{"publication_id":"a0900cba-0a00-4208-88a9-1b1711cbdbd3","content_hash":"sha256:0260935905d352af50f081f52564b44126cbd3ca22eede5fc632e24eb82c2041","nodes":[{"id":"a0900cba-0a00-4208-88a9-1b1711cbdbd3","type":"publication","title":"caffeine / during / exercise"},{"id":"claim_1","type":"claim","text":"Two 1991 caffeine studies appear to disagree when bundled together: a 60minute submaximal metabolism trial showed no measurable effect, while an elite distance runner timetoexhaustion trial at the same approximate era showed longer run distance with caffeine. The receipts support treating this as a boundarycondition tension, not a contradiction on the same metric."},{"id":"claim_2","type":"claim","text":"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 contradiction on the same metric."},{"id":"claim_3","type":"claim","text":"For elite endurance, where time-to-exhaustion is the operationally relevant endpoint, the positive-signal receipt suggests caffeine ingested just prior to exercise can extend work capacity. For submaximal steady-state work under the null-signal receipt's design, the metabolic readout does not change. The actionable read is that caffeine's lever may depend on the proximity to exhaustion rather than on average metabolism."},{"id":"claim_4","type":"claim","text":"A within-subject crossover in elite distance runners that pairs time-to-exhaustion with continuous metabolic sampling (RER, FFA, lactate) across the same 10 mg·kg⁻¹ dose would resolve whether the metabolism null is real or a sensitivity-floor artifact of the 1991 submaximal design."},{"id":"claim_5","type":"claim","text":"10.1080/02640419108729851 — null_signal: 200 mg caffeine, 60 min pre-exercise, 5 males, 60% MHR, no significant metabolic differences."},{"id":"source_1","type":"source","study":"Failure of caffeine to affect metabolism during 60 min submaximal exercise.","year":1991,"doi":"10.1080/02640419108729851","url":"https://doi.org/10.1080/02640419108729851","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary"},{"id":"source_2","type":"source","study":"Caffeine ingestion during exercise to exhaustion in elite distance runners. Revision.","year":1991,"doi":null,"url":"","population":"not extracted","intervention_or_exposure":"not extracted","comparator":"not extracted","endpoint":"not extracted","effect":"not extracted","risk_of_bias":"not appraised in public sidecar","directness":"primary"}],"edges":[{"from":"a0900cba-0a00-4208-88a9-1b1711cbdbd3","to":"claim_1","type":"contains_claim"},{"from":"a0900cba-0a00-4208-88a9-1b1711cbdbd3","to":"claim_2","type":"contains_claim"},{"from":"a0900cba-0a00-4208-88a9-1b1711cbdbd3","to":"claim_3","type":"contains_claim"},{"from":"a0900cba-0a00-4208-88a9-1b1711cbdbd3","to":"claim_4","type":"contains_claim"},{"from":"a0900cba-0a00-4208-88a9-1b1711cbdbd3","to":"claim_5","type":"contains_claim"}],"screening":{"identified":2,"screened":2,"excluded":0,"included":2,"included_or_retained":2,"flow":["identified","screened","excluded_with_reasons","included"],"wording":"2 candidate receipts retained after source retrieval, deduplication, and topic filtering. This is an evidence-map screening trace, not a PRISMA full-text exclusion audit.","exclusion_reasons":["No PRISMA full-text exclusion-stage filter was applied."]}}