OBJECTIVE: To observe any changes to the heart rate (pulse rate) before, during and after
MATERIALS & APPARATUS: Yourself; stop watch (or anything with a timer); someone to help
you time
BACKGROUND: Heart rate is a term used to describe the frequency of the cardiac cycle. Usually
it is calculated as the number of contractions (beats) of the heart in one minute. As such heart
rate is usually expressed as "beats per minute" (bpm). The average teenager’s heart rate varies
between 70 to 100 bmp. The pulse is one way of measuring the heart rate.
Heart rate measures how fast your heart is beating and is the number of heart beats per minute;
the times per minute that the heart contracts. Average heart rate is the average of heart rates
measured during an exercise period. Recovery time is how long it takes for the heart to return
to its normal resting rate after physical activity.
METHOD: Locate your pulse on either your wrist or your neck. Sit quietly for a few minutes until
you are completely at rest. Have someone help you with timing and count the number of heart
beats (your pulse) for 1 minute. Record this value. Wait 1 minute and then take your resting
heart rate for another minute. Record this value. Do some form of VIGOROUS exercise for 2
minutes. Immediately measure your heart rate for 1 minute. Wait 1 minute and record your
heart rate for another minute. Continue this until your heart rate returns to close your preexercise/resting rate, and you get 2 consecutive readings that are very close together. Record
all these values.
You will present your results in the form of a table showing minute against heart rate. You will
also show your results with a line graph. You will then write a Discussion for this activity
explaining your results. Use the question provided as a guide as to what your discussion should
DISCUSSION QUESTIONS: (these questions are here to guide your discussion. I do not want
just the answers to these questions but a discussion explaining your results using these
questions as a guide.
1. Why is it important for the heart to pump blood around the body?
2. What does the body need for exercise? Through what process is this made? What is
needed for this process?
3. How does your heart rate change with exercise? (use you actual data to show how your
heart rate changed)
4. Why does this change take place? Why does your body respond to exercise in this way?
5. What was your recovery time? What factors could affect a person’s recovery rate?
6. Why does your heart rate take a while to return to its resting rate? Why is there a recovery
7. What is an oxygen debt? What is built up in them muscles when we need more energy
and use more O2 than the body can supply?
YOUR LAB REPORT: This report can be either hand written or typed up but your graph needs to
be on graph paper. You will hand up your lab report in class on Thursday 14 th October.
4. METHOD (written in past tense and in simple steps)
5. RESULTS – table and line graph (see below for rules for tables and graphs); work out
your average resting heart rate, your recovery time, by how much your heart rate changes
after exercise
6. DISCUSSION – you should have at least a couple of paragraphs – use your actual data to
relate your discussion to your activity
7. CONCLUSION – a simple sentence that links directly to your aim/objective that states
what your activity showed.
1. Each must have a suitable title written in capital letters and underlined
2. If drawing by hand, use pencil and rulers
3. Use the whole graph paper for drawing your graph
4. Use a suitable scale and write the scale that you used (e.g. 1cm represents 1 minute; 2cm
represents 20 bmp)
5. Label each of your axes of your graph (time in minutes; heart/pulse rate in bmp)
6. Please use a ruler to connect your points