Intense exercise causes temporary proteinuria.This is probably caused by an increase in permeability of the nephron's filtration membrane.

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Intense exercise can cause temporary proteinuria due to the increased permeability of the filtration membrane in the nephrons. This allows for small amounts of protein to pass through into the urine, but it is usually not a cause for concern unless it persists long after exercise.

Intense Exercise Causes Temporary Proteinuria