Heart rate, stroke volume and cardiac output

Stroke volume

the volume of blood ejected from the left ventricle per beat 

Cardiac output

the volume of blood ejected from the left ventricle per minute 

Heart rate

the number of beats of the heart per minute 

Equation for cardiac output 

SV x HR = CO 

HR in trained performers and untrained performers

• Trained performers have a lower heart rate  

• Untrained performers have a higher heart rate  

SV in trained performers and untrained performers

• Trained performers have higher stroke volume  

• Untrained performers have a lower stroke volume 

Factors that affect stroke volume

• Venous return

• Elasticity and contractility refers to the degree of stretch in the cardia muscle fibres. The greater the stretch the greater the force of contraction – this will raise stroke volume  

Venous return

The volume of blood returning to the heart. The greater the return of blood to the heart the greater the volume of blood available in the ventricles for ejecting

Untrained performer HR, SV and CO

Trained performer HR, SV and CO

What is the term that describes the hearts ability to generate it’s own electrical impulse?

Myogenic 

What does bradycardia mean?

Abnormally low heart rate