Muscle Strength improved 1.4 to 19 percent by vitamin D3 (not D2) – systematic review
Effects of Vitamin D Supplementation on Muscle Strength in Athletes A Systematic Review.
J Strength Cond Res. 2016 Jun 28.
Chiang CM1, Ismaeel A, Griffis RB, Weems S.
Nutrition Sciences, Baylor University, Waco, Texas; and 2English, Baylor University, Waco, Texas.
The purpose of this systematic review of the literature was to investigate the effects of vitamin D supplementation on muscle strength in athletes. A computerized literature search of three databases (PubMed, Medline, and Scopus) was performed. Included in the review were randomized controlled trials, published in English, which measured serum vitamin D concentrations and muscle strength in healthy, athletic participants ages 18-45 years old. Quality was assessed using the PEDro scale.
Five randomized controlled trials and one controlled trial were identified, and quality assessment showed five trials were of 'excellent quality' and one was of 'good quality.' Trials lasted from 4 weeks to 6 months and dosages ranged from 600 IU to 5000 IU per day .
VitaminD2 was found to be ineffective at impacting muscle strength in both studies wherein it was administered
. In contrast, vitamin D3 was shown to have a positive impact on muscle strength. In two studies, strength outcome measures were significantly improved following supplementation (p < 0.05).
In the other two studies administering vitamin D3, there were trends for improved muscle strength. Specifically, improvements in strength ranged from 1.37% to 18.75% . Additional studies are needed to confirm these associations.
📄 Download the PDF from VitaminDWiki
Suspect that most of the benefits were associated with high dose vitamin D
Sports and Vitamin D contains:
{include}
{include}