on muscle fibers, which turns on a molecular signal (mTOR-p70S6K) that tells the muscle to build more protein. This signal is strong enough to overcome the body's initial resistance to growth, allowing muscle to increase even in people who didn't respond before — as shown in people who trained more after failing to grow with less training (10.1152/japplphysiol.00670.2023). Other studies confirm that when people try different training programs over time, nearly everyone eventually gains muscle in major muscle groups, suggesting this mechanism works across different approaches (10.1002/ejsc.70095).
Increased resistance training volume generates greater mechanical tension on skeletal muscle fibers, activating mechanosensitive structures that initiate intracellular signaling (10.1152/japplphysiol.00670.2023).
Mechanical tension triggers activation of the mTORC1 signaling complex, a central regulator of protein synthesis (10.1152/japplphysiol.00670.2023).
Activated mTORC1 phosphorylates p70S6K, enhancing ribosomal biogenesis and the capacity for protein translation (10.1152/japplphysiol.00670.2023).
Elevated translational capacity increases myofibrillar protein synthesis rates, shifting muscle protein balance toward net gain (10.1152/japplphysiol.00670.2023).
Sustained positive protein balance over multiple training phases leads to measurable increases in muscle cross-sectional area, even in individuals who previously showed no response to lower-volume training (10.1152/japplphysiol.00670.2023, 10.1002/ejsc.70095).
Evidence from Studies
Supporting (2)
Community contributions welcome
Higher resistance training volume offsets muscle hypertrophy non-responsiveness in older individuals.
Repeated Resistance Training Reveals the Reproducibility of Muscle Strength and Size Responses Within Individuals
Contradicting (0)
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Gold Standard Evidence Needed
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