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Colds substantially reduced by Vitamin D or UV during military training – Jan 2021

Influence of Vitamin D Supplementation by Simulated Sunlight or Oral D3 on Respiratory Infection during Military Training

Medicine & Science in Sports & Exercise: doi: 10.1249/MSS.0000000000002604
Harrison, Sophie E.1; Oliver, Samuel J.1; Kashi, Daniel S.1,2; Carswell, Alexander T.1,3; Edwards, Jason P.1,2; Wentz, Laurel M.1,4; Roberts, Ross1; Tang, Jonathan C. Y.3; Izard, Rachel M.5,6; Jackson, Sarah7; Allan, Donald8; Rhodes, Lesley E.9; Fraser, William D.3,10; Greeves, Julie P.3,7,11; Walsh, Neil P.2

VitaminDWiki

1,000 IU of vitamin D daily for 4 weeks then 400 IU daily for 8 weeks

Note by VitaminDWiki:
  probably get similar benefit by taking a 50,000 IU capsule once a month

Increasing the dose frequency to bi-weekly has been proven to prevent/treat 18 other health problems and is expected to reduce incidence of COVID-19

 Download the PDF from VitaminDWiki
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Purpose
To determine the relationship between vitamin D status and upper respiratory tract infection (URTI) of physically active men and women across seasons (study 1). Then, to investigate the effects on URTI and mucosal immunity of achieving vitamin D sufficiency (25(OH)D ≥50 nmol·L-1) by a unique comparison of safe, simulated-sunlight or oral D3 supplementation in winter (study 2).

Methods
In study 1, 1,644 military recruits were observed across basic military training. In study 2, a randomized controlled trial, 250 men undertaking military training received either placebo, simulated-sunlight (1.3x standard erythemal dose, three-times-per-week for 4-weeks and then once-per-week for 8-weeks) or oral vitamin D3 (1,000 IU·day-1 for 4-weeks and then 400 IU·day-1 for 8-weeks). URTI was diagnosed by physician (study 1) and Jackson common cold questionnaire (study 2). Serum 25(OH)D, salivary secretory immunoglobulin A (SIgA) and cathelicidin were assessed by LC-MS/MS and ELISA.

Results
In study 1, only 21% of recruits were vitamin D sufficient during winter. Vitamin D sufficient recruits were 40% less likely to suffer URTI than recruits with 25(OH)D <50 nmol·L-1 (OR (95% CI) = 0.6 (0.4–0.9)); an association that remained after accounting for sex and smoking. Each URTI caused on average 3 missed training days. In study 2, vitamin D supplementation strategies were similarly effective to achieve vitamin D sufficiency in almost all (≥95%). Compared to placebo, vitamin D supplementation reduced the severity of peak URTI symptoms by 15% and days with URTI by 36% (P < 0.05). These reductions were similar with both vitamin D strategies (P > 0.05). Supplementation did not affect salivary SIgA or cathelicidin.

Conclusion
Vitamin D sufficiency reduced the URTI burden during military training.


Created by admin. Last Modification: Monday January 25, 2021 01:24:32 GMT-0000 by admin. (Version 4)

Attached files

ID Name Comment Uploaded Size Downloads
14914 Oral UV.jpg admin 25 Jan, 2021 01:21 132.33 Kb 123
14913 Vitamin D, Simulated Sunlight RTI, military.pdf PDF 2021 admin 24 Jan, 2021 23:02 2.17 Mb 68
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