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To investigate the factors affecting your pulse after consuming caffeine.

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SC1 Aim: To investigate the factors affecting your pulse after consuming caffeine. Prediction: In my science experiment/project I predict that the more caffeine that is consumed, the higher the pulse rate will be. I think this because at a low intake (less than 100mg caffeine in one drink) the effects will be minimal, but higher intakes (greater than 200mg) can produce changes in heart rate and blood pressure. This leads me to think that the more caffeine consumed results in a higher pulse rate. Coke drinks contain about 35 mg caffeine per standard 280 ml serving, with some 5% of the caffeine being a component of kola nuts and most of the remainder being added in the form of a by-product of the decaffeination of coffee and tea In the heart, this response prompts norepinephrine--also called noradrenalin--and a related neurotransmitter, epinephrine, to increase the rate and force of the muscle's contractions. Although the two act in concert, norepinephrine is released by sympathetic nerves near the pacemaker tissue of the heart, whereas epinephrine is released primarily by the adrenal glands. ...read more.


I propose to do each of the tests at least three time and take an average. I will record the results of my pulse and then plot a graph. THINGS I NEED TO DO TO MAKE IT A FAIR TEST: 1.) Measure the amounts of coke accurately by using a measuring cylinder of an appropriate size. 2.) Measure the amount of hot water I will consume for the coffee 3.) Always wait for my pulse to go back to resting before starting the next test. 4.) Using the type of coffee and coke all the time. 5.) Use an electronic pulse meter to give me more accurate results than counting the heart beat yourself APPARATUS: 2 litre bottle of coke which contains caffeine, Accurate measuring cylinders (appropriate size), 1 stop clock, Paper and pencil to record down the results. SAFETY: 1.)Make sure that the measuring cylinders and the cups are completely sterile, to make sure that you don't get ill. 2.) No running around the science lab, because you could trip and hurt yourself. ...read more.


For example to get a better result I would have done the experiments another three times to get a much better average if I had had the time. On the graph there was an anomalous result for 150cm3 as shown. This may have been an error in my counting of my pulse, or there may have been slightly too much coke that experiment. To have made the measurements even more accurate I could have used a burette because it would have given a much more precise measurement. To improve the accuracy of pulse rate a medical heart rate monitor would have been more accurate. Because of the constraints of time it was not possible to take all the readings in the same lesson period. The smaller quantities were taken during a lesson after morning break (during which I had eaten), which the larger volumes were consumed during a lesson before lunch when my stomach was empty. The varying presence of food in my stomach could alter the absorption of the caffeine into the blood stream. Taking all these factors into account the results obtained gave a satisfactory correlation between pulse rate and amount of caffeine consumed. ...read more.

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