16 research outputs found
Use of the Wilson equation for the prediction of the sorptional equilibrium of sugar-based foodstuffs
Strength adaptations and hormonal responses to resistance training and detraining in preadolescent males
Ninteen untrained preadolescent males (11-13 years old) were randomly
placed into an experimental trained group (STG, n = 9) and a control
group (n = 10). Informed consent was obtained from the children and
their parents. The STG was submitted to a 2-month resistance-training
program (6 exercises, 3 X 10 repetitions maximum [RM], 3 times per
week), followed by a 2-month detraining program. The effectiveness of
the resistance program was determined by measuring pre- and posttraining
and detraining differences in isometric and isotonic (10RM) strength and
hormonal responses in testosterone (T), sex hormone binding globulin,
and free androgen index (FAI). Their maturation stage was evaluated
according to Tanner. Significant posttraining isometric strength gains
(17.5%) and mean T and FAI value increases (P < 0.05-0.001) were
observed in STG. Detraining resulted in a significant loss (9.5%, p <
0.001) of isometric strength whereas the hormonal parameters of STG
remained practically unaltered. The relative (Delta%) postdetraining
hormonal responses correlated significantly with the respective
isometric strength changes. In conclusion, the resistance training
induced strength changes independent of the changes in the anabolic and
androgenic activity in preadolescent males. Further research is needed
to fully clarify the physiological mechanisms underlying the strength
training and detraining process