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Diurnal variation in red blood cell variables in athletes after single and repeated bouts of exercise
Title Diurnal variation in red blood cell variables in athletes after single and repeated bouts of exercise Author info Roman Alebrty ... [et al.] Author Alberty Roman 1956- (50%) UMBFP09 - Katedra biológie a ekológie
Co-authors Pupiš Martin 1978- (30%) UMBFF09 - Katedra telesnej výchovy a športu
Vachalík Vladimír (10%)
Bátovský Miloš (10%)
Source document The Journal of Sports Medicine and Physical Fitness. Vol. 61, no. 2 (2021), pp. 269-279. - Torino : Edizioni Minerva Medica, 2021 Keywords športovci - sportsmen krvinky - blood cells Form. Descr. články - journal articles Language English Country Italy Annotation BACKGROUND: The aim of this study was to examine the diurnal and exercise-related changes in red blood cell variables which serve as indirect markers of doping in sports. METHODS: Ten men and 7 women, all undoped highly trained endurance athletes aged 19-34 years, were included in the study. Before and on the day with single and repeated bouts of exercise, blood samples were collected at 07:00, 09:00, 13:00, 18:00, and 21:00, at least 2 hours after exercise. Hemoglobin (Hb), hematocrit (Hct), and the reticulocytes % (Ret%) were determined by flow cytometry. Changes in OFF-hr score were also calculated and repeated-measures ANOVA was used to compare diurnal differences. RESULTS: In overall, the mean Hb decreased continuously by 4.5 and 3.3% (all P<0.001) over the day with single and repeated bouts of exercise, respectively. Corresponding values for the decline in Hct were 4.2 and 5.9% (all P<0.001). In contrast, the Ret% showed no apparent diurnal rhythm but single and repeated bouts of exercise increased the relative Ret% in the evening by 12.4 and 16.7% (P<0.01), respectively. Then the calculated OFF-hr score was reduced by 6.2 and 9.8% (all P<0.01) at the end of the day. CONCLUSIONS: These results confirmed the normal diurnal pattern in the examined red blood cell variables in response to exercise in highly trained athletes. Furthermore, they showed noticeable between-subject variability and the possible risk of a false suspicion of blood doping in undoped athletes after repeated bouts of exercise. URL Link na plný text Link do databázy WoS Public work category ADC No. of Archival Copy 49640 Catal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Database xpca - PUBLIKAČNÁ ČINNOSŤ References PERIODIKÁ-Súborný záznam periodika 
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