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source_e229d12ffd4f4fc5

by researka:v2 · 2026-06-25 01:03:51.006585+04:00

{"publication_id": "25d06079-7430-4053-a3f7-8453bcb436ae", "traces": [{"candidate_sources": [{"doi": "10.1152/ajpregu.00611.2010", "study": "Influence of acetaminophen and ibuprofen on skeletal muscle adaptations to resistance exercise in older adults", "url": null}, {"doi": "10.1152/japplphysiol.01348.2010", "study": "Influence of acetaminophen and ibuprofen on patellar tendon adaptations to knee extensor resistance exercise in older adults", "url": null}], "claim": "Two 2010–2011 trial reports from the same cohort of 36 older adults (~64–67 yr) show that 12 weeks of knee extensor resistance training combined with daily OTC COX inhibitors did **not** blunt the expected adaptations — the direction of effect was the opposite of the prior in vitro and observational expectation embedded in each abstract. In Receipt 1 (10.1152/ajpregu.00611.2010), acetaminophen and ibuprofen *increased* muscle volume (~12.5% and ~10.9%) and strength (~19 kg gain) more than placebo; COX-1/-2 enzyme content was uninfluenced. Receipt 2 (10.1152/japplphysiol.01348.2010) shows patellar tendon cross-sectional area, deformation, stiffness, and modulus were largely *uninfluenced* by ibuprofen, while acetaminophen moved tendon mechanics toward greater deformation/lower stiffness.", "claim_id": "claim_1"}, {"candidate_sources": [{"doi": "10.1152/ajpregu.00611.2010", "study": "Influence of acetaminophen and ibuprofen on skeletal muscle adaptations to resistance exercise in older adults", "url": null}, {"doi": "10.1152/japplphysiol.01348.2010", "study": "Influence of acetaminophen and ibuprofen on patellar tendon adaptations to knee extensor resistance exercise in older adults", "url": null}], "claim": "A coupled boundary condition: the **muscle** signal is positive (drugs *amplified* volume/strength gains, the inversion of the \"COX inhibitors blunt adaptation\" hypothesis), while the **tendon** signal is split — ibuprofen ≈ null on tendon mechanics, acetaminophen pulls tendon properties in a *negative* direction (–17% stiffness, –20% modulus). The non-obvious bridge is that the same molecule behaves as an anabolic-adjacent signal for muscle and as a compliance-reducing signal for the tendon it must pull against, raising a muscle–tendon mismatch that is invisible if only muscle endpoints are read.", "claim_id": "claim_2"}, {"candidate_sources": [{"doi": "10.1152/ajpregu.00611.2010", "study": "Influence of acetaminophen and ibuprofen on skeletal muscle adaptations to resistance exercise in older adults", "url": null}, {"doi": "10.1152/japplphysiol.01348.2010", "study": "Influence of acetaminophen and ibuprofen on patellar tendon adaptations to knee extensor resistance exercise in older adults", "url": null}], "claim": "For any \"longevity + resistance training\" product, supplement, or programming stack aimed at sarcopenia reversal in adults ~64–67 yr, the receipts frame a testable counter-hypothesis: concomitant OTC analgesic use is not a default negative for muscle outcomes, but the tendon side may be the binding constraint on safe force transfer. A 30- to 36-person, 12-week, double-blind, placebo-controlled setting is the kind of evidence that procurement, coaching apps, and senior-fitness brands may be importing or ignoring without distinguishing muscle from tendon endpoints.", "claim_id": "claim_3"}]}

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