1. Name: Jesse
Partners: Ji Yong and Si Jun
Date of experiment: 16/3/11
Recovery time (lab report)
Aim: To find out how long does it take a person’s heart rate recovered after exercising 1
minutes.
Hypothesis: If a person runs more(length of time),then it will take longer to recover to its
resting heart rate. It is like 2 balls drop on the ground. Because If one ball is higher, one
ball is lower, in the same speed, same pressure and same weight, the lower one will hit
the ground first.
Variables:
Input variable: The length of time that the person runs.(minute) Change the
length of the time,1 min, 2 min and 3 min.
Output variable: recovery time of heart rate. Measuring by letting a person run,
and then see how long does it take the person’s heart rate recover to resting heart rate.
Control variables:
Control variable 1: Starting heart rate. Test runner’s heart rate, every
time before he runs.
Control variable 2: same person. let the runner run through whole test.
Control variable 3: Same weather. Test it in same day.
Materials:
sensor for testing heart rate. (if we don’t have it, we will use stop watch.)
water
A person to run.
The person to calculates runner’s resting heart rate.
A person to start/stop the stop watch.
A person to takes notes
a place to test (running space)
appropriate foot wear (running shoes)

2. Method:
1. Calculate Runner’s resting heart rate (BPM). using sensor
2. Then the person will run for 1 minute.
3. Measure the time for the heart rate to return to the resting heart rate. But First
we will see his resting rate every 30 seconds, then it will be like 0:30,1:00,1:30…
(using sensor) (do not stop stopwatch.)
4. Repeat 3 times for average Data.
5. Confirm Runner’s heart rate before he runs (BPM). using sensor
6. Then the person runs 2 mins.
7. Measure the time for the heart rate to return to the resting heart rate. But First
we will see his resting rate every 30 seconds, then it will be like 0:30,1:00,1:30…
(using sensor) (do not stop stopwatch.)
8. Repeat 3 times for average Data.
9. Confirm Runner’s heart rate before he runs (BPM). But First we will see his
resting rate every 30 seconds, then it will be like 0:30,1:00,1:30… using sensor
10.Then the person runs 3 mins.
11.Measure the time for the heart rate to return to the resting heart rate. But First
we will see his resting rate every 30 seconds, then it will be like 0:30,1:00,1:30… (using
sensor) (do not stop stopwatch.)
12. Repeat 3 times for average Data.
Results:
Recovery Time (min)
Minutes of Running Trial 1 Trial 2 Trial 3 Avg
(min) (min) (min) (min) (min)
1 2 4 5 5.5 min
2 10 6 6 7.3 min
3 7 8 4 6.3 min
Resting heart rate (bpm)
Trial 1 Trial 2 Trial 3 Avg
(bpm) (bpm) (bpm) (bpm)
1 80 70 60 70

3. Recovery time graph
8.0
7.2
Recovery time
6.4
5.6
4.8
4.0
3.2
2.4
1.6
0.8
0
1 2
Time execising 3
Conclusion:
According to the data, the hypothesis is not correct, the length of the time of
running doesn’t relate to the time of recovery. Because, the average of the runner’s
recovery time in running 3 minutes is shorter than the average of runner’s in running 2
minutes. If the hypothesis is correct, then recovery time in 3 minutes shouldn’t be lower
than recovery time in 2 minutes. There is a relationship between input and output
variable, because the more a person run, the faster the person heart bumps, then the
recovery time is longer.The part of the data is reliable because the data was test in
different days. The reliable part is the resting heart rate and 1 min and 2 min’s recovery
time(include avg).Because3 minutes running was test in another day, so it is not
accurately. The most difficult thing to measure is recovery time. Because no one can
control the emotion of itself,when the runner was recovering,the runner might be anxious
or nervous, then this will cause the runner’s heart bumps faster.

4. Evaluation:
This lab is successful. One part of the method that went really well was resting
heart rate. Because science lab is in 3rd floor, testing place is on 1st floor, so the runner’s
resting heart rate is tested at 1st floor. Walking and doing any movements will increase
the resting heart rate. Some things that could be changed for next time are: let runner sit
in same position when runner was testing heart rate after exercising, do not let runner
walk to a seat when testing and testing should be in the same day. One thing that can’t
control is the runner’s emotion, because when runner was recovering,the runner might be
anxious or nervous, then this will cause the runner’s heart bumps faster. In a future
experiment,the input variable could be different exercises, like walking or running.