When muscles contract during exercise, special sugar transporters called GLUT4 move from inside the muscle cells to the outer surface, helping sugar get inside to provide energy.

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Evidence from Studies

Supporting (1)

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Exercise, GLUT4, and skeletal muscle glucose uptake.

Narrative Review

2013 Jul

The study confirms that when muscles contract during exercise, GLUT4 proteins move from storage inside the cell to the cell surface and T-tubules, allowing glucose to enter the muscle cells - exactly as the claim describes.

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No contradicting evidence found

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Source Study

Exercise, GLUT4, and skeletal muscle glucose uptake.

Score: 1

DOI: 10.1152/physrev.00038.2012

Similar Assertions

After losing weight, muscles get better at using sugar not because they make more GLUT4 proteins, but because the existing proteins move to the right place or work better.

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Your muscles need a special door (GLUT4) to let glucose in for energy. When you need energy right now, your body quickly moves these doors to the surface. But if you exercise regularly, your muscles build more of these doors as a long-term change.

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