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Exercise central (aortic) blood pressure is predominantly driven by forward traveling waves, not wave reflection
Martin G Schultz1, Justin E Davies, Phillip Roberts-Thomson
1Menzies Research Institute Tasmania, University of Tasmania, Private Bag 23, Hobart 7000, Australia.
Hypertension (Dallas, Tex. : 1979)
|May 30, 2013
Summary
Exercise increases central blood pressure (BP) primarily due to forward traveling waves from the left ventricle, not reflected waves. Understanding these central hemodynamics is key to exercise hypertension research.
Area of Science:
- Cardiovascular Physiology
- Hemodynamics
- Exercise Physiology
Background:
- Exercise hypertension is a predictor of cardiovascular mortality.
- Central hemodynamics during exercise remain poorly understood.
- Arterial wave travel and aortic reservoir function's role in exercise central blood pressure (BP) needs clarification.
Purpose of the Study:
- To determine the contribution of arterial wave travel and aortic reservoir characteristics to central BP during exercise.
- To test the hypothesis that exercise central BP is mainly related to forward wave travel and aortic reservoir function.
Main Methods:
- Invasive pressure and flow velocity recorded in the ascending aorta during rest and exercise.
- Utilized sensor-tipped intra-arterial wires in 10 participants.
- Employed wave intensity analysis to identify wave types and calculate aortic reservoir and excess pressure.
Main Results:
- Central systolic BP significantly increased with exercise (19±12 mm Hg).
- This increase was linked to heightened forward compression and decompression waves.
- Reflected waves did not significantly increase, while excess pressure rose significantly.
Conclusions:
- Elevated central BP during exercise is mainly driven by increased aortic forward traveling waves generated by left ventricular ejection.
- Findings offer insights into central BP waveform morphology and exercise hypertension pathophysiology.
Keywords:
aortablood pressureexercisepulse wave analysisvenous reservoirswave intensitywave reflectionMore Related Videos
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