PREDICTIONS
- I predict that my heart rate will increase during exercise because my muscle being used will need a higher supply of oxygen, which is carried in the blood, therefore my heart should pump faster to deliver for the demand of oxygen.
- I predict that my maximum heart rate will be around 205 BPM, this is because to work out maximum heart rate you can roughly calculate 220, minus your age.
- I predict that I will only reach my maximum heart rate if I exercise intensively or after the one minute mark of exercising. This is because I am used to exercising and I think that my body needs the higher oxygen demand after I have got well into physical activity.
- I think that if I do an anaerobic exercise, I will reach my maximum heart rate much quicker because I will be in oxygen dept after a short burst of this intense type of exercise and my blood will be pumped quicker around my body to supply the muscles with the oxygen they have been starved of and to start the removal of lactic acid.
- I predict that my heart rate will stay constant after one minute of exercise and will return to normal within one or two minutes, when I check my pulse it will start to recover so when I exercise I will take it for 10 times it by 6.
APPARATUS: -
METHOD: -
- Collect equipment
- Check basal/ resting heart rate
- Perform the step-ups on a 24cm high step/stool for 30 seconds
- Then stop and check the heart rate for 10 seconds
- multiply this result by 6
- Time how long it takes to recover to basal heart rate after a rest of 30 seconds, 60 seconds 90 seconds and 120 seconds. Or until basal heart rate returns.
- perform this routine after 1 minute of step-ups, 90 seconds and 120 seconds.
- record these results In the data capture sheet.
SAFTEY AND FAIR TEST:-
To make sure we are not of risk from injury we should be warm before we start, it is essential to do a range of mobility exercises before the activity because depending on the intensity of movement, you can damage connective tissues and muscles. You must also wear the correct clothing for the activity i.e. trainers and freely movable clothes to prevent the chance of getting skin rashes and instability. Another safety check should be the surface that you perform the activity on because an uneven or debris littered surface can cause you to trip or sprain joints. The fair test elements to look at in my experiment is to try to perform the step-ups at the same rate, because different intensity of exercise can change the effect on heart rate as well, also the intensity can change the respiration stage you perform in so results can be skewed. We must also make sure the equipment is the same in each test i.e. using the same height of step and timing equipment and boundaries
RESULTS: -
*STARTING HEART RATE 66 BPM. When timed for 10 seconds multiplied by six, 69 BPM when timed for one minute.
My preliminary experiment was to see what the effect would be on the heart rate after jogging different distances but it was inconvenient at the time I was doing the experiment and I would not be able to keep the same pace for all the distances and recovery will be an issue, therefore the experiment would not of been very fair.
ANALYSIS: -
The results that I have gathered from my experiment I have put into graph form. From my results I have found out that the more I exercise the longer I exercise the longer it takes for my pulse to return to normal, I think that I did not reach my potential maximum heart rate because the exercised was not strenuous enough for my body. I also discovered that when taking my pulse it takes a few seconds for the strong pulse to get back to the surface. I found out that this is because the blood is feeding the muscles oxygen at first then the body wants to lose heat from the body created my movement as well so the blood vessels dilate.
The percentage increase for the 30 seconds of step ups was 63.6%, for sixty seconds of exercise it was a 72% increase and for 90 seconds it was a full 100% increase. For the 120 seconds of exercise it was a 127% increase. This means that the heart can double its basal heart rate during exercise and even has the ability to triple its output as well.
The heart rate also has slight irregularities because when I timed it for a whole minute it was different than timing it for ten seconds and multiplying it by six.
I think that my heart rate did not go above what it did because as I predicted, it will only do that when I respire anerobically or for a very long time, this is because my body did not need loads of oxygen or more than it can supply. My heart rate went back to normal after one minute after the first exercise as I predicted then it took longer to recover as the amount of exercise increased.
CONCLUSION/ EVALUATION: -
I have found out that when I exercise my heart rate increases, sometimes my heart went over twice its normal output, I also found out that step-ups don’t make me use the maximum heart rate. I think that my readings were quite accurate because of the way I measured them the time was easy to get an accurate reading on a chronograph stop watch and I did not have time to recover the way I took my pulse do had a reading of exercise pulse. However the way it could have been more accurate is to use an electocardiogram.
