What question did this study set out to answer?

To compare the accuracy and practicality of transthoracic impedance plethysmography against indirect Fick carbon dioxide rebreathing for estimating cardiac output at rest and during graded exercise.

July 1, 1986Journal of Applied Physiology

Comparison of two noninvasive techniques for estimating cardiac output during exercise

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Authors

DHD. D. HatcherMonash University OSO. D. Srb

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Implication

Comparative study reveals concordant cardiac output estimates between impedance plethysmography and carbon dioxide rebreathing in exercising men, indicating impedance is an efficient alternative.

Key Points

To compare the accuracy and practicality of transthoracic impedance plethysmography against indirect Fick carbon dioxide rebreathing for estimating cardiac output at rest and during graded exercise.
Evaluated 60 male participants (N=60) tested at rest and during graded cycle ergometer exercise up to 200 W.
Obtained paired cardiac output estimates using transthoracic impedance plethysmography and indirect Fick carbon dioxide rebreathing alongside oxygen consumption measurements.
Resting cardiac output measured 7.46 ± 0.35 L/min with impedance versus 5.96 ± 0.43 L/min with rebreathing, reaching 18.67 ± 0.72 L/min and 23.73 ± 0.84 L/min respectively at 200 W.
Both techniques correlated with oxygen consumption (impedance R = 0.752 vs. rebreathing R = 0.855, P < 0.001), showing a linear inter-technique correlation of R = 0.75 across all work loads without influence from lung volume on impedance measurements.

Cite This Study

Hatcher et al. (1986) studied this question.

synapsesocial.com/papers/6a76a607bf7962ca51061485 https://doi.org/10.1152/jappl.1986.61.1.155

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Implication

Comparative study reveals concordant cardiac output estimates between impedance plethysmography and carbon dioxide rebreathing in exercising men, indicating impedance is an efficient alternative.

Comparison of two noninvasive techniques for estimating cardiac output during exercise

Discussion

Member takes

Implication

Key Points

Cite This Study

Comparison of two noninvasive techniques for estimating cardiac output during exercise

Discussion

Member takes

Implication

Key Points

Cite This Study

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