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The optimised CO-rebreathing method: a new tool to determine total haemoglobin mass routinely

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Abstract

A routine method to determine total haemoglobin mass (tHb) in clinical practice and sports medicine is non-existent. Radioactive tracers or other dilution procedures like the common CO-rebreathing method (Proccom) are impractical, the latter in particular because of the relatively long time of respiration. According to the multicompartment model of Bruce and Bruce (J Appl Physiol 95:1235–1247, 2003) the respiration time can be considerably reduced by inhaling a CO-bolus instead of the commonly used gas mixture. The aim of this study was to evaluate this theoretical concept in practice. The kinetics of the HbCO formation were compared in arterialised blood sampled from an hyperaemic earlobe after inhaling a CO-bolus (Procnew) for 2 min and a CO–O2 mixture (Proccom) for ∼10 min. The reliability of Procnew was checked in three consecutive tests, and phlebotomy was used to determine the validity. VO2max was determined with and without previous application of Procnew and the half-time of HbCO was registered also in arterialised blood after resting quietly and after the VO2max test. Procnew yielded virtual identical tHb values compared to Proccom when HbCO determined 5 min after starting CO-rebreathing was used for calculation. The typical error of Procnew was 1.7%, corresponding to a limit of agreement (95%) of 3.3%. The loss of 95 g (19) haemoglobin was detected with an accuracy of 9 g (12). After application of Procnew VO2max was reduced by 3.0% (3.7) (P=0.022) and half-time was lowered from 132 min (77) to 89 min (23) after the VO2max test. Inhaling a CO-bolus markedly simplifies the CO-rebreathing method without reducing validity and reliability and can be used for routine determination of tHb for various indications.

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Acknowledgements

The project was supported by the German Federal Institute of Sports Sciences (BISp,# VF 0407/03/42). The authors wish to thank Mrs. H. Gaisser, Mr. A. Beller, Mr. A. Schmeiduch and Mr. M. Gebert for their excellent technical assistance.

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  1. Department of Sports Medicine and Sports Physiology, University of Bayreuth, Universitätsstrasse 30, 95440, Bayreuth, Germany

    Walter Schmidt & Nicole Prommer

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  1. Walter Schmidt
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  2. Nicole Prommer
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Correspondence to Walter Schmidt.

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Schmidt, W., Prommer, N. The optimised CO-rebreathing method: a new tool to determine total haemoglobin mass routinely. Eur J Appl Physiol 95, 486–495 (2005). https://doi.org/10.1007/s00421-005-0050-3

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