II. Problem/Research question – Your heart rate can be affected and changed using a variety of things. One thing that can cause your heart rate to change is the volume of audio. How does the volume of an audio track affect your heart rate? If the volume of an audio track is increased, the number of hearts beats per minute will increase as well.
III. Variables –
❖ Independent Variable
➢ The volume of the audio track
❖ Dependent Variable
➢ Heart rate of participants measured in beats per minute (bpm) ❖ Controlled Variables
➢ Audio Track
➢ iFrogz headphones
➢ MacBook Laptop
➢ 15 seconds for calculating bpm
IV. Materials –
❖ Audiocheck-1.net_puretone_1000_80 sound file
❖ MacBook Laptop
❖ iFrogz headphones
❖ Writing utensil
V. Picture or diagram of lab setup –
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |Taking resting heart rate |Playing Volume Test |Take heart rate after volume test |
VI. Procedure –
1. Set up materials
a. Set timer for 15 seconds
b. Open iTunes on MacBook
i. Any laptop or media player can be used
c. Open correct audio file and prepare for it to play. d. Set-up data table
2. Take the first participants resting heart rate by finding pulse on wrist. Then, using the timer, count beats for 15 seconds. When timer is finished take the number of beats for 15 second and multiply it by 4. Doing this will give you number of beats per minute. 3. Record resting heart rate in data table
4. Have participants put on headphones, making sure that they but the correct ear bud in the correct ear. (Right bud in right ear, Left bud in left ear) 5. Set the volume to only 25% full
6. Press play
7. When audio track is finished take the participants heart rate, using the process in steps 2-3. 8. Have participant rest for about 1 to 2 minutes.
9. Repeat steps 4-8, but instead of 25% full increase the volume to 44%. 10. After testing 44% volume, increase volume to 63%, and then continue repeating steps 4-8 testing 81%, and 100% full. 11. Collect and process data.
VII. Raw data – The Effect of Volume on Heart Rate (Raw Data) | |Participant 1 |Participant 2 |Participant 3 |Participant 4 |Participant 5 | |Resting (bpm) |80 |100 |132 |128 |96 | |25% (bpm) |98 |88 |112 |144 |100 | |44% (bpm) |84 |88 |104 |124...