Heart Rate whilst training

Question 1

Effect of exercise on cardiac output - how will cardiac output increase and what is its max?

Answer 1

Cardiac output will increase linearly until maximum exercise capacity where it will plateau
During maximum exercise, cardiac output may reach values of between 4-8 times resting values
20-40l/m

Question 2

Stroke volume response to exercise

Answer 2

SV increases linearly with increasing intensity, this only happens up to 40 -60% of maximum effort. After which stroke volume plateaus. Reason for this is shorter diastolic phase (ventricular)
able to increase becauses of increased venous return and starlings law

Question 3

Explain this picture

Answer 3

Prior to exercise there is an increase in heart rate, this is known as the ‘anticipatory rise’ and is a result of the release of adrenaline

Heart rate will increase but by how much and the speed at which is dependent upon the intensity of the exercise.

Typically it will increase in a linear fashion in direct proportion to exercise intensity
Sub-maximal exercise – this will see an increase and there is likely to be a plateau. Which represents the demand for O2 is being met by the O2 supply

Question 4

Explain this picture

Answer 4

Maximal exercise – this will see an increase at a faster rate initially and then slow down. Once the event is over with the heart rate will initially decrease rapidly and then slow down