Why does you feel stiff when taking muscle training
When the muscle contraction, especially static nature (equilong) contraction, the blood flow in muscle is temporarily blocked, energy metabolism mainly in form of anaerobic glycolysis,and produce large amounts of lactic acid. The accumulation of lactic acid stimulated the sensory nerve endings, through the nerves upload it to the brain, causing a sense of muscle soreness. When the muscle relaxation, the local accumulation and stimulation of acidic products, microvascular expansion, the muscles get more energy, help muscle recover and grow.
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