In healthy young men, two different resistance training methods—training until muscle failure or using blood flow restriction with mixed intensities—produce similar increases in thigh muscle size...
Mechanism
Synthesis from 1 study
Your muscles grow bigger whether you lift heavy until you can't anymore or lift light with bands squeezing your legs—because both ways turn on the same internal signals that tell your muscle cells to make more protein. The bands make your muscles swell with waste products, and heavy lifting...
Most probable mechanism
When you lift weights until you're exhausted, your muscles are stretched and squeezed hard, which turns on signals that tell your muscle cells to build more protein. When you lift light weights with bands around your legs, your muscles get tired and swollen from built-up waste products, which also turns on those same signals. Either way, your muscle cells end up making more protein and getting bigger.
High-threshold motor units are recruited under high mechanical tension during resistance exercise, generating force that strains muscle fibers
Low-intensity resistance training with blood flow restriction causes metabolite accumulation (lactate, H+, inorganic phosphate) and cellular swelling due to restricted venous outflow
Mechanical tension and metabolic stress independently activate intracellular anabolic signaling pathways, including mTOR and MAPK
Activated anabolic signaling increases the rate of muscle protein synthesis beyond breakdown, resulting in net protein accretion
Accumulated protein accretion leads to enlargement of myofibrils and increased muscle fiber cross-sectional area
Less supported by current evidence, but not ruled out
The connective tissue wrapping around the muscle gets thicker when you train, which may help hold the growing muscle fibers in place and improve how force is transferred.
Repetitive mechanical loading during resistance training applies strain to the fascia surrounding the vastus lateralis
Mechanical strain activates fibroblasts in the fascia, stimulating collagen synthesis and extracellular matrix deposition
Increased fascial thickness may provide structural support for hypertrophying muscle fibers and influence force transmission
Evidence from Studies
Supporting (1)
Community contributions welcome
Contradicting (0)
Community contributions welcome
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.