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Effect of Exercise on a Heart Rate.

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Effect of Exercise on a Heart Rate The Science Oxygen + Glucose = Carbon Dioxide + Energy (ATP) When you exercise, you increase the need of energy for your body. This Energy, or Adenosine Tri-Phosphate (ATP), is produced from oxygen and glucose. To get more oxygen into our body, we breathe faster, bringing more oxygen in to our lungs, and our heart rate increases, pumping this oxygen to our cells faster. The oxygen breaks down the glucose in the cells then produces the energy needed to continue your exercise. This is called aerobic respiration, meaning it uses oxygen. If you need more energy, then the body uses a process called anaerobic respiration, which means not requiring oxygen. An enzyme in your cells breaks down the glucose into two molecules of pyruvic acid. This gives off your energy, but the pyruvic acid is broken down further into lactic acid (carbon dioxide and ethanol). Because lactic is poisonous you can only release energy like this for a short time, because it would soon begin killing off your cells. The lactic acid builds up in your muscles making them ache. To recover from the poison in your muscles you breathe deeply, this provides oxygen, which breaks down the lactic acid, into carbon dioxide and water. The amount of oxygen needed for the muscles to recover is called the oxygen debt. ...read more.


I will repeat this process until I have pulse results up to seven minutes, this means exercising for four more times. To keep the test fair I will ensure my pulse is at its resting rate before starting any exercise. I will use the metronome to keep my steps in time and therefore not changing the rate of energy I exert. The only variable factor in the experiment will be the amount of time I exercise. To make sure the experiment is safe I will use the bottom stair; this will reduce the damage causes if I fall compared to using the top stair. To reduce the chance I will fall I will tie my shoelaces or wear socks. If at any time during the experiments I feel unwell I will cease the experiment immediately. Other factors we could investigate include the rate of our breathing after different lengths of exercise. The reason we chose to investigate our heart rate was because it is easier to record and provides a more interesting result. Equipment Stopwatch, Metronome, Table of results, Block or Stair Results Table of results Amount of exercise (minutes) Pulse rate after exercise (bpm) 0 (resting) 104 102 104 Average - 103 1 140 130 138 Average - 132 2 143 3 170 4 174 5 160 6 157 7 161 I repeated the measurements for resting and one minute three times and then took an average to get he most reliable result. ...read more.


They level that my heart rate started settling was at 160 bpm. A fit athlete would have a much higher level because their heart would cope with it easier and would therefore pump more oxygen around their body allowing them to keep going that much longer. Evaluation The experiment went well but did encounter a few problems. The first of which was the absence of a stopwatch, but watching the second hand of a clock and simply counting the minutes easily resolved this. Another change I made to my experiment was not to use a basic metronome, but in stead a drum beat from a keyboard, this proved just as good as method of keeping in time. I expect my results to be fairly accurate, my first result, when viewed on my difference's graph seemed more similar to the second than as I expected. This may have been because I made a mistake when recording my pulse rate or simply because my heart rate stays similar during the first and second minute of exercise. If I was to repeat this experiment I would make sure I had a hand held stopwatch or alarm, which would make it easier to check my time, than using the second hand of a clock. I could have worked with a friend, rather than doing it all on my own. This would have made it easier to concentrate on the exercise rather than worrying about how much longer I had to cary on for. Sources http://biology-online.org/1/2_ATP.htm http://biology-online.org/1/3_respiration.htm Jamie Willis ...read more.

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