Why the study?
Does the CO2 rebreathing method provide reproducible and valid estimates of cardiac output during tethered swimming in highly trained swimmers?
Does the CO2 rebreathing method provide reproducible and valid estimates of cardiac output during tethered swimming in highly trained swimmers?
The CO2 rebreathing method is a reproducible and valid technique for estimating cardiac output during high-intensity tethered swimming.
May support CO2 rebreathing for cardiac output assessment in swimmers; leaves open validation in clinical populations and settings.
The reproducibility of cardiac output (Q) estimated by the CO2 rebreathing method during tethered swimming was studied in five highly trained college swimmers. The reproducibility of the CO2 rebreathing method for estimations of Q during tethered swimming was similar to the reproducibility reported for the CO2 rebreathing method, direct Fick method, or dye-dilution method during either cycling or treadmill walking. All duplicate estimates of Q by the CO2 rebreathing method were within 15% of one another. A comparison was made between the Q's estimated by the CO2 rebreathing method during tethered swimming and previously published data on Q determined by the dye-dilution method during free swimming in a flune. At any given oxygen uptake, Q obtained by the CO2 rebreathing method during tethered swimming was not significantly different from the Q obtained by the dye-dilution method during flume swimming. Estimates of Q by the CO2 rebreathing method made during high intensities of tethered swimming were reproducible and appear to be valid.
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Heigenhauser et al. (1978) studied this question.
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