[Age features of kidney response on food and physical loads in athletes--skiers].

The features of renal functions in older adolescents and young adults involved in ski racing, before and after water, food, and physical activity has been studied. Renal functions in the morning as baseline demonstrated an increase in GFR and greater maturity of osmoregulatory mechanisms (higher excretion of osmotically active substances, osmotic concentration index, the reabsorption of solute-free fluid) in adult compared with adolescents. After food intake in youths osmoregulatory mechanisms provided adequate renal response--increased excretion of ions in exchange for urea, that saved osmolality.

[Comparative analysis of gas exchange and cardiorespiratory systems reactions to increasing normobaric hypoxia and physical load of swimmers and skiers].

Qualification comparable groups of young men engaged in cyclic kinds of sports were tested with stepwise accruing loads on bicycle ergometer and 25-minute exponential increasing normobaric hypoxia to final concentration of 10% oxygen. Group of skiers, having the greatest values of the maximal oxygen consumption at muscular work, show the relaxed cardiorespiratory reactions and more falling of blood oxygen in the hypoxia. The swimmers, having restrictions of ventilatory function in the course of trainings, form preadaptation to hypoxia with changes of external respiration and gas exchange functions that allows at hypoxia to better oxygen sate the blood in lungs.