Prediction
I predict the harder that you exercises, the higher the heart rate would be. The blood has to be pumped round the body quicker by the heart. There are several reasons why this happens. Before and during the early stages of exercise the sympathetic nervous system is alerted and adrenaline is secreted in to the bloodstream. Triggered by impulses from the brain before exercise, the heart beats faster and general constriction of the arterioles except for those serving vital organs so that the blood under high pressure is diverted to the active muscles.
The metabolic rate increases. This is caused by the shortage of ATP. The increased metabolic rate results in carbon dioxide building up in muscle tissue. If the level of carbon dioxide builds up then this is monitored by chemoreceptors. This makes adjustments in the ventilation rate because you need more oxygen to replace the carbon dioxide. The heart rate increases to carry the waste away and replace it with oxygen quicker. Rapid movement of limbs stimulates receptors in the skeletal muscles and tendons. These transmit impulses to the heart, leading to a further increase in the heart rate.
Fair Test
I will make it a fair test by using the same machine throughout the whole experiment. I will also be doing the same type of motion and I will get equal rests in between each intensity period. I will try and do the experiment in the same temperature because if did I one of the experiments in a hotter climate the heart rate would be quicker and that would be unfair.
Preliminary Results to find out the Resting Time
These preliminary results were taken to show the resting time, which will be used throughout the experiment. As you can see from this table, the time after the exercise that took to get back to it’s original Resting time was180 seconds. Now I have found out that it only takes 180 seconds to get my heart back to it’s original pace after doing exercise for about 1 minute.
Results Table
Conclusion
There is a genuine pattern in my results, as my graph shows a clear and clean curve through the points. However there is only one anomaly in my graph, which tends to be at the end of the results.
My prediction I made earlier was correct, that the harder that you exercises, the higher the heart rate would be. The blood has to be pumped round the body quicker by the heart. There are several reasons why this happens. Before and during the early stages of exercise the sympathetic nervous system is alerted and adrenaline is secreted in to the bloodstream. Triggered by impulses from the brain before exercise, the heart beats faster and general constriction of the arterioles except for those serving vital organs so that the blood under high pressure is diverted to the active muscles.
The metabolic rate increases. This is caused by the shortage of ATP. The increased metabolic rate results in carbon dioxide building up in muscle tissue. If the level of carbon dioxide builds up then this is monitored by chemoreceptors. This makes adjustments in the ventilation rate because you need more oxygen to replace the carbon dioxide. The heart rate increases to carry the waste away and replace it with oxygen quicker. Rapid movement of limbs stimulates receptors in the skeletal muscles and tendons. These transmit impulses to the heart, leading to a further increase in the heart rate.
The reason this happens is because when you start moving at a faster pace the body uses up more oxygen, so therefore the body needs to provide more oxygen to replace it with the increasing carbon dioxide building up in the muscles. The more faster you exercise, the it makes them crave for more oxygen, which makes the heart beat faster to get the oxygen to the muscles where it is needed.
Evaluation
The evidence that I have collected during this experiment is enough to enable a firm conclusion to be drawn. That conclusion is the harder the exercise you do the faster the heartbeats. There were some factors beyond my control that could have affected my results. I did my first run through of the experiment (Preliminary) and the repeat experiment. The subject's fitness could have changed over the period between the first run through and the repeat experiment. The best thing was that I used a heartbeat monitor to accurately measure the heartbeat. To improve my investigation I could have done more tests compare the difference. I could also take a skin temperature reading, which could tell me if I get hotter or colder by doing the exercise.
When I was doing the breathing rate experiments, I was doing the experiment to see how fit I am. I did this by timing how long it takes for my breathing rate to get back to the normal rate (the rate it was at before they started to do the exercise). The experiment was to find the ‘effect’.
If I had more time I would of also take an average by repeating the test at least 3 times more. This would help me because one result may come out with odd results and this would be a way of making that result less affective. It would also ensure they were much more accurate.
To extend the investigation I could do another experiment using people and their lifestyles. I could then compare these results with the ones I had obtained in the previous test to see how peoples lifestyles affects their breathing rate.
