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Left ventricular function during lower body negative pressure

M Ahmad, C G Blomqvist, C B Mullins

Aviation, Space, and Environmental Medicine

|June 1, 1977

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Lower body negative pressure (LBNP) significantly reduces left ventricular preload and stroke volume in healthy men, demonstrating a Starling effect without altering cardiac contractility. This response is linked to baroreceptor-mediated increases in systemic resistance.

Area of Science:

Cardiovascular Physiology
Human Physiology

Background:

Understanding the human heart's response to stress is crucial for cardiovascular health.
Lower body negative pressure (LBNP) is a model for simulating hypovolemia and cardiac stress.

Purpose of the Study:

To characterize left ventricular (LV) response to LBNP.
To determine the relationship between LV function and hemodynamic changes during LBNP.

Main Methods:

Echocardiography was used to measure LV end-diastolic and end-systolic diameters in 12 healthy males.
Ventricular function curves (stroke volume vs. end-diastolic volume) were generated at rest and during LBNP (-40 mm Hg).

Main Results:

LBNP caused a significant decrease in end-diastolic volume (-19%) and stroke volume (-22%).

Related Experiment Videos

No significant changes were observed in heart rate, arterial blood pressure, or end-systolic volume.

These findings indicate a Starling effect without changes in cardiac contractility.

Conclusions:

Moderate LBNP effectively reduces cardiac preload and stroke volume.
The observed hemodynamic stability suggests baroreceptor-mediated adjustments in systemic vascular resistance.
LV function adapts to volume shifts via the Frank-Starling mechanism under LBNP stress.