| Summary: | Concerns have been raised regarding the effects
of short time intensive training on adolescent athletes. The aim of the present
study was to investigate six weeks of volleyball training on hormonal and
biochemical profile in elite high school male volleyball players in
Golestan province (Iran) in preparation season to take part in global
competitions of champion school in France. Subjects of training group consisted
of 12 elite volleyball players in premier league students and the control group
consisted of 12 healthy and non-athlete boy students. The training group
practiced at 60-85% maximum heart rate
(MHR) for 6 weeks, 90 minutes per session, 6 sessions per week and 3 sessions a
day (first session: technical practice, second session: tactical practices and
third session: technical/tactical practices). Blood samples were taken
following 12 hours of fasting both before and after the volleyball training.
cortisol and lactate dehydrogenase concentrations significantly decreased in
the training group following 6 weeks of Preparation training. With the
exception of cortisol there was no significant difference between the groups
regarding lactate dehydrogenase variable. Glucose
concentration significantly increased in the training group following the 6
weeks Preparation training, also significant difference was observed between
the control and training group. Testosterone, insulin and insulin resistance
levels were increased and cortisol/testosterone ratio was decreased in the
training subjects following the 6 weeks of Preparation training (P>0.05).
However, the results revealed no significant difference between the two groups
regarding these variables. Our results show that
volleyball training during the 6 weeks in the preparation season can lead to
abnormalities in indices of glucose homeostasis. Also the results suggest that
along with the improvement of anaerobic and aerobic characteristics, training
reduces the catabolic and inflammatory response to exercise.
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