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Does Caffeine affect Heart Rate?

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Does Caffeine affect Heart Rate? Summary In this experiment I investigated if caffeine affect heart rate. I took 4 different concentration on caffeine and gave me to daphnia (water flea). I measured the heart rate of theses water flea and found out that caffeine does affect heart rate in daphnia and also the higher the concentration of caffeine the greater the increase in heart rate. Introduction Hypothesis: The more caffeine add to the Daphnia the quicker the heart rate will be. Caffeine is a natural product produce in leafs and seeds of plants as an insecticide. Caffeine is medically know as trimethylzanthine and in pure form is a white crystalline powder. However the main way to consume caffeine is through drinks such as coffee and tea which are see as "pick me up" drinks and also cola, all have caffeine in them. Caffeine is also used in medicines in aspirin preparations and is also found in weight-loss drugs and also other drinks to keep you a wake such a red bull or pro-plus. Caffeine acts as a stimulant drug. ...read more.


The recommend daily alconce by doctors is 100mg of caffeine but as you can see you could quite easy go over that limit by just have a 5 ounces of coffee. Method Equipment list * Culture of Daphnia (water fleas) * Cavity slides * Dropping pipettes * Distilled water * Caffeine tablets * Cotton wool * Standard glassware ( breaker, measuring cylinders, etc) * Stopwatch * Paper towels or filter paper * Microscope Procedure 1. Gather all equipment on list 2. Make a standard solution of 50 ml of 0.1% of caffeine. 3. Mix 8ml of caffeine solution with 2 ml of distilled water in a beaker (label 0.08%) 4. Mix 6ml of caffeine solution with 4 ml of distilled water in a beaker (label 0.06%) 5. Mix 4 ml of caffeine solution with 6 ml of distilled water in a beaker (label 0.04%) 6. Mix 2 ml of caffeine solution with 8 ml of distilled water in a beaker (label 0.02%) ...read more.


This results therefore show that if a human would consume caffeine then there heart rate would increase. The results support my hypothesis that caffeine does increase heart rate. My conclusion is that caffeine does increase heart rate and this is shown from my data I have collected. However if only small amounts of caffeine are comsumed there will not be an advivest effect on the body or a persons health. Doctors recommend that no more than 100mg of caffeine should be consumed daily. This is so that the concentration of the drug is not to high in the body to have a dangerous affect and this is also shown in my data. This is shown because as the concentration increase so does heart rate. Therefore the increase concentration of the drug in the body could increase other side effects. I believe that my results are reliable and can be used as valid data. This is due to the fact I keep to my plan and control the indenptent variables well. The temperature was kept at room temperature. Also light was keep at the same level and the heart rate were measure under a controlled situations. ?? ?? ?? ?? ...read more.

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3 star(s)

This is a well researched report that covers the required aspects.
1. The background knowledge needs to be referenced.
2. The procedure is well detailed.
3. The results table is well presented.
4. The conclusion is well justified.
5. The report is missing an evaluation.

Marked by teacher Luke Smithen 05/07/2013

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