After 12 weeks of training with blood-flow restricted resistance exercise, the release of certain signaling proteins (IL-4, IL-7, and irisin) into the bloodstream during a subsequent workout is lower...
Mechanism
Synthesis from 1 study
After training, muscles get better at handling the stress of exercise, so they don't need to send out as many chemical signals during the same workout. This means less inflammation and growth signaling is released, because the muscle doesn't need to repair or rebuild as much as it did before.
Most probable mechanism
After training, muscles don't need to release as many signaling proteins during the same workout because they've become more efficient at handling stress, so less inflammation and growth signals are sent out.
Resistance exercise under blood flow restriction causes mechanical strain and metabolic stress in skeletal muscle fibers, triggering intracellular signaling pathways associated with cellular damage and energy depletion.
In untrained individuals, this stress activates transcriptional and secretory programs in muscle cells that release IL-4, IL-7, irisin, IL-6, and LIF into circulation as part of a coordinated adaptive response.
These myokines promote muscle remodeling by activating satellite cells via STAT3 signaling, enhancing protein synthesis through mTOR, upregulating IGF-1, and suppressing myostatin to support hypertrophy.
After 12 weeks of repeated training, muscle cells adapt by improving metabolic efficiency, reducing accumulation of metabolic byproducts, and stabilizing cellular structures, leading to diminished activation of stress-responsive signaling pathways.
As a result, the same exercise stimulus elicits a reduced secretion of IL-4, IL-7, and irisin, reflecting a lower demand for inflammatory and hypertrophic signaling due to prior adaptation.
Evidence from Studies
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