Baseline values of cardiovascular and respiratory parameters predict response to acute hypoxia in young healthy men.

The majority of the available works have studied distinct hypoxic responses of respiratory and cardiovascular systems. This study examines how these systems interact while responding to hypoxia and whether baseline metrics moderate reactions to a hypoxic challenge. Central hemodynamic, aortic wave reflection, and gas exchange parameters were measured in 27 trained young men before and after 10-min normobaric isocapnic hypoxia (10 % O2).

[Individual-typological evaluation of cardiorespiratory responses to hypoxia and hypercapnia in young healthy men].

The aim of the study was the approaches development to a substantiation of recommendations on the persons selection for different types of physical exercise on the basis of individual chemoreflex reactivity of cardiorespiratory system. That's for the ventilatory and cardial responses in tests with increasing inhalation hypoxia and hypercapnia on the group of young healthy man was performed. It was shown that hypoxia induce predominantly cardial response, but hypercapnia--ventilatory response.

[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.

Temperature homeostatis and work efficiency in the cold.

The data concerning thermal homeostasis maintenance and energy cost of muscle work in a cold environment and at cold adaptation are presented. It was shown that 10 days' experimental acclimatizing to cold at daily two hour +13 degrees C sessions result in different individual adaptive forms, "euthermic" and "hypothermic", which have specific thermogenesis and body shell vascular reactions in a cold environment. Complex investigations were made on selected groups of people on the basis of professional work with the count of cold exposure time and level of muscular activity in cold.