Derivation Web

source_0a696b78c6914ffd

by researka:v2 · 2026-05-25 10:30:33.536735+04:00

# Alpha memo — exercise

**Headline:** Exercise: single-source alpha signal
**Alpha score:** 100/100 (internal triage score; not a certainty claim)
**Confidence:** `evidence_backed_signal`
**Memo surface:** `alpha memo`
**Snapshot:** `2026-05-25T06-25-13Z`
**Run:** `exercise-evidence-2026-05-25T06-25-13Z`
**Source thesis:** Anatomical site-specific effects of impact exercise on cortical and trabecular bone density: Implications for targeted osteoporosis prevention
**Source scope:** This memo is derived from one cited source: Effects of Moderate- to High-Impact Exercise Training on Bone Structure Across the Lifespan: A Systematic Review and Meta-Analysis of Randomized Controlled Trials (Journal of Bone and Mineral Research, 2023) DOI `10.1002/jbmr.4899`.

## One-sentence thesis

Within the cited source bundle, Impact exercise improved cortical thickness at the mid/proximal radius (MD = 1.78% [95% CI 0.21, 3.36%]); Impact exercise improved trabecular vBMD at the distal tibia (MD = 0.54% [95% CI 0.17, 0.90%]); Impact exercise improved total vBMD at the proximal femur (MD = 3.11% [95% CI 1.07, 5.14%]). Treat the broader framing as a follow-up hypothesis, not a settled claim.

## Why this is surprising

The signal is not a broad topic claim; it is a source-bounded contrast that identifies a specific replication target. The value is the falsifiable pattern inside one cited bundle, not a claim that the pattern is already settled across the field.

## Evidence receipts

- `fact_id=183056` (`A_core`) — Impact exercise improved cortical thickness at the mid/proximal radius (MD = 1.78% [95% CI 0.21, 3.36%]). DOI `10.1002/jbmr.4899`
- `fact_id=183054` (`A_core`) — Impact exercise improved trabecular vBMD at the distal tibia (MD = 0.54% [95% CI 0.17, 0.90%]). DOI `10.1002/jbmr.4899`
- `fact_id=183055` (`A_core`) — Impact exercise improved total vBMD at the proximal femur (MD = 3.11% [95% CI 1.07, 5.14%]). DOI `10.1002/jbmr.4899`

## What this changes

Treat this as a narrow, single-source signal. It changes the next curation step: test the same contrast in independent receipts before making a broader topic claim.

## Limitations

- This is an alpha memo, not a settled review, guideline, or broad consensus claim.
- Interpret the thesis only within the cited receipt bundle and the explicit weakening checks below.
- An independent source fails to reproduce the same contrast.
- The cited source depends on a narrow protocol, subgroup, comparator, or measurement choice.
- Broader receipts show the same topic behaves differently outside the cited source bundle.

## What would weaken this

- An independent source fails to reproduce the same contrast.
- The cited source depends on a narrow protocol, subgroup, comparator, or measurement choice.
- Broader receipts show the same topic behaves differently outside the cited source bundle.

## Strongest counter-evidence

- _No A_core/B_context counter-evidence found in this run; treat this as a single-direction signal until a broader receipt expansion finds a real opposing fact._

## Next extraction

- Add independent A_core/B_context receipts that test the thesis directly.

## Provenance / priority

- **Topic:** `exercise`
- **Author:** Dom Lynch
- **ORCID:** _not configured_
- **Version:** 1.0
- **License:** CC BY-NC 4.0
- **Canonical URL:** _not assigned_
- **Suggested citation:** Dom Lynch. (2026). Exercise: single-source alpha signal. ReseaRka Evidence Index. Version 1.0.
- **Run bundle SHA-256:** `d3c86678a38db99c09c3099772ad5fd5852b3a6b322b971f3f584f9104c7a1a9`
- **Memo SHA-256:** `36259a60ff4398f21249465be2775bcb88990c1ca32e576c8be1a421c5dc6cb7`
- **Priority note:** This memo records the first published framing, source bundle, and evidence receipts for this run. Reuse should cite the canonical version.

{
  "article_type": "alpha_memo",
  "domain_slug": "general",
  "researka_object_type": "submission",
  "researka_submission_id": "2c5a6941-465b-4117-919f-03342f6d2aea",
  "title": "Exercise: single-source alpha signal"
}