Diurnal and exercise-related variability of haemoglobin and reticulocytes in athletes.

Details

Serval ID
serval:BIB_E5D82FB0C0D6
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Diurnal and exercise-related variability of haemoglobin and reticulocytes in athletes.
Journal
International Journal of Sports Medicine
Author(s)
Schumacher Y.O., Wenning M., Robinson N., Sottas P.E., Ruecker G., Pottgiesser T.
ISSN
1439-3964[electronic], 0172-4622[linking]
Publication state
Published
Issued date
2010
Peer-reviewed
Oui
Volume
31
Number
4
Pages
225-230
Language
english
Abstract
Haemoglobin (Hb) and Reticulocytes (Ret) are measured as indirect markers of doping in athletes. We studied the diurnal variation, the impact of exercise, fluid intake and ambient temperature in athletes on these parameters. Hourly venous blood samples were obtained from 36 male athletes of different disciplines (endurance (END) and non-endurance (NON-END)) over 12 h during a typical training day. Seven inactive subjects served as controls (CON). Hb and Ret were determined. A mixed model procedure was used to analyse the data. At baseline, Hb was similar for all groups, END showed lower Ret than NON-END and CON. Exercise showed a significant impact on Hb (+0.46 g/dl, p<0.001), the effect disappeared approximately 2 h after exercise. Hb decreased over the day by approximately 0.55 g/dl (p<0.01). There was no relevant effect on Ret. Fluid intake and ambient temperature had no significant effect. Hb shows significant diurnal- and exercise related variations. In an anti-doping context, most of these variations are in favour of the athlete. Blood samples taken after exercise might therefore provide reliable results and thus be used for the longitudinal monitoring of athletes if a timeframe for the re-equilibration of vascular volumes is respected.
Keywords
Adult, Algorithms, Body Temperature Regulation, Case-Control Studies, Circadian Rhythm/physiology, Doping in Sports, Drinking, Exercise/physiology, Hemoglobins/analysis, Humans, Male, Motor Activity/physiology, Physical Endurance/physiology, Reticulocyte Count, Reticulocytes/cytology, Sports/physiology, Temperature, Time Factors
Pubmed
Web of science
Create date
11/03/2011 16:10
Last modification date
20/08/2019 16:09
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