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# Alpha memo: caffeine during exercise

## Core signal
Two 1991 athletic-performance studies, both framed around caffeine's pre-exercise ingestion window, diverge in opposite directions under what look like adjacent conditions. Receipt 1 (10.1080/02640419108729851) is a null_signal: 200 mg caffeine ingested 60 min before 60 min of submaximal treadmill work in five males produced no detectable shif…