Fragile fibers and hidden oxidation: Why your body refuses to build new muscle

Researchers from Kyushu University have discovered that sarcopenia—the age-associated loss of muscle mass—is not solely a consequence of sedentary behavior but rather a chemical interference in cellular repair signals. The study reveals that hepatocyte growth factor, a crucial protein for activating satellite cells responsible for repairing muscle fibers, undergoes a nitration process. This structural alteration prevents muscle cells from detecting growth signals, nullifying the effects of routine physical loads. The Role of Trisulfides in Protein Protection The scientific team evaluated the impact of sulfur-based compounds, specifically lipoic acid and glutathione trisulfides, in cellular environments that mimic aging. The data indicate that lipoic acid trisulfide halts nitration and doubles the protein's affinity for its cellular receptors. This mechanism not only preserves the recovery signal but enhances it beyond the standard levels recorded in young tissues. "Many attribute muscle flaccidity to lack of willpower, but it often stems from a biological failure. If the signaling proteins are damaged, the tissue simply does not respond to the usual loads," explains Pavel Kuznetsov, home training instructor, to Pravda.Ru.