Intersystem integration and chemoresponsiveness of cardiorespiratory system in athletes according to their sports qualification

It is very important to understanding adaptive changes in the mechanisms of gas exchange regulation and oxygen supply of the organism, depending on sports mastery, to manage the training activity. The purpose of the paper is to study the peculiarities of adaptive reactions in cyclic sports athletes of different fitness levels in response to hypoxic and hypercapnic load. Materials and Methods. Swimmers and track-athletes (only men), aged 18-23), high and medium levels of sports qualification, were examined. The cardiorespiratory parameters were registered by the ergospirometric system OxyconPro @ (Erich Jaeger). Swimmers were subjected to: a) gradually increasing (from 20.9 to 10 % O2) 25-minute hypoxia; b) smoothly increasing 25-minute hypercapnia (breathing into a confined space). Track-athletes experienced 10-minute acute (10 % O2) hypoxia. Results. It is typical that highly qualified swimmers demonstrate the reduction of heart response to hypoxia and less sensitivity to changes in the partial oxygen pressure in the alveolar gas...