Method and apparatus for determining an indicator which is dependent on respiratory data

A method for determining an indicator which is dependent on respiratory data and defines a transition from an aerobic to an anaerobic metabolism of a person, with said person being subjected to a physical stress, wherein discrete O2 and CO2 concentration values are measured directly in said person's respiratory gas stream at predetermined times in the course of at least one respiration period, and wherein said indicator defining said aerobic-to-anaerobic transition is derived from said discrete O2 and CO2 concentration values by using a mathematical model.

An apparatus for determining an indicator which depends on respiratory data from a person's respiratory gas stream and defines a transition from an aerobic to an anaerobic metabolism of a person, with said person being subjected to a physical stress, having a processor unit to process said respiratory data and an output unit, wherein sensors are provided for the measurement of the O2 and CO2 concentration, which sensors are positioned directly in the respiratory gas stream and are suitable to detect the time course of said O2 and CO2 concentration values or discrete concentration values within at least one respiration period.

A method for determining an indicator which is dependent on respiratory data and defines a transition from an aerobic to an anerobic metabolism of a person, with said person being subjected to a physical stress, wherein O2 and CO2 concentrations are measured directly in said person's respiratory gas stream, with the time course of said O2 and CO2 concentration values being acquired within at least one respiration period, and wherein said indicator defining said aerobic-to-anaerobic transition is derived from shape criteria of the expiratory part of said time course of said O2 and CO2 concentration values using a mathematical model.

An apparatus for determining an indicator which depends on respiratory data from a person's respiratory gas stream and defines a transition from an aerobic to an anaerobic metabolism of a person, with said person being subjected to a physical stress, having a processor unit to process said respiratory data and an output unit, wherein sensors are provided for the measurement of the O2 and CO2 concentration, which sensors are positioned directly in the respiratory gas stream and are suitable to detect the time course of said O2 and CO2 concentration values or discrete O2 and CO2 concentration values within at least one respiration period, said processor unit providing an indicator derived from shape criteria of the expiratory part of said time course of said O2 and CO2 concentration values using a mathematical model.