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Objective : The purpose of this study was to investigate muscle strength and skeletal age in trained and untrained pubertal boys and its relationship to the levels of Testosterone (T), Growth Hormone (GH) and Procollagen (PICP). Methods : Both the exercise and control groups consisted of 24 (mean 12.91, sd = 0.63) and 17 (mean 12.91, sd = 0.48) year old boys, respectively. The exercise group (EG), in addition to school activities, participated in a rowing training program for six months (rowing technique, strength & aerobic exercises, 60 min/day, three days/week). The control group (CG) only participated in the school physical education program, two to three times/week. Hormonal concentrations were measured by radioimmunoassay techniques. Venus blood samples were taken at rest from both groups. Results : Testosterone was increased in both groups (p<0.001). Significant differences were found within groups in T before training (p<0.01) There was an increase of PICP in EG after training (p<0.01). Differences on GH were observed before the training period in both groups (p<0.01). Both groups significantly differed in upper and lower limbs strengths. Significant correlation was found between PICP and skeletal age in both (p<0.05 and p<0.02, respectively) Conclusions: The gains in muscle strength in both groups may partly be explained by the increase in the concentrations of hormone levels and the changes in body size. Key words : skeletal age, muscle strength, anabolic hormones, rowing

The Influence of Physical Training on Blood Levels of Human Growth Hormone, Testosterone and Procollagen in Young Rowers