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THE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS
Rivista di Medicina, Traumatologia e Psicologia dello Sport
Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
Original articles EXERCISE PHYSIOLOGY AND BIOMECHANICS
The Journal of Sports Medicine and Physical Fitness 2004 September;44(3):219-23
Development of aerobic power in pubescent male soccer players related to hematocrit, hemoglobin and maturation. A longitudinal study
Hansen L. 1, Klausen K. 2
1 Institute of Medical Anatomy University of Copenhagen, Copenhagen, Denmark
2 Institute of Sports Science University of Copenhagen, Copenhagen, Denmark
Aim. More than ever young athletes are training intensively and compete at high levels. As adolescent athletes are training in a period associated with many changes in growth and maturation longitudinal studies are important to elucidate the development in physical parameters. The aim of this study was to evaluate the development in aerobic power in elite as well as non-elite soccer players during the years of puberty and to relate it to maturation as well as hemoglobin and hematocrit.
Methods. Forty-nine young male soccer players at elite and non-elite levels (10.5-13 y) were recruited as subjects. All subjects were tested 4 times over a period of 3.5 years. Anthropometrical parameters including skinfold were measured. V.O2max was assessed during treadmill run, testicular volume and testosterone levels were used to estimate maturation, and hemoglobin (Hb) as well as hematocrit (Htc) was measured from blood samples.
Results. A longitudinal development in V.O2max (l/min) was found for all players together. The elite players have higher values and steeper increase compared to non elite-players. This difference was still present when V.O2max was adjusted for body weight (ml/kg/min).
Conclusion. The general development in V.O2max was significantly correlated to the development in Hb and Htc as well as maturation, but the difference between elite and non-elite players could not be explained from differences in these variables. As elite players often are selected at a very young age it is possible that training effect is present but it cannot be excluded that genetic factors may play an important role.