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Related Experiment Video

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In Vitro Model of Physiological and Pathological Blood Flow with Application to Investigations of Vascular Cell Remodeling

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Blood flow dynamics in heart failure.

J K Shoemaker¹, H L Naylor, C S Hogeman

¹Department of Medicine, Section of Cardiology, Pennsylvania State University College of Medicine, Hershey, PA, USA. kshoemak@gcrc.hmc.psghs.edu

|June 15, 1999

Summary

This summary is machine-generated.

Heart failure (HF) patients show increased muscle glycolysis during exercise. Reduced forearm vascular conductance during strenuous exercise suggests enhanced vasoconstriction contributes to fatigue in HF.

Keywords:

NASA Discipline Cardiopulmonary Non-NASA Center

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Area of Science:

Cardiovascular Physiology
Skeletal Muscle Metabolism
Heart Failure Pathophysiology

Background:

Exercise intolerance in heart failure (HF) is linked to impaired vasodilation, increased vasoconstriction, and altered muscle metabolism.
These factors contribute to the fatigue experienced by HF patients during physical activity.

Purpose of the Study:

To investigate the vascular and metabolic responses to rhythmic forearm exercise in patients with heart failure (HF) compared to healthy controls.
To examine the impact of HF on the time course of oxygen delivery versus uptake during exercise.
To assess vasoconstriction during exercise, particularly the metaboreflex, in HF patients.

Main Methods:

Two exercise protocols were used on 9 HF patients and 9 control subjects (CTL).
Protocol 1 assessed oxygen delivery and uptake dynamics.
Protocol 2 evaluated vasoconstriction during ischemic forearm exercise to evoke a metaboreflex.

Main Results:

HF patients exhibited higher venous lactate and H+ levels at 4 minutes of exercise compared to CTL, despite similar blood flow and oxygen uptake.
Mean arterial pressure responses to ischemic exercise were comparable between groups.
HF patients showed reduced forearm blood flow and vascular conductance during ischemic exercise compared to ambient exercise, unlike controls.

Conclusions:

Augmented glycolytic metabolic responses to moderate exercise in HF are attributed to intrinsic skeletal muscle differences, not solely vasodilatory dynamics.
The inability to increase forearm vascular conductance during strenuous ischemic exercise in HF suggests enhanced vasoconstriction contributes significantly to exertional fatigue.