Athletes helped by weekly 50,000 IU Vitamin D – RCT

Created August 2019

Efficacy of Vitamin D supplementation in physical performance of Iranian elite athletes

Karamollah Alimoradi1, Bahareh Nikooyeh2, Ali Asghar Ravasi3, Maliheh Zahedirad2, Nastaran Shariatzadeh2, Ali Kalayi2, Tirang Reza Neyestani2

This study would have found much more benefit it any of the following:1. Study lasted ~ 8 weeks (note: periodic dosing often not plateau until 6 months)1. Add cofactors which increase the response to the vitamin D (e.g. Magnesium, Omega-3)1. Add activators for the Vitamin D Receptor (exampls:e high intensity exercise, Resveratrol)Note: For some health problems weekly dosing is BETTER than daily (Vitamin D Receptor)* One pill every two weeks gives you all the vitamin D most adults need* Sub section of that page has a summary of weekly 50K Vitamin D, which includes the study on this page 1. Overview Sports and vitamin D has the following summary{include} 1. Sports category starts with{include}

📄 Download the PDF from Vitamin D Life

Vitamin D Levels got to 42 ng in 8 weeks, but suspect levels were only high enough to be of some benefit for last 3 weeks

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Background: There has been no report of the vitamin D status of the professional athletes from Iran to date. This study was performed to evaluate the efficacy of weekly vitamin D supplementation on athletic performance in Iranian athletes expedited to Asian competition in Taipei, China, 2015.

Methods: This study was a randomized controlled clinical trial. Seventy subjects were enrolled in the study. The athletes were randomly divided into two groups: vitamin D supplement (D; received 50,000 IU of vitamin D supplement weekly) and control (P, received a placebo weekly). Duration of the study was 8 weeks. Anthropometric, dietary, athletic performance, and biochemical evaluations were performed for all subjects in the beginning and in the end of the intervention period.

Results: A significant rise in circulating 25(OH)D concentration was observed in D group (17.3 ± 16.9 ng/mL, P < 0.001), whereas in P group, there was a statistically significant decrement (−3.1 ± 8.4 ng/mL, P = 0.040). There were no either within- or between-group significant differences in Ergo jump, vertical jump, and agility tests. In strength leg press tests, both groups showed a significant improvement. However, comparisons of changes revealed that the improvement in D group was significantly higher than in P group (P = 0.034). Moreover, in sprint test (one repetition-Max, 1RM), only D group had a significant within-group improvement (P = 0.030).

Conclusions: Weekly supplementation with 50,000 IU vitamin D resulted in nearly 17 ng/mL increment in circulating calcidiol. This increase was associated with significant improvement of power leg press and sprint tests in D-supplemented group.

D2 not good - clipped from PDF

"a research group found that 6 weeks vitamin D 2 (ergocalciferol) supplementation in National Association for Stock Car Auto Racing pit crew athletes not

only decreased serum concentrations of 25(OH) D3 by 21% but resulted in augmented muscular damage biomarkers, as well.[47]"

Tags: Intervention Intervention - non daily Sports