Every single Taekwondo (indoor) Korean teen had low Vitamin D

Created September 2019

The Associations of Vitamin D Status with Athletic Performance and Blood-borne Markers in Adolescent Athletes: A Cross-Sectional Study

IJERPH Volume 16 Issue 18 10.3390/ijerph16183422

Myong-Won Seo1, Jong Kook Song 1,Hyun Chul Jung 2,Sung-Woo Kim 1,Jung-Hyun Kim 3 andJung-Min Lee 4,

1. This study group had 3 reasons to have low vitamin D1. People who are Indoors a lot (little sunlight) have lower vitamin D 1. Darker-skinned people have lower vitamin D 1. People living far from the equator have lower vitamin D 1. Overview Sports and vitamin D has the following summary{include} 1. Sports category starts with{include}Note: The Taekwondo athletes all had < 30 ngIndoor athletes benefit from adding VItamin D* Taekwondo athletes helped by just 1 month of Vitamin D (longer would be better) - RCT May 2018* Muscle strength of Judo athletes increased 13 percent following single dose of 150,000 IU vitamin D – RCT Nov 2015* Fewer injuries and higher ballet jumps with 2,000 IU of vitamin D – April 2013* Collegiate Swimmers getting 4000 IU of vitamin D had fewer injuries – March 2013* Teen dancers had 3X fewer traumatic injuries after 120,000 IU Vitamin D over a week – RCT June 2018

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The purpose of this study was to examine the associations of vitamin D status with athletic performance and blood-borne markers in adolescent athletes. This cross-sectional study included forty-seven Taekwondo athletes, aged 15–18 years old. Athletic performance was assessed using maximal oxygen consumption (VO2max), Wingate anaerobic power test, vertical jump, agility T-test, lower limb muscle strength, and fatigue resistance. Blood samples were collected to assess serum 25-hydroxyvitamin D [25(OH)D], free-testosterone, cortisol, creatine kinase, and urea. One-way ANOVAs were applied using Bonferroni adjusted alpha levels, which was 0.02 (i.e., 0.05/3).

Multiple linear regressions analyses as well as Pearson and partial correlation analyses were used to examine the relationship among 25(OH)D concentration, athletic performance, and blood-borne markers. The participants 25(OH)D concentration were ranged from 16 to 73.25 nmol/L, indicating that 74.5% of the adolescent athletes have vitamin D insufficiency or deficiency.

The vitamin D status did not show any significant effects on the performance factors or blood-borne markers. Serum 25(OH)D concentration was positively correlated with mean power output (r = 0.359, p < 0.05) and relative mean power output (r = 0.325, p < 0.05) after adjusting for bone age, height, weight, training experience, lean body mass, and fat mass. However, 25(OH)D concentration was not associated with other performance-related factors and blood-borne markers. In addition, multiple linear regressions analyses revealed that serum 25(OH)D concentration were not significant predictors of athletic performance in adolescent athletes.

In conclusion, vitamin D status is weakly correlated with anaerobic capacity; moreover, the underlying mechanisms of how vitamin D influence anaerobic performance is unclear in the present study. Nevertheless, the importance of vitamin D on health benefits should not be underestimated, especially during growth periods.

Tags: Darker Skin Orient Sports