Article Text

PDF
The influence of an 8 hour flight on haematological variables used in the athletes' biological passport of WADA
  1. S C Voss,
  2. M Alsayrafi,
  3. N Alsowaidi,
  4. M Elzain Elgingo,
  5. P Bourdon,
  6. N Robinson,
  7. P E Sottas,
  8. F Klodt,
  9. D Nonis,
  10. Y O Schumacher
  1. Aspire Academy, Sport Science Department, Doha, Qatar

Abstract

WADA's biological passport uses Hb and Ret% as markers for detection of blood doping. Athletes often have to travel long distances when they go for competition or training camps. Thus it is a legitimate discussion if the influence of travelling has a significant impact on these markers. For that reason the aim of this study was to investigate Hb and Ret% before and after a day of travelling including a flight of 8 h. 15 male endurance athletes performed a 14 h journey including an 8 h flight. Hydration status, bodyweight and fluid intake was controlled. Blood was sampled in the morning and evening of day 1 and day 2 for interday comparisons and to control if intraday fluctuations are a result of travelling or circadian rhythm. Day 1 The subject`s bodyweight did not show a significant difference between the two timepoints of day 11, with 72.9±5.9 kg in the morning and 72.5±5.8 kg in the evening. The subjects showed a positive fluid balance of 982±780 ml. Hb showed a significant decrease from 14.5±0.6 g/dl to 14.0±0.6 g/dl while Ret% remained unchanged (1.09±0.25% vs 1.03±0.29%). Day 2 The bodyweight of the subjects was 71.9±5.8 kg in the morning and 72.9±5.7 kg in the evening. The fluid balance was 407±908 ml. The high SD is a sign that some of the subjects had a negative fluid balance, which was the case for four subjects. Hb showed a significant decrease from 14.9±0.6 g/dl to 14.2±0.5 g/dl while Ret% remained unchanged (1.03±0.30% vs 1.06±0.32%). The homeostasis of the human body regarding its fluid balance and hydration remains stable during changing environmental conditions which occur at a typical travel day including an 8 h flight. We conclude that an 8 h flight does not change the haematological variables used in the biological passport in a bigger range than by circadian fluctuations. Thus blood samples after flights up to 8 h can be used for the interpretation in antidoping.

Statistics from Altmetric.com

Request permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.