Experiments on smooth muscles of rat stomach showed that lysophosphatidylcholine in concentrations of 10(-8) and 10(-7) g/ml does not modulate the tonotropic effect of acetylcholine (10(-6) g/ml), in a concentration of 10(-6) g/ml potentiated this effect (similarly to phosphatidylcholine, 10(-6) g/ml), and reduced it in concentrations of 10(-5)-10(-4) g/ml (similarly to hen egg yolk in dilutions of 1:500, 1:100, and 1:500). These data indicate that lysophosphatidylcholine modifies signal transduction from the receptor to G protein.

Purpose:The purpose of the research is to study influence of regular trainings in rhythmic gymnastics and sports acrobatics on physical and sexual development of girls. Material:10-year-old girls (n=102) participated in research. One part of them was engaged in rhythmic gymnastics (n=36), other part was engaged in acrobatics (n=15). Sexual development was evaluated on secondary sexual characteristics. Physical development was evaluated according 31 absolute and 28 relative anthropometrical parameters. Results:Physical development of gymnasts and acrobats does not meet age standard. Gymnasts and acrobats are retarded of equal in age girls according 32 of 59 parameters. It shows that there is a presence of more asthenic somatotype. Gymnasts have more decreased parameters of physical development, than in acrobats. It is explained by early start of trainings (on 1,21 year) and more strict selection. Development of secondary sexual characteristics in gymnasts and acrobats are within age norm. Conclusions:rhythmic gymnastics and acrobatics cause delay of physical and sexual development in girls. It is not favorable for reproductive health.

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