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An experiment to determine the effect of caffeine on heart rate

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´╗┐Rimsha Arif IB1-5 An Experiment to Determine the Effect of Caffeine on Heart Rate RESEARCH QUESTION:- Does the effect of an increasing volume of caffeine in an energy drink cause a corresponding increase in heart rate? HYPOTHESIS:- The heart rate should increase proportionately to the amount of caffeine present in the different amounts of the energy drink that is used. Caffeine is known to cause tachycardia, which is a disorder of the heart rate (pulse) because it beats too fast. VARIABLES:- Variable Measured Method of measuring/controlling variable Independent variable The volume of caffeine in the energy drink 25ml, 50ml, 75ml, 100ml and 125ml of Bison (energy drink) will be used for each experiment. The volume is measured using a measuring cylinder. Dependent variable The number of heart beats per minute of the person This will be counted by a friend/family member by starting the stopwatch and counting the number of beats in a minute. Controlled variables The person taking the heart beat of the person doing the experiment The same person will be used so that the experiment stays accurate. ...read more.


Continue doing so until all volume samples have been drunk. Repeat steps 1-6 five times over a course of five days. A total of 5-6 hours on each day will be dedicated towards this experiment. The data can be used to calculate an average, which makes the experiment more accurate. ________________ DATA COLLECTION AND PROCESSING:- Raw Data ? A table to show the heart rate after drinking a certain volume of an energy drink with a certain amount of caffeine. Amount of energy drink (ml) Amount of caffeine (mg) Trial 1 - Heart rate (+/- 1.0 beats/minute) Trial 2 - Heart rate (+/- 1.0 beats/minute) Trial 3 - Heart rate (+/- 1.0 beats/minute) Trial 4 - Heart rate (+/- 1.0 beats/minute) Trial 5 - Heart rate (+/- 1.0 beats/minute) 0 0 69 68 74 67 71 25 6 73 74 78 69 75 50 12 76 72 81 74 79 75 18 82 85 86 78 83 100 24 87 86 89 84 88 125 30 90 89 91 87 92 Processed Data ? Amount of caffeine (mg) ...read more.


The heart rate wasn?t exactly based on the amount of caffeine present in my body. For example, I found myself doing other activities that increased my heart rate, such as lifting heavy objects and going up and down the stairs. In some cases, I did this a few minutes before it was time to measure my heart rate, therefore getting an inaccurate set of results. This could have been avoided if I sat down in one place for an hour, making sure that my heart rate was only affected by the caffeine. In order to get more reliable results, larger amounts of caffeine should have been used, therefore more energy drinks should have been drunk. This would give a larger variety of data, which would make it more interesting to interpret and conclude. For example, a total of 100mg of caffeine should have been used, which meant that a total of about 4600ml of energy drink would need to be drunk. This may not have been possible as drinking that much energy drink isn?t exactly good for a person?s health, but it would be interesting to see what the results would be. ...read more.

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