european college of sport science

Thursday, June 25th, 2009
In sequence by age-group, 11-12 and 13-14 years old, respectively, the following trends were noted: Chronological age (12.0, 14.2) height
(147.9, 166.9); weight (42.9, 59.8); arm spam (147.5, 171.5); BMI (19.43, 21.24); bicristal/biacromial ratio (72.8, 73.1); sitting height/height
ratio (51.0, 50.6) and adiposity (42.0, 33.4). In both somatotypes mesomorphism is the most representative category (3.4-4.7-2.9, 2.3-4.4-
3.3). However the 11-12 years-old group has a higher value for endomorphism and the 13-14 age-group a higher value for ectomorphism.
Looking at the mean values for the maturational indicators, the maturity offset (-2.02, 0.15) shows that the 13-14 years-old players
have already cross the peak height velocity, being this difference in the maturity process corroborated by the %PAH (84.9, 91.6).
Malina et al., 2004 found similar results for height and weight in young soccer players for different field positions (defense, midfield and
forward). This suggests that, at these ages, the morphological profile of young soccer goalkeeper is not different from that shown by
other players in different positions. However more studies regarding the characterization of young soccer goalkeepers using a more
extensive pool of variables are needed.
Carter JEL, Heath BH (1990). Somatotyping: Development and Applications. Cambridge University Press
Mirwald, R.L., Baxter-Jones, A.D.G., Bailey, D.A., & Beunen, G.P. (2002). An assessment of maturity from anthropometric measurements.
Medicine and Science in Sports and Exercise, 34 (4), 689-694.
Khamis, H.J., Roche, A.F. (1994). Predicting adult stature without using skeletal age: the Khamis-Roche method. Pediatrics, 94(4), 504-507.
Malina, R.M., Eisenmann, J.C., Cumming, S.P., Ribeiro, B., & Aroso, J. (2004). Maturity-associated variation in the growth and functional
capacities of youth football (soccer) players 13-15 years. European Journal of Applied Physiology, 91, 555-562.
HEMOGLOBIN AND HEMATOCRIT VALUES DUE TO TWO DIFFERENT MEASUREMENT SYSTEMS
ACHTZEHN, S., SPERLICH, B., DE MARÈES, M., MESTER, J.
GERMAN SPORT UNIVERSITY COLOGNE
Introduction: The measurement of hemoglobin (Hb) and hematocit (Hc) is of great interest to exercise science as well as in high performance
sport. Especially the effect of high altitude training is presented trough Hb and Hc measurement. High Hb concentrations measured
in athletes during competitions can have profound consequences to them. From this point, the measurement of hematological parameters
needs to be at high quality. But unfortunately it is not always possible to use the same devices to control these parameters or to
document time series. The aim of the study was to detect inter-device variability in the measurement of Hb and Hc.
Methods: For this, blood samples of 95 athletes where measured with two different devices: KX-21N, Sysmex (A), Germany and ABX
Micros 60 (B) from Horiba, France. The results were classified (device A as reference method) and absolute value differences were demonstrated.
Mean differences of Hb and Hc classes were statistically calculated.
Results: With device A the lowest Hb of 11.2 g/dl and highest of 17.0 g/dl was measured. The range from device B ranged from 10.8 g/dl
to 15.3 g/dl. The average of the value differences is 0.6 g/dl with a standard deviation of 0.6 g/dl. For example Hb (g/dl) of 15.6 (A) vs.
13.4 (B) an 17.0 (A) vs. 14.9 (B) were found. Although the correlation of the two devices is high (r=0.88) significant statistical differences in all
Hb-classes between the two devices were found (p=