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Use of arterialized venous blood sampling during incremental exercise tests
P McLoughlin1, P Popham, R A Linton
1Laboratory of Applied Physiology, United Medical School, St. Thomas's Hospital, London, United Kingdom.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|September 1, 1992
Summary
Arterialized venous blood accurately estimates arterial blood values during incremental exercise tests. This finding simplifies physiological monitoring during dynamic exercise conditions.
Area of Science:
- Exercise Physiology
- Clinical Chemistry
Background:
- Previous studies confirmed agreement between arterialized venous and arterial blood during steady-state exercise.
- Physiological monitoring during dynamic exercise presents unique challenges.
Purpose of the Study:
- To compare arterialized venous and arterial blood measurements during incremental exercise.
- To assess the accuracy of arterialized venous blood for estimating arterial values under dynamic conditions.
Main Methods:
- Eight healthy subjects performed an incremental cycle ergometer test to exhaustion.
- Simultaneous arterial and arterialized venous blood samples were collected at each workload.
- Key parameters analyzed included pH, PCO2, K+, lactate, pyruvate, and epinephrine.
Main Results:
- High correlation (r=0.97-0.99) was found between arterialized venous and arterial values for all measured variables.
- Linear regression confirmed the strong agreement between the two sampling methods.
- Arterialized venous measurements provide accurate estimates of arterial blood values.
Conclusions:
- Arterialized venous blood sampling is a reliable method for estimating arterial blood values during incremental exercise.
- This method can be used for physiological monitoring, simplifying procedures during dynamic exercise.
- The assumption that arterialized venous values equal arterial values is valid for many applications during incremental exercise testing.