After exercise, increased insulin levels change the body's metabolism from breaking down molecules to building them up.
Mechanism
Synthesis from 1 study
After exercise, rising insulin levels tell muscle cells to stop burning energy and start storing it. It opens the door for glucose to enter the muscle and get turned into fuel reserves, while also slowing down the breakdown of muscle and fat. This turns the body from a state of energy use into...
Most probable mechanism
After exercise, when insulin levels rise, it tells muscle cells to stop breaking down energy and start storing glucose as fuel. Insulin activates a chain of signals that pull glucose from the blood into muscle cells, where it gets turned into glycogen for storage. This switch stops the breakdown of muscle protein and fat, shifting the body from a state of energy use to energy storage.
Elevated insulin levels bind to insulin receptors on skeletal muscle cells, triggering autophosphorylation of the receptor and activation of downstream signaling kinases.
Activated insulin signaling promotes the dephosphorylation and activation of AS160, which releases inhibition on Rab GTPases involved in GLUT4 vesicle trafficking.
GLUT4 glucose transporters translocate from intracellular vesicles to the plasma membrane, increasing glucose uptake into muscle cells.
Increased intracellular glucose is phosphorylated and directed into glycogen synthesis pathways, replenishing muscle energy stores.
Insulin suppresses proteolytic and lipolytic pathways, reducing the breakdown of muscle protein and stored fat.
The combined effect of enhanced glucose storage and suppressed catabolic processes shifts the metabolic state from energy mobilization to energy conservation and tissue repair.
Evidence from Studies
Supporting (1)
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Seeking the Mechanism for Reversal of Enhanced Insulin Sensitivity after Acute Exercise
Contradicting (0)
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