[Changes of body mass components and body constitution in boys 7-17 years of age].
The longitudinal studies of boys aged 7-17 years were performed to trace the dynamics of growth processes, indices of endomorphism, mesomorphism and ectomorphism according to type of body build. The indices of somatotype stability, proposed by the authors, depending on the age and body build, are discussed. It is shown that the least variable are the boys of asthenoid and digestive types of body build, while those belonging to muscular and thoraco-muscular types undergo changes most frequently. At the age of 9-10 years the somatotype variability is the greatest. By the age of 15-17 years the proportion of the boys belonging to asthenoid-thoracal type is increased, that is characterized by a deceleration of skeletal muscles development and an increase in the ectomorphism index.
Kornienko
I A
IA
Laboratory of Physiology of Muscular Activity, Russian Academy of Education, Institute of Age Physiology, Moscow.
Tambovtseva
R V
RV
Panasiuk
T V
TV
D000293:Adolescent; D000375:Aging / Q000502:physiology*; D001823:Body Composition / Q000502:physiology*; D001824:Body Constitution / Q000502:physiology*; D002648:Child; D006128:Growth; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D013008:Somatotypes / Q000502:physiology*