Models of some physiological parameters based on spiroergometric exercise test

Exercise testing systems with appropriate gas exchange measurements offer important data for sport training, medical diagnosis, rehabilitation and evaluation of cardio respiratory kinetics. Measuring of basic physiological parameters during exercise test is an important task in order to establish the working capacity or physical condition of the patient and also enable derive models of important physiological parameters. Exercise testing offers the investigator the possibility to study simultaneously cellular, cardiovascular and respiratory systems and their response during accurately controlled workload. Heart rate, pulmonary ventilation, breathing frequency and blood pressure are automatically measured during the examination. Also oxygen and carbon dioxide content in expired air are measured and intensity of the workload is set by computer. From these data other standard parameters like oxygen uptake, CO2 expenditure etc. during the whole test could be calculated by means of personal computer. In this paper, nonlinear modelling approach is used for Hammerstein system which is applied to estimate cardiovascular system response to exercise. These models can be used in situations, where only limited parameters can be registered e.g. during out door workload testing.