Chiang, Chien-ming; Ismaeel, Ahmed; Griffis, Rachel B.; Weems, Suzy
Journal of Strength & Conditioning Research. AN: 00124278-900000000-96407.ACCEPTANCE, 28 June 2016
Overview Sports and vitamin D has the following summary
Athletes are helped by vitamin D by:
- Faster reaction time
- Far fewer colds/flus during the winter
- Less sore/tired after a workout
- Fewer micro-cracks and broken bones
- Bones which do break heal much more quickly
- Increased VO2 and exercise endurance Feb 2011
- Indoor athletes especially need vitamin D
- Professional indoor athletes are starting to supplement with vitamin D or use vitamin D beds
- Olympic athletes have used UV/vitamin D since the 1930's
- The biggest gain from the use of vitamin D is by those who exercise less than 2 hours per day.
- Reduced muscle fatigue with 10,000 IU vitamin D daily
- Muscle strength improved when vitamin D added: 3 Meta-analysis
- Sports and Vitamin D category
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.
Vitamin D2 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.
Copyright (C) 2016 by the National Strength & Conditioning Association.
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