Boyadjiev N, Taralov Z
Department of Physiology, Faculty of Medicine, Higher Medical Institute, Plovdiv, Bulgaria.
Br J Sports Med. 2000 Jun;34(3):200-4. doi: 10.1136/bjsm.34.3.200.
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.
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.
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.
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 10(12)/l v 4.75 (0.02) x 10(12)/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 10(12)/l, 0.386 (0.006) l/l, and 129.38 (1.80) g/l respectively) and the rowing subgroup (4.66 (0.03) x 10(12)/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 10(12)/l, 0.314 (0.003) l/l, and 124.27 (0.93) g/l) and the swimming subgroup (4.40 (0.05) x 10(12)/l, 0.375 (0.005) l/l, and 125.90 (1.30) g/l). No differences were found in the mean corpuscular volume.
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.
从事高强度体育活动的运动员常出现血液学状态欠佳的情况。甚至有报道称高强度体育锻炼会引发“运动性贫血”。然而，关于长期进行不同类型运动对青春期运动员红细胞变量影响的研究却非常少。
评估来自不同运动项目的高水平训练青春期运动员的基本红细胞变量，并将结果与未训练的对照组进行比较。同时也评估这些变量中的性别差异。
本研究纳入了876名高水平训练的运动员（559名男孩和317名女孩）。他们的平均（标准误）年龄、体重和训练时长分别为：14.01（0.06）岁、56.24（0.52）千克和3.52（0.07）年。对照组由357名未训练的受试者（171名男孩和186名女孩）组成，平均（标准误）年龄和体重分别为14.58（0.09）岁和57.75（0.67）千克。运动员组根据所从事的运动项目分为七个亚组：田径（105人）、游泳（107人）、赛艇（230人）
