This experiment tested how different amounts of caffeine can affect a person’s heart rate. It is shown that the higher amount of caffeine intake, the higher the heart rate will increase. To test this there was four drinks: water (Omg), Diet Coke (46mg), Mountain Dew (55mg), and Celsius (200mg). Using these drinks with different amounts of caffeine, we measured our heart rate, before consuming the drink, and after consuming the drink at three different time increments: 30 minutes after, an hour after, and two hours after.
With the results we got, we were shown that the higher the milligrams of caffeine in a drink, the higher the heart rate increases.
Introduction:
Hypothesis: The more milligrams of caffeine consumed, the higher the heart rate will be.
Physiology: “Once consumed, caffeine enters your blood from the stomach and small intestine and begins to stimulate your CNS. Caffeine stimulates receptors located in cells within your heart to increase your heart rate.”
Materials:
- Paper and Pencil
- Stopwatch
- 5+ participants
- 12 oz water (0mg of caffeine)
- 12 oz Diet Coke (46mg of caffeine)
- 12 oz Mountain Dew (55mg of caffeine)
- 12 oz Celsius (200mg of caffeine)
Discussion:
In the experiment, research showed that high milligrams of caffeine resulted in a high heart rate. The experiment conducted showed this to be true. Water, which had the lowest amount of caffeine at 0mg , had the least effect on heart rate. Whereas, Celsius with 200mg of caffeine had the highest increase on heart rate.
Errors that may affect the results, could be any medical conditions (ADHD, Diabetes, High or Low Blood Sugar, etc.) or the level of activity between pulse measurements. Besides these possible errors, the results show that caffeine increases heart rate.
Conclusion:
Our hypothesis supported that the more caffeine someone consumes, the higher the heart rate will increase.
Results:
| Beverages (mg of caffeine) | Heart Rate (Before) | Heart Rate (30 minutes after) | Heart Rate (1 hour after) | Heart Rate (2 hours after) |
| Water | 73±7 bpm | 76±7 bpm | 76±6 bpm | 72±10 bpm |
| Diet Coke (46mg) | 76±8 bpm | 81±9 bpm | 76±7 bpm | 79±7 bpm |
| Mountain Dew (55mg) | 76±7 bpm | 81±8 bpm | 81±7 bpm | 77±9 bpm |
| Celsius (200mg) | 74±7 bpm | 80±15 bpm | 83±13 bpm | 82±12 bpm |
Shanona
December 1, 2023 — 9:20 pm
This experiment was very clear and easy to follow. It’s alarming how long the heart rate stays increased when Celsius is consumed. That form of caffeine has become very popular lately. This experiment made me wonder what the long term affects are with the heart rate being increased for long periods? And is it healthy to be consumed everyday? Thanks for sharing!