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Taekwondo athletes helped by just 1 month of Vitamin D (longer would be better) - RCT May 2018

2 publications of the extremely short trial are on this page

Correcting Vitamin D Insufficiency Improves Some, But Not All Aspects of Physical Performance during Winter Training in Taekwondo Athletes.

Int J Sport Nutr Exerc Metab. 2018 May 3:1-25. doi: 10.1123/ijsnem.2017-0412. [Epub ahead of print]

  • This is one of a very few trials to find any improvement in just 1 month
  • It takes up to 2-6 months to raise the vitamin D levels, then another few months for the body to benefit from the improved levels
  • 5,000 IU daily: Vitamin D levels 12 ng ==> 38 ng
  • Note – Llow vitamin D levels are typical of indoor sports
  • Note - Vitamin D especially increases fast-twitch muscles (used by Taekwondo)
  • Note - Might have had a similar improvement with a loading dose of 150,000 IU ( 5,000 IU * 30 days)


See also VitaminDWiki

Overview Sports and vitamin D has the following summary

Athletes are helped by vitamin D by:

  1. Faster reaction time
  2. Far fewer colds/flus during the winter
  3. Less sore/tired after a workout
  4. Fewer micro-cracks and broken bones
  5. Bones which do break heal much more quickly
  6. Increased VO2 and exercise endurance Feb 2011
  7. Indoor athletes especially need vitamin D
  8. Professional indoor athletes are starting to take vitamin D and/or use UV beds
  9. Olympic athletes have used UV/vitamin D since the 1930's
  10. The biggest gain from the use of vitamin D is by those who exercise less than 2 hours per day.
  11. Reduced muscle fatigue with 10,000 IU vitamin D daily
  12. Muscle strength improved when vitamin D added: 3 Meta-analysis
  13. Reduced Concussions
    See also: Sports and Vitamin D category 272 items

PDF is available free at Sci-Hub   10.1123/ijsnem.2017-0412.

Jung HC1, Seo MW2, Lee S3, Jung SW2, Song JK2.
1 Department of Kinesiology, College of Health and Pharmaceutical Sciences, University of Louisiana at Monroe, Monroe, LA.
2 Department of Taekwondo, College of Physical Education, Global Campus, Kyung Hee University, Gyeonggi-do 17014, South Korea.
3 Department of Counseling, Health, and Kinesiology, College of Education and Human Development, Texas A&M University-San Antonio, San Antonio, TX.

We investigated the effects of vitamin D3 supplementation on physical performance during winter training in vitamin D insufficient taekwondo (TKD) athletes. Thirty-five collegiate male and female TKD athletes, aged 19-22 years with low serum 25(OH)D concentration (28.8±1.10 nmol/L) were randomly assigned to a vitamin D group (N=20) or a placebo group (N=15). Subjects received either a vitamin D3 capsule (5,000 IU/day) or placebo during four weeks of winter training. Blood samples were collected for analyzing serum 25(OH)D concentration. Physical performance tests included Wingate anaerobic test, isokinetic muscle strength and endurance, a counter movement jump (CMJ) test, sit-ups, agility test, and 20 m pacer. Serum 25(OH)D concentrations increased significantly in the vitamin D group (96.0±3.77 nmol/L) after four weeks of supplementation, but no changes were found in the placebo group (F=242.44, p=.000).
There were significant interaction effects for

  • anaerobic peak power (F=7.49, p=.010) and
  • isokinetic knee extension at 180°/sec (F=6.08, p=.019).

Changes in serum 25(OH)D concentration were positively associated with changes in peak power, and isokinetic knee extension at 180°/sec. However, no significant interaction effects were observed in other performance variables. This study suggests that four weeks of vitamin D supplementation elevates serum 25(OH)D concentration to sufficient levels. Correcting vitamin D insufficiency improves some, but not all aspects of performance. Thus, efficacy of vitamin D supplementation to enhance performance remains unclear.

Vitamin D₃ Supplementation Reduces the Symptoms of Upper Respiratory Tract Infection during Winter Training in Vitamin D-Insufficient Taekwondo Athletes: A Randomized Controlled Trial - Sept 2018

Still not much results since the trial lasted only 1 month and they monitored the respiratory track problems from the first day, even though it would take 2-4 months to restore the levels of vitamin D
 Download the PDF from VitaminDWiki

Created by admin. Last Modification: Saturday September 14, 2019 15:51:19 GMT-0000 by admin. (Version 10)

Attached files

ID Name Comment Uploaded Size Downloads
11287 Taekwondo Athletes URTI.pdf admin 29 Jan, 2019 1.35 Mb 628
10849 Taekwondo.jpg admin 16 Nov, 2018 82.64 Kb 1203