Functional state of breathing system in 12-year-old teens
In order to study physical development, reserve and adaptive abilities in 12-year old teens, schoolchildren of the main health group were studied. The following methods were used to study the external respiration: spyrography, phase analysis of the respiratory cycle, breathing flow volume loop analysis. At teen age breathing system is characterized by instability and indices variability. Big hormonal changes during puberty still require a lot of energy resources, which in turn maintain a rather high level of lungs hyperventilation. Functional state indices of respiratory tracts and lung tissue change accordingly to the variability of anthropometric characteristics of the organism. Children with a high weightheight Kettle’s index have normal, age appropriate lung volume. Children with low index fall a little behind their physically developed peers in airway patency. As children grow, vegetative balance becomes stable, i.e. the role of parasympathetic nervous system becomes bigger.