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The equilibrium CO2 rebreathing method does not affect resting or exercise blood pressure
M J Turner1, H Tanaka, D R Bassett
1Exercise Science Unit, University of Tennessee-Knoxville 37996-2700, USA.
Medicine and Science in Sports and Exercise
|July 1, 1996
Summary
The CO2 rebreathing technique accurately measures cardiac output without affecting blood pressure. This noninvasive method is valid for calculating total peripheral resistance during rest and exercise up to 50% VO2peak.
Area of Science:
- Physiology
- Cardiovascular Research
Background:
- The equilibrium CO2 rebreathing technique is a common noninvasive method for determining cardiac output.
- This technique, combined with auscultatory blood pressure, is used to calculate total peripheral resistance.
Purpose of the Study:
- To investigate whether the CO2 rebreathing procedure significantly impacts blood pressure measurements.
- To validate the use of CO2 rebreathing with auscultatory blood pressure for total peripheral resistance calculations.
Main Methods:
- 10 healthy male subjects participated in two trials: one with CO2 rebreathing and one without.
- Both trials included three stages: rest, 25% VO2peak, and 50% VO2peak, each lasting 15 minutes.
- CO2 rebreathing was administered during the 10th minute of each stage in the rebreathing trial.
Main Results:
- No statistically significant differences were observed in heart rate, systolic blood pressure, diastolic blood pressure, or mean arterial blood pressure between the two trials.
- The CO2 rebreathing technique did not alter auscultatory blood pressure readings.
Conclusions:
- The equilibrium CO2 rebreathing technique is a valid method for noninvasive cardiac output determination.
- This technique does not affect auscultatory blood pressure measurements during rest and exercise up to 50% VO2peak, supporting its use for total peripheral resistance calculations.