Tag: Bone

, by Guru Performance

Episode 113 of the Guru Performance ‘We Do Science’ podcast! In this episode, I (Laurent Bannock) discuss “DXA and Body Composition Assessment: Gold Standard or Gold Plated?” with Dr Julia Bone PhD (Sport Institute Northern Ireland, UK).

In this session we get into:

  • DXA defined in the context of its design and use as an imaging system
  • Body composition reference methods
  • DXA use in research and practice in sport and exercise science and nutrition
  • Standardisation and measurement errors in body composition assessment using DXA
  • Effects of exercise, nutrition and hydration, menstrual cycle etc on DXA measurements of body composition
  • Best practice protocols for optimise “accuracy and reliability” of DXA assessments for use in research and practice

Key Papers / Resources:


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, by Guru Performance

Download the Full PDF article >> Guru Performance Position Stand #4 Vitamin D for health and performance


  1. Introduction
  2. What is vitamin D and why is it a unique vitamin?
  3. What does vitamin D do?
  4. Why is there such a fuss about vitamin D
  5. Is there any relevance for all of this in athletes?
  6. How can we manage the vitamin D status of athletes?
  7. Context statement
  8. References
  9. Authors




Click on infographic to enlarge


Vitamin D is amongst the most ‘on trend’ sports supplements used by recreational and elite athletes. This gives the impression that vitamin D is an ergogenic aid when in fact it is a biological necessity. The idea of vitamin D as an ergogenic aid is, unfortunately, one of many false notions that surround this essential nutrient, and so in this position stand we dispel some common myths and tackle the question of whether vitamin D is important for athlete health and athletic performance. We provide enough detail to allow a proper understanding of what vitamin D is, how we can determine whether someone has enough vitamin D, and whether being vitamin D deficient has any adverse effects on athletic performance. We round off our position stand by providing evidence based suggestions for managing vitamin D concentrations throughout the year and making you aware of the problems that this fascinating area of research still faces.


Download the Full PDF article >> Guru Performance Position Stand #4 Vitamin D for health and performance