Lecture 1 - Vit D/supplementation Flashcards
Describe 4 reasons why athletes right use supplements
- To correct deficiency - poor normal diet especially lacking in vitamins and minerals
- Convenience - The demands of the sport don’t allow optimal nutrition such as the tour de france
- Performance Enhancing
- ‘Keeping up with the Jones’ - taking the supplement because other competitors are
What is Gene Doping?
Cutting a gene from someone’s DNA to make a different protein to improve health
What condition could gene doping help with?
Cystic fibrosis
Name 4 dietary sources of Vit D
Oily fish
Milk
Orange juice
Yogurts
Explain the process of sunlight improving Vit D levels
Exposure to sunlight leads to exposure of precursors in the skin to sun, therefore forming to make vitamin D 3
What % of elite track and field athletes use supplements?
85%
What is the active form of Vit D?
Serum 25 (OH) D
What types of athletes are Vit D deficient? (Hallway et al, 2011)
Indoor athletes and northern hemisphere athletes
What is classed as Severely Deficient Vit D?
<12 nmol.-1
What is classed as Deficient Vit D?
12-30 nmol.-1
What is classed as inadequate Vit D?
30-50 nmol.-1
What is classed as adequate Vit D?
> 50 mol.-1
According to Close et al (2013) what % of British athletes are Vit D deficient?
35%
Explain 3 roles of vitamin D
Bone Health
- Increases calcium and phosphate absorption
- Bone mineral density increases with Vit D status
Muscle function
- Calcium kinetics
- Myoblast differentiation - muscle regeneration
- Muscle weakness evident with Vit D deficiency in male athletes
Immune function
- May support macrophage and monocyte function
- Evidence of URT infection rate with deficient Vit D status
Who might Vit D supplementation benefit? (Close et al, 2013)
Athletes with low baseline Vit D
