Abstract

The purpose of the following investigation was to monitor the basic level of serum free testosterone (Tl) and total (Tt), cortisole (C) and leg explosive power during five months in fifteen professional soccer players. All the subjects were tested in three different period: July (test 1), September (test 2) and December (test 3). In the last evaluation, the leg extensor power was also measured during a vertical jump test. Both hormonal profile and explosive power capacity expressed as arbitrary units were correlated with the subjective assessment expressed by journalist on the technical and physical capacity expressed by the players during twelve official matches. The serum level of C remain unchanged in September while in December increased by 20% (p<0.01). The value of Tt increased in September (38%), (p<0.01) and in December (12%) (p<0.05). Similar trend was observed for basic serum concentration of Tl. The ratio Tt /C or Tl/C demonstrated an enhancement in September compared to July (<0.05), while in December no changes were noted. The results obtained were discussed in function of the catabolic and anabolic properties, which are characterising C and T. However, the influence of these hormones on socio-environmental behaviour and on physiological characteristics (e.g. speed, power, and fatigue) were particularly discussed. In conclusion, the present results demonstrated peculiar and interesting observations since the subjective assessment, expressed by the journalists, related to technical and physical conditions showed by the players during twelve official matches was positively correlated with the biological profile measured in the soccer. It is suggested that even if the same workloads could be administrated to several subjects, the biological adaptation to the training stimulus could be rather different among the subjects. In fact socio-environmental conditions could play an important role on determining a positive training effect. Verf.-Referat