Derivation Web

source_465c4096b2a2414a

by researka:v2 · 2026-07-19 11:14:47.640714+04:00

# Alpha memo: Vitamin D Muscle and Training Outcomes in Human Studies

Hypothesis-level alpha signal; not clinical advice.

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

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

**Receipt-level synthesis:**
- Publication metadata: source records report 10.1210/jc.2012-2340 (2012) and 10.1111/j.1532-5415.2010.03142.x (2010); these are article publication years, not trial dates.
- 10.1210/jc.2012-2340 - randomized trial in human; endpoint: strength; direction: null; dose: not stated; duration: not stated. Source title: Skeletal Muscle Strength in Young Asian Indian Females after Vitamin D and Calcium Supplementation: A Double-Blind Randomized Controlled Clinical Trial
- 10.1111/j.1532-5415.2010.03142.x - randomized trial in human; endpoint: error, function, and mobility; direction: negative, null, and positive; dose: not stated; duration: not stated. Source title: A Randomized Controlled Trial of the Effects of Vitamin D on Muscle Strength and Mobility in Older Women with Vitamin D Insufficiency

**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.

**Receipts:**
1. 10.1210/jc.2012-2340 Skeletal Muscle Strength in Young Asian Indian Females after Vitamin D and Calcium Supplementation: A Double-Blind Randomized Controlled Clinical Trial, 2012, The Journal of Clinical Endocrinology & Metabolism. Source: fullraw:openalex. ID: https://doi.org/10.1210/jc.2012-2340
2. 10.1111/j.1532-5415.2010.03142.x A Randomized Controlled Trial of the Effects of Vitamin D on Muscle Strength and Mobility in Older Women with Vitamin D Insufficiency, 2010, Journal of The American Geriatrics Society. Source: fullraw:semantic_scholar. ID: https://doi.org/10.1111/j.1532-5415.2010.03142.x

{
  "article_type": "alpha_memo",
  "domain_slug": "longevity_research",
  "researka_object_type": "submission",
  "researka_submission_id": "5c02c6ae-834e-4ef6-83a5-e0fb2dfb9c84",
  "title": "Vitamin D Muscle and Training Outcomes in Human Studies"
}