The Claim
Endurance training does not increase peak myocardial blood flow per gram of myocardium during maximal exercise, as maximal exercise-induced myocardial blood flow is similar between untrained and endurance-trained men.
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.
Endurance training does not result in higher blood flow through the heart muscle per gram of tissue during maximum exercise, even though the hearts of trained individuals are larger and pump more blood overall.
See the scientific wording
Endurance training does not increase peak myocardial blood flow per gram of myocardium, as maximal exercise-induced flow was similar between untrained (5.0 ± 1.5 mL/g/min) and endurance-trained men (4.5 ± 1.7 mL/g/min, p = 0.6), despite greater cardiac mass and stroke volume in trained individuals.
During intense exercise, the heart muscle uses all the oxygen it can pull from the blood, and the number of tiny blood vessels in the heart is already high enough to deliver the maximum possible blood flow per gram of tissue. Making the heart bigger doesn't increase how much blood each gram can get because the system is already running at its top capacity.
What the research says
1 studyStudy: Estimated exercise‐induced maximal myocardial blood flow in untrained and endurance‐trained men
Even though athletes have bigger hearts and pump more total blood, the amount of blood flowing through each tiny piece of heart muscle during maximum effort is about the same as in non-athletes. So training doesn’t make the heart muscle itself get more blood per gram.
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.