The Claim
Endurance-trained athletes exhibit a 63% greater increase in stroke volume during exercise at a heart rate of 140 beats per minute compared to untrained individuals, indicating enhanced diastolic filling capacity as a key determinant of superior cardiac output during physical stress.
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.
Athletes who train for endurance have a 63% larger increase in the amount of blood their heart pumps per beat during exercise at 140 beats per minute than untrained people, even when their heart rates are the same, due to greater filling of the heart during relaxation.
See the scientific wording
Endurance-trained athletes exhibit a 63% greater increase in stroke volume during exercise at a heart rate of 140 beats per minute compared to untrained individuals, despite similar heart rates, indicating enhanced diastolic filling capacity as a key determinant of superior cardiac output during physical stress.
Endurance training makes the heart's main pumping chamber larger and more stretchy, so it can hold more blood. At rest, the heart beats slower, giving more time for blood to fill the chamber. During exercise, the chamber fills faster because it can stretch more easily, pulling in more blood even when the heart beats faster, which allows it to pump out more blood with each beat.
What the research says
1 studyStudy: Exercise echocardiography for improved assessment of diastolic filling dynamics
The study directly measured stroke volume in matched groups of endurance athletes and untrained individuals during standardized exercise intensities. The consistent, significant difference in stroke volume at matched heart rates (HR140) demonstrates a clear descriptive association between endurance training and enhanced cardiac output capacity.
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.