The Study
Echocardiographic Doppler assessments of left ventricular filling and ejection during upright exercise in endurance athletes
This study watched how athletes' hearts worked during biking and measured what changed. It doesn't prove that exercise causes these changes—it just shows what happened in these 24 people.
Analysis score
Maximum 44 for a cross-sectional study.
Where the score came from
When elite athletes ride a bike hard, their hearts squeeze and fill much faster than normal to keep up with the demand for oxygen.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 527 / 100
Quality score
Snapshots of a population at a single point in time, or descriptions of small groups. Can identify correlations and prevalence, but cannot determine cause and effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1This huge speed-up lets the heart pump more blood to muscles during intense exercise, which helps athletes perform at high levels.
- 2At rest, blood flows into the heart at 185 mL per second.
- 3During hard exercise, it jumps to 986 mL per second — a fivefold increase.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Clinical Physiology and Functional Imaging
Year
2007
Authors
M. Sundstedt, P. Hedberg, T. Jonason, I. Ringqvist, E. Henriksen
Related Content
Claims (4)
During exercise, endurance athletes have a shorter cardiac cycle than non-athletes, with both the time the heart spends pumping blood and the time it spends filling with blood reduced more significantly.
In healthy male endurance athletes, the rate at which blood fills the left ventricle of the heart rises from 185 mL per second at rest to 986 mL per second during intense cycling at 160 beats per minute, a fivefold increase.
When healthy male endurance athletes exercise on a stationary bike at a heart rate of 160 beats per minute, the time the heart takes to fill with blood decreases by 73%, the time it takes to pump blood out decreases by 31%, the speed of blood flow through the aorta doubles, the speed of blood flow through the mitral valve more than doubles, and the rate at which the left ventricle fills with blood increases fivefold compared to resting conditions.
When healthy male endurance athletes ride a bicycle at a heart rate of 160 beats per minute, the pressure difference across the mitral valve increases by a factor of ten, indicating a larger force pushing blood into the left ventricle.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.