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# Alpha memo: metformin resistance cross-context evidence signal
**One-sentence alpha:** Preclinical rat insulin-resistance data raise the possibility that metformin adds to swimming training benefits, yet human DARE data suggest metformin may attenuate aerobic-exercise HbA1c gains, framing a cross-context split rather than a clean additive signal.
**Receipt 1:** "Effects Of Metformin Administrati…