Derivation Web

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# Alpha memo: caffeine during exercise

## Core signal
A 1991 null result on 200 mg pre-exercise caffeine coexists with a 1991 positive result on 10 mg·kg⁻¹ caffeine taken immediately pre-exercise. Both are framed as effects of caffeine during exercise, yet they point in divergent directions under different ingestion windows, dosages, subject pools, and exhaustion endpoints.

## The 2+2=5 angle
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