A generalized arterial transfer function derived at rest underestimates augmentation of central pressure after...

Area of Science:

• Cardiovascular Physiology
• Exercise Physiology
• Biomedical Engineering

Background:

• Central blood pressure is a more accurate predictor of cardiovascular health than peripheral blood pressure.
• Non-invasive methods for measuring central blood pressure during exercise are limited.
• Transfer functions (GTF) estimate central blood pressure from peripheral measurements.

Purpose of the Study:

• To determine if a resting peripheral-to-central arterial GTF accurately estimates central blood pressure after aerobic exercise.
• To assess the efficacy of an exercise-specific GTF for central blood pressure estimation post-exercise.

Main Methods:

• Thirty healthy men underwent 15-minute bicycle exercise.
• Carotid and radial artery waveforms were recorded pre- and post-exercise.
• Radial-to-carotid GTF was calculated at rest and post-exercise to derive central systolic blood pressure (SBP) and augmentation index (AIx).

Main Results:

• The resting GTF significantly underestimated central SBP and AIx immediately and 10 minutes post-exercise.
• No bias was observed when using the resting GTF at rest.
• An exercise-specific GTF showed no bias post-exercise but overestimated values at rest.

Conclusions:

• A peripheral-to-central arterial GTF derived at rest is inaccurate for estimating central arterial pressure after exercise.
• An exercise-specific GTF can improve the accuracy of central blood pressure and AIx estimations following aerobic exercise.