Blood profiles in elite cross-country skiers: a 6-year follow-up.
Following the doping scandals at the World Championships in cross-country skiing in 2001, the International Ski Federation decided to generate individual blood profiles. From 2001 to 2007, 7081 blood samples from 1074 male and female elite cross-country skiers were collected and analyzed for hemoglobin concentration [Hb] and % reticulocytes (%rets). Data were applied to blood algorithms wherefrom blood model scores were calculated. From 1997-1999 to 2001-2002, the mean [Hb] was reduced by 0.9 g/dL to 15.3 g/dL in male skiers and by 0.4 g/dL to 13.8 in female skiers. From 2002-2003 to 2006-2007, the combination of increases in [Hb] and decreases in %rets led to pronounced increases in mean OFF-model scores. [Hb] was 0.2 g/dL higher at Olympic Games/World Championships (WOCs) than at World Cups competitions <4 weeks before and after WOCs. [Hb] and %rets increased with altitude in both genders. Since the introduction of an enlarged blood testing program, the mean [Hb] values were lowered to close to normal levels, but over the last 2-3 years there has been a small elevation and an increase in OFF-model scores, which may indicate a change in the manipulations used to elevate the [Hb].
Morkeberg
J
J
Department of Anaesthesiology, Bispebjerg Hospital, Bispebjerg Bakke, Copenhagen NV, Denmark. jakobmoerkeberg@hotmail.com
Saltin
B
B
Belhage
B
B
Damsgaard
R
R
D054874:Athletic Performance / Q000502:physiology*; D004300:Doping in Sports / Q000517:prevention & control; D005260:Female; D005500:Follow-Up Studies; D006454:Hemoglobins / Q000032:analysis*; D006801:Humans; D008297:Male; D010807:Physical Endurance / Q000502:physiology; D017701:Reticulocyte Count; D012865:Skiing / Q000502:physiology*
D006454:Hemoglobins