Key result
Supine ergometer exercise linked to active aortic root constriction, reducing end-systolic diameter by ~0.2 cm.
Why the study?
The changes in the aortic pressure-diameter relationship during exercise in healthy men were not well characterized.
Does supine ergometer exercise alter the aortic pressure-diameter relationship in healthy men?
Observational (n=14)
No
Does supine ergometer exercise alter the aortic pressure-diameter relationship in healthy men?
Exercise induces active constriction of the aorta alongside arteriolar dilatation, suggesting an active physiological mechanism to facilitate peripheral blood flow.
Answers are grounded in this paper and cite their sources.
Exercise-induced aortic shifts in healthy men should not change practice; leaves open relevance to patients with vascular disease.
In order to investigate the change of the aortic pressure-diameter relationship during exercise, M-mode echograms and/or two-dimensional echograms of the aortic root and of the abdominal aorta were taken before and during supine ergometer exercise in 15 healthy men. The difference of the angle of the ultrasonic beam to the aorta between before and during exercise was too small to influence the measured values. The exercise, which elevated heart rate to 100 beats/min, caused a shift of the pressure-diameter relationship curve of the aortic root to a lower diameter (on an average, end-systolic diameter: from 3.1 to 2.9 cm, p less than 0.001; end-diastolic: from 2.9 to 2.7 cm, p less than 0.001). This was also seen in the abdominal aorta. Stroke volume showed no change during exercise. Total peripheral vascular resistance decreased. Central aortic volume decreased. In conclusion, exercise induces active constriction of aorta with dilatation of arterioles. This might be beneficial to push the blood into the peripheral tissues.
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Sugishita et al. (1982) conducted an observational in Healthy (n=14). Supine ergometer exercise vs. Rest was evaluated on Aortic root end-systolic diameter (MD -0.2 cm, p=<0.001). Supine ergometer exercise induced active constriction of the aorta, significantly reducing aortic root end-systolic diameter from 3.1 cm at rest to 2.9 cm during exercise (p<0.001).
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