When insulin is present, it tells muscle cells to pump more sodium and potassium around, which creates a better environment for the cell to pull in more creatine — a compound that helps muscles store energy.
Evidence from Studies
Supporting (5)
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Effect of insulin upon membrane‐bound (Na+ + K+)‐ATPase extracted from frog skeletal muscle.
The study shows insulin boosts a key cellular pump in muscle that helps move sodium and potassium, which supports the idea that it could help cells take in more creatine.
Role of Serine/Threonine Protein Phosphatases in Insulin Regulation of Na+/K+-ATPase Activity in Cultured Rat Skeletal Muscle Cells*
The study shows insulin turns on a molecular pump in muscle cells that moves sodium and potassium, which could help bring more creatine into the cells. This supports the idea that insulin helps muscles take up creatine.
ERK1/2 Mediates Insulin Stimulation of Na,K-ATPase by Phosphorylation of the α-Subunit in Human Skeletal Muscle Cells*
The study shows that insulin boosts a key cellular pump in muscle cells that helps move sodium and potassium, which creates conditions that should help creatine get into cells more effectively.
Regulatory effect of insulin on the structure, function and metabolism of Na+/K+-ATPase (Review)
The study shows insulin helps boost a cellular pump in muscle that moves sodium and potassium, which matches part of the claim, but it doesn’t test how this affects creatine getting into cells.
Insulin makes a sodium-potassium pump in frog muscle work harder, which means more sodium is pushed out — this is exactly the kind of pump that helps creatine get into muscle cells.
Contradicting (2)
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Effects of Electrical Stimulation and Insulin on Na+–K+‐ATPase ([3H]Ouabain Binding) in Rat Skeletal Muscle
The study shows insulin helps muscle cells move potassium and sodium better, but it doesn’t increase the number of ‘pumps’ in the cell membrane. This contradicts the idea that insulin boosts these pumps directly.
Creatine uptake in isolated soleus muscle: kinetics and dependence on sodium, but not on insulin.
The study looked at whether insulin helps muscles take in more creatine and found that insulin didn't make a difference, even though sodium is important for the process.
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.