Echocardiographic Doppler assessments of left ventricular filling and ejection during upright exercise in endurance athletes
| Autor: | Milena Sundstedt, Pär Hedberg, Tommy Jonason, Ivar Ringqvist, Egil Henriksen |
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| Rok vydání: | 2007 |
| Předmět: |
Adult
Male medicine.medical_specialty animal structures Physiology Heart Ventricles Physical Exertion Posture Physical exercise Doppler echocardiography symbols.namesake Physiology (medical) Internal medicine Image Interpretation Computer-Assisted Humans Ventricular Function Medicine biology medicine.diagnostic_test Athletes business.industry Stroke Volume General Medicine biology.organism_classification Echocardiography Doppler Exercise Test Physical Endurance cardiovascular system symbols Physical therapy Cardiology business Ventricular filling Doppler effect |
| Zdroj: | Clinical Physiology and Functional Imaging. 27:36-41 |
| ISSN: | 1475-097X 1475-0961 |
| DOI: | 10.1111/j.1475-097x.2007.00715.x |
| Popis: | Doppler echocardiography was used to describe left ventricular filling and ejection during upright bicycle exercise in 24 healthy male endurance athletes. The transmitral pressure gradient was estimated and isovolumetric relaxation, filling and ejection time and transmitral and aortic flow velocities were measured at rest and during exercise. From rest to peak exercise (at a heart rate of 160 bpm), the mean left ventricular filling time was shortened by 73%, the ejection time by 31%, while the isovolumetric relaxation time was shortened by 62%. At peak exercise, the maximum aortic flow velocity almost doubled and the maximum transmitral flow velocity more than doubled, with a tenfold increase in the mean transmitral pressure gradient. The increase was significant (P0.001) at each level of exercise. The left ventricular filling rate measured as volume per time was 185 +/- 62 ml s(-1) at rest and it increased to 986 +/- 192 ml s(-1) at peak exercise. This study demonstrates large changes in diastolic filling indices during upright exercise and it shows that the heart is able to increase its filling rate five times from rest to peak exercise. |
| Databáze: | OpenAIRE |
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