The size and shape of the inferior vena cava in trained and untrained females in relation to maximal oxygen uptake
2015 (English)Manuscript (preprint) (Other academic)
Background. The increase in cardiac dimensions following endurance training is well acknowledged. A few studies report a larger inferior vena cava (IVC) in trained, predominatly male subjects while athlete-control studies upon females are lacking. Previous studies were constrained to long-axis measurements, and there are no reports in the literature on IVC short-axis dimensions and shape in athletes.
Methods and Results. Forty-eight sedentary and 46 endurance trained females (mean age 21±2 years, VO2max 39±5 vs. 52±5 mL×kg-1×min-1, p<0.001) underwent echocardiographic examination including IVC diameter and cross-sectional area measured in the subcostal view. IVC shape was calculated as the ratio of short-axis major-to-minor diameter.
Five out of eight IVC dimensions were larger in trained females, including maximal long-axis diameter (mean 24±3 vs. 20±3 mm, p<0.001) and maximal short-axis area (mean 5.5±1.5 vs. 4.7±1.4 cm2, p=0.022). Both groups presented with a slightly oval IVC with no differences between the groups in IVC shape or inspiratory decrease in any IVC dimension. The IVC long-axis diameter reflected the minor-axis diameter obtained in the short-axis view, during both expiration and inspiration. Positive correlations were seen between maximal IVC long-axis diameter and maximal oxygen uptake (r=0.52, p<0.01), left ventricular end-diastolic volume (r=0.46, p<0.01) and right atrial area (r=0.49, p<0.01).
Conclusion. The IVC was larger in endurance trained than in untrained females but showed similar shape and inspiratory decrease in dimensions. The long-axis IVC diameter was related to maximal oxygen uptake.
Place, publisher, year, edition, pages
Inferior Vena Cava, Athlete’s heart, Exercise Training, Sports Cardiology, Maximal Oxygen Uptake
Cardiac and Cardiovascular Systems
IdentifiersURN: urn:nbn:se:liu:diva-123315OAI: oai:DiVA.org:liu-123315DiVA: diva2:881436