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The Cardiovascular System

Cardiac responses to exercise and recovery

  • 3 things to know
  • Component 01

Overview

The anticipatory rise, heart rate in submaximal and maximal exercise and recovery, estimated maximum heart rate, the stroke volume plateau, Starling's law, trained and untrained maximal cardiac output, and worked calculations for a runner and a cyclist.

What you need to know

Answer each one before you reveal it.

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Key term

How does heart rate respond to maximal exercise and then during recovery?

Key term

Why does heart rate rise before exercise begins?

Key term

Describe how heart rate responds to submaximal exercise.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    Why does heart rate rise before exercise begins?

    Model answer

    Anticipation causes adrenaline to be released before exercise starts. Adrenaline acts on the SA node to raise heart rate, which is called the anticipatory rise.

  2. 2

    Describe how heart rate responds to submaximal exercise.

    Model answer

    Heart rate rises rapidly at the start of submaximal exercise. Heart rate then levels off at a steady state where oxygen supply meets demand.

  3. 3

    Describe how heart rate responds to maximal exercise.

    Model answer

    Heart rate rises rapidly and keeps climbing throughout maximal exercise. Heart rate approaches the performer's maximum and does not reach a steady state.

  4. 4

    Describe how heart rate changes during recovery.

    Model answer

    Heart rate falls rapidly at first once exercise stops. Heart rate then falls more slowly towards resting levels, staying raised while recovery continues.

  5. 5

    Calculate the estimated maximum heart rate of a 17-year-old.

    Model answer

    The estimated maximum heart rate is 203 bpm. Maximum heart rate = 220 − age = 220 − 17 = 203 bpm.

  6. 6

    How does stroke volume respond as exercise intensity increases?

    Model answer

    Stroke volume rises as intensity increases, up to about 40–60% of maximal intensity. Stroke volume then plateaus as the heart has less time to fill.

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Skeletal and Muscular Systems
The Cardiovascular System
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Energy for Exercise

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