The Claim
Adenosine-induced myocardial blood flow is significantly lower in endurance-trained men (2.3 ± 0.9 mL/g/min) than in untrained men (3.9 ± 1.4 mL/g/min), indicating reduced pharmacological vasodilatory capacity despite greater cardiac structure.
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-trained men have lower blood flow in the heart in response to adenosine compared to untrained men, showing a reduced ability of blood vessels to widen under pharmacological stimulation, even though their hearts are larger.
See the scientific wording
Adenosine-induced myocardial blood flow is significantly lower in endurance-trained men (2.3 ± 0.9 mL/g/min) than in untrained men (3.9 ± 1.4 mL/g/min), indicating reduced pharmacological vasodilatory capacity despite greater cardiac structure.
Endurance training causes the heart's blood vessels to grow larger and more numerous, but this makes them less able to widen further when a drug like adenosine tries to open them. The vessels also become less sensitive to adenosine, so they don't respond as strongly to signals that should increase blood flow.
What the research says
1 studyStudy: Estimated exercise‐induced maximal myocardial blood flow in untrained and endurance‐trained men
Even though athletes have bigger, stronger hearts, when given a drug meant to open heart blood vessels as wide as possible, their hearts don’t get as much blood flow as non-athletes’ hearts do. So their blood vessels don’t open as much in response to the drug.
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.