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Related Experiment Video

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Surgical Placement of Catheters for Long-term Cardiovascular Exercise Testing in Swine

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Blood flow patterns during incremental and steady-state aerobic exercise.

Daniel Coovert¹, LeVisa D Evans¹, Steven Jarrett¹

¹Applied Medicine Research Center, Department of Applied Medicine and Rehabilitation, College of Health and Human Services, Indiana State University, Terre Haute, IN, USA.

The Journal of Sports Medicine and Physical Fitness

|June 1, 2017

Summary

Aerobic exercise increases endothelial shear stress (ESS) in an intensity-dependent manner. Blood flow during exercise includes both forward and backward patterns, impacting vascular health.

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Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise

Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise

Published on: February 20, 2017

Area of Science:

Physiology
Cardiovascular Health
Exercise Science

Background:

Endothelial shear stress (ESS) is crucial for vascular homeostasis, influenced by blood flow.
Exercise may benefit vascular health through ESS, but its characteristics during aerobic exercise are not well understood.

Purpose of the Study:

To characterize blood flow patterns and resulting ESS during incremental and steady-state aerobic exercise.
To determine if exercise-induced ESS is intensity-dependent and bidirectional.

Main Methods:

Six participants underwent incremental and 3-step steady-state cycle ergometer tests.
Blood flow patterns in the brachial artery were assessed using high-definition ultrasound and Doppler.
Physiological markers including oxygen uptake, heart rate, blood pressure, and lactate were monitored.

Main Results:

Antegrade (forward) blood flow velocity increased significantly with exercise intensity in both tests.
Retrograde (backward) blood flow did not significantly change during incremental exercise.
All measured physiological variables increased in an intensity-dependent manner during both exercise protocols.

Conclusions:

Exercise-induced ESS appears to increase with aerobic exercise intensity.
Aerobic exercise elicits blood flow patterns characterized by both antegrade and retrograde components.