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. 2000 Jun;34(3):200–204. doi: 10.1136/bjsm.34.3.200

Red blood cell variables in highly trained pubescent athletes: a comparative analysis

N Boyadjiev 1, Z Taralov 1
PMCID: PMC1763253  PMID: 10854020

Abstract

Background—A suboptimal haematological status has often been recorded in athletes involved in intensive physical activity. There have even been reports of "sports anaemia" associated with intensive physical exercise. However, studies on the effect of different types of exercise practiced over a long period of time on the red blood cell variables in pubescent athletes are very few.

Aim—To assess the basic red blood cell variables in highly trained pubescent athletes from different sports and to compare the results with those for a control untrained group. Sex related differences in these variables were also assessed.

Methods—876 highly trained athletes (559 boys and 317 girls) were included in the study. Their mean (SEM) age, weight, and duration of training were: 14.01 (0.06) years, 56.24 (0.52) kg, and 3.52 (0.07) years respectively. The control group consisted of 357 untrained subjects (171 boys and 186 girls) with mean (SEM) age and weight of 14.58 (0.09) years and 57.75 (0.67) kg. The group of athletes was divided into seven subgroups according to the sport practiced: athletics (105), swimming (107), rowing (230), wrestling (225), weight lifting (47), various team sports (92), and other sports (67). Venous blood samples were drawn from the cubital vein, and the red blood cell count, packed cell volume, haemoglobin concentration, and mean corpuscular volume were measured. Statistical indices were computed for each group and for each variable, and analysis of variance factorial analysis was performed to evaluate the statistical significance of the differences detected.

Results—The highly trained group was found to have lower red blood cell count, packed cell volume, and haemoglobin concentration (p<0.001) than the control untrained group (4.61 (0.01) x 1012/1 v 4.75 (0.02) x 1012/l, 0.389 (0.001) v 0.404 (0.002) l/l, and 133.01 (0.38) v 139.9 (0.62) g/l respectively). These variables were lower for the boys of the trained group than for the boys of the control group (p<0.001), and similarly for the girls (p<0.001). The lowest red blood cell count, packed cell volume, and haemoglobin concentration were measured in blood samples from the boys of the swimming subgroup (4.54 (0.06) x 1012/l, 0.386 (0.006) l/l, and 129.38 (1.80) g/1 respectively) and the rowing subgroup (4.66 (0.03) x 1012/l, 0.400 (0.003) l/l, and 136.21 (0.94) respectively). The same distribution was found for the girls: lowest in the rowing subgroup (4.32 (0.04) x 1012/1, 0.314 (0.003) l/l, and 124.27 (0.93) g/1) and the swimming subgroup (4.40 (0.05) x 1012/l, 0.375 (0.005) l/l, and 125.90 (1.30) g/1). No differences were found in the mean corpuscular volume.

Conclusions—Continuous (more than one year) high intensity sports training (twice a day/five days a week) results in a decrease in the basic red blood cell variables in pubescent boys and girls, this being most pronounced in the submaximal sports.

Key Words: erythrocytes; haemoglobin; packed cell volume; mean corpuscular volume; pubescence; training

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Selected References

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  1. Biancotti P. P., Caropreso A., Di Vincenzo G. C., Ganzit G. P., Gribaudo C. G. Hematological status in a group of male athletes of different sports. J Sports Med Phys Fitness. 1992 Mar;32(1):70–75. [PubMed] [Google Scholar]
  2. Brodthagen U. A., Hansen K. N., Knudsen J. B., Jordal R., Kristensen O., Paulev P. E. Red cell 2,3-DPG, ATP, and mean cell volume in highly trained athletes. Effect of long-term submaximal exercise. Eur J Appl Physiol Occup Physiol. 1985;53(4):334–338. doi: 10.1007/BF00422849. [DOI] [PubMed] [Google Scholar]
  3. Cordova Martinez A., Escanero J. F. Iron, transferrin, and haptoglobin levels after a single bout of exercise in men. Physiol Behav. 1992 Apr;51(4):719–722. doi: 10.1016/0031-9384(92)90107-d. [DOI] [PubMed] [Google Scholar]
  4. Cordova A., Navas F. J., Escanero J. F. The effect of exercise and zinc supplement on the hematological parameters in rats. Biol Trace Elem Res. 1993 Oct;39(1):13–20. doi: 10.1007/BF02783805. [DOI] [PubMed] [Google Scholar]
  5. Gimenez M., Mohan-Kumar T., Humbert J. C., De Talance N., Buisine J. Leukocyte, lymphocyte and platelet response to dynamic exercise. Duration or intensity effect? Eur J Appl Physiol Occup Physiol. 1986;55(5):465–470. doi: 10.1007/BF00421638. [DOI] [PubMed] [Google Scholar]
  6. Hasibeder W., Schobersberger W., Mairbäurl H. Red cell oxygen transport before and after short-term maximal swimming in dependence on training status. Int J Sports Med. 1987 Apr;8(2):105–108. doi: 10.1055/s-2008-1025650. [DOI] [PubMed] [Google Scholar]
  7. Laub M., Hvid-Jacobsen K., Hovind P., Kanstrup I. L., Christensen N. J., Nielsen S. L. Spleen emptying and venous hematocrit in humans during exercise. J Appl Physiol (1985) 1993 Mar;74(3):1024–1026. doi: 10.1152/jappl.1993.74.3.1024. [DOI] [PubMed] [Google Scholar]
  8. Magazanik A., Weinstein Y., Dlin R. A., Derin M., Schwartzman S., Allalouf D. Iron deficiency caused by 7 weeks of intensive physical exercise. Eur J Appl Physiol Occup Physiol. 1988;57(2):198–202. doi: 10.1007/BF00640663. [DOI] [PubMed] [Google Scholar]
  9. Radomski M. W., Sabiston B. H., Isoard P. Development of "sports anemia" in physically fit men after daily sustained submaximal exercise. Aviat Space Environ Med. 1980 Jan;51(1):41–45. [PubMed] [Google Scholar]
  10. Schmidt W., Maassen N., Trost F., Böning D. Training induced effects on blood volume, erythrocyte turnover and haemoglobin oxygen binding properties. Eur J Appl Physiol Occup Physiol. 1988;57(4):490–498. doi: 10.1007/BF00417998. [DOI] [PubMed] [Google Scholar]
  11. Schobersberger W., Tschann M., Hasibeder W., Steidl M., Herold M., Nachbauer W., Koller A. Consequences of 6 weeks of strength training on red cell O2 transport and iron status. Eur J Appl Physiol Occup Physiol. 1990;60(3):163–168. doi: 10.1007/BF00839152. [DOI] [PubMed] [Google Scholar]
  12. Schwandt H. J., Heyduck B., Gunga H. C., Röcker L. Influence of prolonged physical exercise on the erythropoietin concentration in blood. Eur J Appl Physiol Occup Physiol. 1991;63(6):463–466. doi: 10.1007/BF00868079. [DOI] [PubMed] [Google Scholar]
  13. Shiga S., Koyanagi I., Kannagi R. [Clinical reference values for laboratory hematology tests calculated using the iterative truncation method with correction: Part 1. Reference values for erythrocyte count, hemoglobin quantity, hematocrit and other erythrocyte parameters including MCV, MCH, MCHC and RDW]. Rinsho Byori. 1990 Jan;38(1):93–103. [PubMed] [Google Scholar]
  14. Szyguła Z., Spodaryk K., Dabrowski Z., Miszta H. Post-exercise anaemia as a result of exercise overloading of the organism. Physiol Bohemoslov. 1986;35(2):104–111. [PubMed] [Google Scholar]

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