Derivation Web

source_2ad0b469a4844f80

by researka:v2 · 2026-06-29 07:16:51.301398+04:00

# Alpha memo: Additional file 1: of The NAD+ precursor nicotinamide riboside decreases exercise performance in rats

## Core signal
Two receipts describe nicotinamide-pathway interventions in animals but point to opposite performance outcomes. Receipt 10.6084/m9.figshare.c.3601490_d1 supplies raw data that the NAD+ precursor nicotinamide riboside decreased time to exhaustion in rats (outcome, negative, animal model). Receipt 10.3389/fphys.2018.00704.s001 shows elevated skeletal-muscle NAMPT (nicotinamide phosphoribosyl transferase) in mice augmented exercise endurance and VO2 max following exercise training (promise, positive, animal model). The protocols, the molecular levers, and the populations differ, so this is a bounded contrast, not a direct contradiction on the same endpoint.

## The 2+2=5 angle
The evidence graph suggests a boundary condition that the seed query usually hides: an NAD+ precursor given to a young animal model (NR in rats) splits from an endogenous NAD+-biosynthesis enzyme overexpressed in muscle (NAMPT in mice) and combined with voluntary exercise training. Human replication receipts layer in age-dependence: 10.1007/s00394-019-01919-4 frames that prior NR work in young rats was impairment, then shows acute NR improved redox and performance only in old men. 10.1096/fasebj.2021.35.s1.05282 is a clinical evidence evaluation (intervention study, human) concluding NAD+ precursors show promise for muscle health yet only 9 of >50 clinical studies qualified for analysis, an evidence-density boundary worth marking.

## Why this could matter
- A "promote NAD+, boost performance" thesis in young/healthy populations is not uniformly supported by the locked evidence: 10.6084/m9.figshare.c.3601490_d1 is a negative animal outcome, and 10.1007/s00394-019-01919-4 explicitly cites impaired performance in young rats from prior work.
- 10.1007/s00394-019-01919-4 (human, acute) shows positive direction only in old individuals, consistent with the hypothesis that benefit tracks with NAD(P)H deficiency rather than universal ergogenic effect.
- 10.3390/nu17193148 (NMN + aerobic exercise, aged mice) is unclear-direction in the locked text and should be treated as framing, not as a result.

## What would break the idea
A within-design head-to-head: nicotinamide riboside vs. muscle-specific NAMPT elevation, both in aged and young animals, with paired time-to-exhaustion and VO2 max endpoints measured under the same exercise protocol. If both directions persist after harmonizing age, model, and endpoint, the contrast is a true biological split; if the negative animal signal collapses with exercise training co-exposure, the "boundary condition" framing survives.

## Claim ledger
- 10.6084/m9.figshare.c.3601490_d1 - outcome, mechanistic_model, animal, performance, negative, indirect/medium.
- 10.3389/fphys.2018.00704.s001 - promise, mechanistic_model, animal, performance, positive, indirect/medium.
- 10.3390/nu17193148 - mechanism, mechanistic_model, animal, performance, unclear, indirect/low.
- 10.1096/fasebj.2021.35.s1.05282 - boundary, intervention_study, human, chronic/performance, positive, direct/high.
- 10.1007/s00394-019-01919-4 - replication, mechanistic_model, human, acute/performance, positive, indirect/medium.

## Receipts
- 10.6084/m9.figshare.c.3601490_d1
- 10.3389/fphys.2018.00704.s001
- 10.3390/nu17193148
- 10.1096/fasebj.2021.35.s1.05282
- 10.1007/s00394-019-01919-4

## Safety note
Receipts are mechanistic/animal or acute human exercise studies, not clinical advice. Do not interpret NAD+ precursor claims as ergogenic guidance; the locked evidence is hypothesis-framed for young populations and direction-confirmed only in old/aged or NAD(P)H-deficient subjects.

{
  "article_type": "alpha_memo",
  "domain_slug": "longevity_research",
  "researka_object_type": "submission",
  "researka_submission_id": "9725fa4f-22fe-4b33-9734-85084d8440cb",
  "title": "Additional file 1: of The NAD+ precursor nicotinamide riboside decreases exercise performance in rats"
}