In untrained men aged 25 to 70, performing resistance exercises with restricted blood flow for 12 weeks leads to a 32% increase in overall strength and a 30% increase in strength relative to lean...
Mechanism
Synthesis from 1 study
Working muscles under restricted blood flow triggers the release of natural signals that wake up muscle repair cells and tell them to grow bigger. These signals also turn up protein building and turn down natural brakes on growth, allowing muscles to get stronger even with light weights.
Most probable mechanism
When muscles are worked under restricted blood flow, they experience stress that causes them to release special signaling molecules. These molecules wake up muscle repair cells, make them multiply, and help them fuse into existing muscle fibers, making them bigger. At the same time, these signals tell the muscle to build more protein and reduce natural brakes on growth. Over time, this makes the muscles stronger without needing heavy weights.
Low-load resistance exercise performed under vascular restriction induces mechanical and metabolic stress in skeletal muscle fibers.
Stressed muscle cells secrete interleukin-4 (IL-4), interleukin-6 (IL-6), leukemia inhibitory factor (LIF), and irisin into the bloodstream.
IL-4, IL-6, and LIF activate the STAT3 signaling pathway in satellite cells, promoting their proliferation and migration toward existing muscle fibers.
IL-6, LIF, and irisin enhance activation of the mTOR pathway, increasing the rate of muscle protein synthesis.
Irisin upregulates insulin-like growth factor-1 (IGF-1) expression and suppresses myostatin, removing inhibition on muscle growth and further stimulating satellite cell activity and myoblast fusion.
Increased satellite cell recruitment, fusion with myotubes, and elevated protein synthesis lead to muscle fiber hypertrophy and improved strength relative to fat-free mass.
Evidence from Studies
Supporting (1)
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