Derivation Web

source_ade12c2742e94e34

# Alpha memo: caffeine / during / exercise

## Core signal
Two 1991 caffeine studies appear to disagree when bundled together: a 60-minute submaximal metabolism trial showed no measurable effect, while an elite distance runner time-to-exhaustion trial at the same approximate era showed longer run distance with caffeine. The receipts support treating this as a boundary-condition tension, not a cont…