The Claim
Young elite endurance athletes, specifically marathon runners, exhibit increased left ventricular longitudinal systolic strain and strain rates compared to sedentary individuals, as measured by speckle tracking echocardiography.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Marathon runners have stronger heart muscle contractions in the left ventricle than sedentary people, as measured by speckle tracking echocardiography.
See the scientific wording
Young elite endurance athletes, specifically marathon runners, exhibit increased left ventricular longitudinal systolic strain and strain rates compared to sedentary individuals, as measured by speckle tracking echocardiography, suggesting enhanced myocardial contractile performance associated with chronic endurance training.
Endurance training causes heart muscle cells to add more contractile units in a line, allowing the heart to squeeze more forcefully and efficiently. These cells also become better at moving calcium in and out, which makes each contraction stronger and faster.
What the research says
1 studyMarathon runners have stronger heart muscle contractions than non-athletes, but regular heart scans can't see it — only special ultrasound tech called speckle tracking can. The study found this advanced tech shows their hearts squeeze better.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.