A presentation displaying the data collected after experimenting to try and establish a relationship between heart rate and caffeine. Caffeine seemed to raise the heart rate of a subject when at rest and exercising.


This experiment was conducted to test…

The effects exercise has on heart rate

the effects caffeine has on a resting heart rate

the effects caffeine has on an active heart rate

Methods and Materials:

Materials used:

  • Apple Watch or Fitbit
  • 8oz water
  • Kiwi Guava Celsius packet (200mg of caffeine) Electronic used to record/graph


Our participants used an Apple watch or Fitbit to record their resting, heart rate. Then they completed a physical activity for one minute and recorded their active heart rate. After recording both heart rates, the participant would drink the mixed beverage of one Celsius packet and eight ounces of water, then wait twenty minutes.

After twenty minutes, the participant would take their resting and active heart rate again.


Figure 1 indicates that during both rest and exercise, the mean heart rate increased after caffeine consumption, but all groups had a large standard deviation. The mean resting heart rate without caffeine was

71 ± 8.93 bpm. After consuming 200mg of caffeine and waiting for 20 minutes, the mean resting heart rate increased to 80.74 ± 10.18 bpm.

The mean heart rate during exercise before caffeine consumption was

142 ± 23.85 bpm. The mean heart rate during exercise after caffeine consumption was 151 ± 21.59 bpm.


Exercise: Jumping Jacks, Run

Intensity: Moderate

Duration: One Minute

Dose: Kiwi Guava Celsius packet (200mg of caffeine) We had individuals do a light to moderate exercise regimen consisting of jumping jacks or a moderate run. The exercise was for one minute before and after consuming a kiwi guava Celsius packet that had 200 mg of caffeine. Our graphed data supported our hypothesis and showed that caffeine does indeed have an impact on heart rate. The average resting heart rate before consumption of caffeine and without exercise was at 71bpm. After the individuals exercised for one minute without caffeine, their heart rate jumped to 142bpm. When individuals consumed the caffeine, their resting heart rate before exercise was at 80bpm.

After taking the caffeine and exercising, the heart rate jumped to 151bpm. We can see an observable increase in heart rate in resting before caffeine and exercise before and after the consumption of caffeine.


After conducting the experiment, the hypothesis that caffeine would in fact raise heart rate and be supported by the data gathered from the participants. Caffeine increases resting and active heart rates after being consumed, and by a significant increase as well.

Media Description: Poster about the effect of caffeine on heart rate

Instructor: Kabeer Sahib

Item Credit: Brianna Posey, Alana Chapman, Leonce Ndayisaba, Tara Morse