Surgery – Diagnostic testing – Cardiovascular
Patent
1996-12-20
1998-07-21
Cohen, Lee S.
Surgery
Diagnostic testing
Cardiovascular
600528, 600529, 600483, 600484, 600531, 600513, A61B 508
Patent
active
057827729
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a device for dynamic recording of the respiratory, metabolic and/or ventilatory quantities during, a process or influence conducive to lactate production, having a data processing facility incorporating a display unit and also a computing unit, and having a device such as a mask connected via an analysis instrument to the data processing facility for determination of the respiratory minute volume and also of the O.sub.2 content and CO.sub.2 content of the respiratory minute volume of the inhaled or exhaled air.
The invention further relates to a method for reproducible assessment of the physical capacity of a living organism such as a human being during a process or influence conducive to lactate production by determination of the "individual anaerobic threshold".
STATE OF THE ART
The "individual anaerobic threshold" (Lactate Kinetics and Individual Anaerobic Threshold, Stegmann et al. International Journal of Sports Medicine, S. 160-165, Georg, Thieme Verlag Stuttgart, 1981) is a fixed and clearly reproducible value. This "individual anaerobic threshold" is also of importance for physiological parameters such as assessment of the physical capacity, blood pressure under load and coronary heart disease.
According to the prior art, the "individual anaerobic threshold" is obtained by determining the lactate, i.e. the lactic acid in the blood. The change in the proportion of lactic acid in the blood is determined as a function of the work performed per unit of time.
The drawback of this method is that blood samples, preferably from the earlobe, must be taken continually from the person whose individual anaerobic threshold is to be determined. These measures are not only laborious, but also permit determination of the "individual anaerobic threshold" only after a time-lag.
It is furthermore known from the prior art that breathing equivalent O.sub.2 ##EQU1## and the breathing equivalent CO.sub.2 ##EQU2## where the ventilation parameters are determined by a device of the above type, are plotted over time. Here the "anaerobic threshold" was defined as the point in which a steep rise of the breathing equivalent O.sub.2 is registered without the curve for the breathing equivalent CO.sub.2 rising. For determination of the "anaerobic threshold", however, it is still necessary to ascertain the lactate in the blood of the person under strain (H. A. Davis and G. C. Gass: The anaerobic threshold as determined before and during lactic acidosis, European Journal of Applied Physiology, Springer-Verlag 1981).
It is furthermore proposed that a fixed blood lactate concentration be given (J. A. Davis u.a.: Does the gas exchange anaerobic threshold occur at a fixed blood lactate concentration of 2 or 4 m/M?, International Journal Sports Medicine 4 (1983), S. 89-93, Georg Thieme Verlag Stuttgart). In this case the breathing equivalent O.sub.2 ##EQU3## and the breathing equivalent CO.sub.2 ##EQU4## are again measured and a systematic rise of the breathing equivalent O.sub.2 is defined as the "anaerobic threshold" when the breathing equivalent CO.sub.2 does not undergo any marked rise at this point. This evaluation does however involve major inaccuracies and does not permit the determination of the "individual anaerobic threshold".
The problem underlying the present invention is to permit the determination of the individual anaerobic threshold of a human being without having to continually determine the lactate by taking blood samples. It should be possible to determine the individual anaerobic threshold with high precision.
SUMMARY OF THE INVENTION
The problem is solved in accordance with the invention in that the previously described device is used for determination of the individual anaerobic threshold, where the computer unit uses the respiratory measuring quantities of respiratory minute volume V.sub.e2 of the O.sub.2 content of respiratory volume V.sub.O2 and of the CO.sub.2 content of respiratory volume V.sub.CO2 according to an algorithm ##EQU5## to permit determination
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Cohen Lee S.
Huang Stephen
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