# Investigating the effect of exercise on the heart rate and recovery time.

Investigating the effect of exercise on the heart rate and recovery time.

There are different factors that affect the heart rate, they are the variables….

I have decided to go for distance run for our variable. I decided that the variables such as fitness and individual involved would be too hard to measure fairly.

## METHOD

As I decided to use distance run as my variable and I am going to use Mark as my ‘Guinea Pig’, so I am going to make Mark run 20 meters, 40 meters, 60 meters, 80 meters and 100 meters. I am going to change the distance run 5 times. I am going to record his resting heart rate, his heart rate straight after exercise and time how long it takes for him to recover. To make sure that my results are reliable and correct. I am going to take the average of these two sets of results and use the average for my graph and my final result.

For this experiment I am going to use…

• A heart rate monitor, to measure Marks heart rate – this consists of a belt and a transmitter belt. The belt is moistened so it can read the heart rate easier, then it is placed around the chest. The watch is fastened to the wrist where it picks up the heart rate from the belt. You must make sure that you don’t stand too close to someone else using the belt because you may pick up their signal.
• A tape measure, to work out how far he has to run. We will be measuring in metres.
• A stop clock, to time how long it takes his heart rate to return to normal, we will measure the time in minutes and seconds.

To make this a fair test I am going to only use one variable and control all of the other variables, like the person doing the exercise and the type of exercise and I am going to ask him to run at his normal pace instead of jogging or sprinting. I am going to make sure I use the same person each time because people come I all sorts of shapes and sizes, so some people can run faster than others and some people are fitter than others. Also I am going to make sure the person tries to stay the same speed because sprinting needs more energy than say, jogging so the heart rate will go up when some on is sprinting. I am going to keep the type of exercise the same as well because on type of exercise may need more energy than another so the heart rate will be different.

## PREDICTION

I predict that further Mark runs the higher his heart rate will get and the longer it will take for his heart rate to return to normal. Because the further Mark runs the more oxygen his muscles need. This is because when he is working hard his body needs more energy to keep going. His body gets this energy from glucose and oxygen. The word equation for this reaction is…

GLUCOSE + OXYGEN          CARBON + WATER + ENERGY

DIOXIDE

When he is resting he still needs to use his energy and use this reaction but at a normal, ...

#### Here's what a teacher thought of this essay

This investigation into the effect of changing the running distance on heart rate and recovery time is a competent piece of GCSE work which reflects a good understanding of basic exercise physiology. The writer presents a clear account of the theory, method and results. It could certainly have been improved in the following ways: [1] Use of standard scientific terminology when discussing variables (independent, dependent, controlled); [2] A more detailed discussion of controlled variables including some indication of how the subject would rest between trials; [3] A more detailed analysis of the data with references to specific results to support the conclusions made. Overall, 3 stars.