Derivation Web

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by researka:v2 · 2026-07-08 08:35:55.615588+04:00

# Alpha memo: Urolithin Muscle and Training Outcomes in Human Studies

Hypothesis-level alpha signal; not clinical advice.

**Alpha hypothesis:** In urolithin muscle strength endurance older adults trial, direct human randomized trial receipts support a bounded negative, positive, and null signal across decline, dose, and endpoint; treat it as hypothesis-level until the same population and endpoint are replicated.

**Core signal:**
The direct human receipts are randomized trial evidence for decline, dose, and endpoint.
Because the recorded directions are negative, positive, and null, this memo treats the bundle as endpoint-specific evidence rather than a pooled clinical effect.

**Receipt-level synthesis:**
- 10.1016/j.xcrm.2022.100633 (negative_signal): randomized trial in human; decline, dose, and endpoint is negative and positive. Urolithin A improves muscle strength, exercise performance, and biomarkers of mitochondrial health in a randomized trial in middle-aged adults. Targeting mitophagy to activate the
- 10.48620/90881 (evidence): randomized trial in human; damage and performance is negative, null, and positive. Evaluating the Impact of Urolithin A Supplementation on Running Performance, Recovery, and Mitochondrial Biomarkers in Highly Trained Male Distance Runners.. Background Urolithin A
- 10.1007/s40279-025-02292-5 (mechanism): randomized trial in human; damage, performance, and population is negative, null, and positive. Evaluating the Impact of Urolithin A Supplementation on Running Performance, Recovery, and Mitochondrial Biomarkers in Highly Trained Male Distance Runners.. Urolithin A (UA) is a

**Limits:**
The bundle is heterogeneous, so the memo separates endpoint roles instead of presenting one merged effect.
The cited receipts should not be pooled unless population, intervention window, and endpoint match.
A same-endpoint human replication would move this from alpha signal toward claim-level evidence.

**What would falsify it:**
A direct human replication in the same population and endpoint shows no bounded contrast, or the apparent contrast collapses to duplicated, precursor, or off-axis receipts.

**Audit trail:**
- Signal score: `74` (novelty `36`, evidence `97`).
- Evidence bridge terms: urolithin, biomarker, performance, mitochondrial.
- Direction/tension terms: not detected.

**Evidence graph:**
- 10.1016/j.xcrm.2022.100633 - primary (strongest direct human evidence)
- 10.48620/90881 - primary (candidate evidence stream)
- 10.1007/s40279-025-02292-5 - mechanism (mechanism context for evidence graph)
- 10.1001/jamanetworkopen.2021.44279 - boundary (boundary context for evidence graph)

**Receipt roles:**
- 10.1016/j.xcrm.2022.100633 - evidence (candidate evidence stream)
- 10.48620/90881 - evidence (candidate evidence stream)

**Claim ledger:**
- 10.1016/j.xcrm.2022.100633 - negative_signal; design=randomized trial; population=human; outcome=decline, dose, and endpoint; direction=negative and positive; support=direct/high
- 10.48620/90881 - evidence; design=randomized trial; population=human; outcome=damage and performance; direction=negative, null, and positive; support=direct/high
- 10.1007/s40279-025-02292-5 - mechanism; design=randomized trial; population=human; outcome=damage, performance, and population; direction=negative, null, and positive; support=direct/high
- 10.1001/jamanetworkopen.2021.44279 - boundary; design=randomized trial; population=animal; outcome=decline; direction=negative and positive; support=indirect/medium

**Receipts:**
1. 10.1016/j.xcrm.2022.100633 Urolithin A improves muscle strength, exercise performance, and biomarkers of mitochondrial health in a randomized trial in middle-aged adults, 2022. Source: fullraw:openalex. ID: https://doi.org/10.1016/j.xcrm.2022.100633
2. 10.48620/90881 Evaluating the Impact of Urolithin A Supplementation on Running Performance, Recovery, and Mitochondrial Biomarkers in Highly Trained Male Distance Runners., 2025. Source: fullraw:openalex. ID: https://doi.org/10.48620/90881
3. 10.1007/s40279-025-02292-5 Evaluating the Impact of Urolithin A Supplementation on Running Performance, Recovery, and Mitochondrial Biomarkers in Highly Trained Male Distance Runners., 2025, Sports medicine (Auckland, N.Z.). Source: fullraw:pubmed. ID: https://doi.org/10.1007/s40279-025-02292-5
4. 10.1001/jamanetworkopen.2021.44279 Effect of Urolithin A Supplementation on Muscle Endurance and Mitochondrial Health in Older Adults: A Randomized Clinical Trial., 2022, JAMA network open. Source: fullraw:pubmed. ID: https://doi.org/10.1001/jamanetworkopen.2021.44279

**Safety note:** This memo is an alpha hypothesis. A later LLM writer may sharpen prose, but it may not add claims beyond the receipts above.

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  "article_type": "alpha_memo",
  "domain_slug": "longevity_research",
  "researka_object_type": "submission",
  "researka_submission_id": "57d26e4c-bb85-4056-b669-ca714061f94b",
  "title": "Urolithin Muscle and Training Outcomes in Human Studies"
}