The independent variable is the rate of exercise. Units to measure in are steps per minute. The dependent variable is my heart rate immediately after exercise. Units to measure in are beats per minute.
Controls:
- Take resting heart rate after 5 minutes sitting down without talking and moving as less as possible.
- The time measuring your heart rate before and after exercise. For the before exercise reading I will take it over 60 seconds so that I get a more accurate reading over a longer period of time. For the after exercise reading I will take it over 20 seconds so that I get an accurate reading before I begin to recover.
- Height of the step
- Exercise time- 60 seconds
- Type of exercise- stepping up on to the stool rung
- Position when taking heart rate- sitting down, no talking
- Take pulse immediately after exercise
Prediction.
Hypothesis: predict that if you increase the amount of exercise by two, your heart rate will increase by a factor of 1.3.
Reason: I have come to this conclusion after looking at the relationships between different amounts of exercise and the heart rate after them. Scientifically, the higher heart rate is due to the heart pumping faster to get more oxygenated blood to the muscles, which need it to work faster.
I will take secondary data from a classmate so that I can compare the two.
I will perform the step-ups twice and then also find the averages so that the over all results are more accurate.
OBTAINING EVIDENCE
Results:
This set of results was taken in school time:
The following results where all taken at home on 28/03/01 at 7:23pm. My resting pulse rates where: 62 59 60 61.
Here is a table of results of averages of the two sets of results:
Here is a set of my classmate Joanne Lerpiniere’s reults taken at school:
Here is second set of results taken at home on 03/04/01 at 5:00pm.her reting pulse rates were: 62 61 63 64.
Here is a table of averages:
ANALYSIS AND CONCLUSION
My first set of results do not really confirm my prediction.when I increased the amount of exercise by two the first time, the recovery time was quicker and quicker still when I increased it by two again. There apears to be no steady pattern in the results. An explanation for this could be due to the exercise which I did or did not do the lesson before. For the thirty steps per minute experiment there could have been calmer surroundings or for the ten steps per minute I could have been in a more energetic mood or provoked to laugh by one of my class mates. They also did not follow a regu;ar pattern because they where taken over a period of 14 days where the state of my health or the surrounding conditions could have changed.
My second set of results was done at home in much calmer suroundings and I also had no one to talk to me or distract me. Therfore these results are more accurate and to a certain extent, confirm my prediction.
The results in the table of averages do not show a regular pattern, but it does prove that the experiments for 30 and 40 steps per minute on the first table are not very accurate because on the first table after the amount of minutes which the pulse rate returns to normal it has not yet fully returned to normal on the average table.this is the same with Joanne’s results on 40 and 50 steps per minute.
Comparing Joanne’s and my results, you can see that over all I am a fitter person than Joanne. This could be because I play football every weekend and genrally a more active and energetic person than Joanne, which shows that exercise has a long term affect on your heart which makes it more efficient and used to copping with exercise. My average for the amount of minutes it takes for my pulse to return to normal rate is about 3.6 when Joanne’s is 5. The reults also reveal that both sets of results taken in school do not follow a regular patternwhich confirms that in school is not really the best place to carry out the experiment. But it does show how much our pulse rate can be affected by our health and surrounding over 14 days.
Any of the results could have also been afected by coughing, talking, laughing etc. or if something happened by supprise, such as a test tube falling and smashing on the ground near by. This is because our body would have sensed a sudden change in the enviroment and possible danger so the heart would start to beat faster to prepear the body for action.
My conclution is that an increase in exercise does increase the pulse rate but it veries person to person depend ing on how much regular exercise they do and how energetic and active they are as a person. They more exercise they have done the quiker the pulse should return to normal and the lower it should stay when doing exercise.surroundings also affect your pulse rate, the more distraction, the harder it is to follow a steady pattern.
EVALUATION
I think that I planed out my experiment quite well and I interpreted the information well to give an accurate conclution. The second set of my results was very helpful becauseit showed the calmer surroundings give more accurate results and also I was able to make a table of averages.
Comparing my results with Joanne’s also helped helped to show how pulse rate between two people with different life styles compare to each other. It also clarified why some of my results appeared to be very innacurate.