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    Home » Science Experiments for Kids » How does exercise affect heart rate?

    How does exercise affect heart rate?

    June 30, 2016 By Emma Vanstone 5 Comments

    How does exercise affect heart rate?

    This activity is a great way to introduce correct scientific procedures, thinking about variables to change and keep constant.

    Exercise increases the rate at which energy is needed from food, increasing the need for both food and oxygen by the body. This is why when we exercise both pulse/heart rate and breathing rate increase.

    Pulse rate is  an indication of your heart rate as your arteries expand each time the ventricles pump blood out of the heart.

    The heart speeds up to pump extra food and oxygen to the muscles, while breathing speeds up to get more oxygen into the body and remove carbon dioxide.

    Stethoscope and timer for a heart rate investigation

    How does exercise affect heart rate investigation

    Step 1

    Use the stethoscopes and timers to record how many heartbeats you can hear in 30 seconds.

    Step 2

    Exercise – this could be 30 seconds of star jumps or a mini obstacle course. 

    Step 3 

    Use the timers and stethoscopes again to record how many heartbeats you can hear in 30 seconds.

    Let’s think scientifically

    A scientific investigation should be a fair test, think about what conditions you need to keep the same and what condition you will change. You should also repeat the testing 3 times and find the average heart rate.

    Things to keep the same:

    Heartbeats must be counted before and after exercising for the same amount of time.

    The person whose heart rate is compared must be the same.

    Things to change: 

    Heart rate should be measured before and after exercise.

    Make a prediction

    What effect do you think exercise will have on heart rate?

    Why do you think this?

    Clue – when you exercise your muscles need more food and oxygen from your blood, so your heart has to beat faster to transport them.

    What is recovery time? 

    Recovery time is the time taken for heart rate to return to normal. If you have time, can you work out how long this is for you?

    The pulse rate and breathing rate of a fitter person rise much less than in an unfir person during exercise, fitter people also have a shorter recovery time.

    Links to Maths

    Design a method of recording your results? Can you work out the average heart rate for 10 participants before and after exercise?

    Calculate the difference between a person’s heart rate before and after exercise.

    Links to English

    Can you write a letter to a friend telling them about your findings?

    More Science for Kids

    Find out how to make your own stethoscope with a funnel, tape and cardboard tube.

    Make a pumping model of a heart, or try one of our sports science investigations.

    Exercise and Heart Rate Investigation

    Suitable for:

    Key Stage 1 Science: Animals including Humans

    Describe the importance for humans of exercise, eating the right amounts of different types of food, and hygiene.

    Key Stage 2 Science: Animals including Humans

    Recognise the impact of diet, exercise, drugs and lifestyle on the way their bodies function

    Last Updated on June 17, 2021 by Emma Vanstone

    « How much sugar is in kid’s drinks?
    Everything you need for a great science morning #scienceshare »

    Safety Notice

    Science Sparks ( Wild Sparks Enterprises Ltd ) are not liable for the actions of activity of any person who uses the information in this resource or in any of the suggested further resources. Science Sparks assume no liability with regard to injuries or damage to property that may occur as a result of using the information and carrying out the practical activities contained in this resource or in any of the suggested further resources.

    These activities are designed to be carried out by children working with a parent, guardian or other appropriate adult. The adult involved is fully responsible for ensuring that the activities are carried out safely.

    Reader Interactions

    Comments

    1. tyrone

      March 05, 2018 at 8:06 am

      hi my name is tyrone

      Reply
    2. Jamie

      January 22, 2019 at 2:33 pm

      helpful thanks!

      Reply
    3. Reece

      February 23, 2019 at 7:51 am

      This was extremely helpful for a school task, thx

      Reply
    4. Ezekiel

      April 02, 2019 at 3:37 pm

      It is for my science fair

      Reply
    5. Shaun

      September 29, 2019 at 10:29 am

      Helps a lot for science project.

      Reply

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