Hypothesis- Physical activity does increase a persons heart rate because they need more oxygen in the blood when they are active 

{X} Independent variable- Type of activity/exercise

{Y} Defendant variable- heart rate/bpm

Control- Heart rate while resting in place/ laying down

Experimental- Heart rate while exercising (going up and down the stairs) 

Factors held the same- heart rate being measured for the same amount of time, Amount of exercise, same body weight, Same resting time in between.

STEPS-

the two people went up and down the stairwell four times.And the heart beats are measured for 15 seconds and multiplied by four to get the heart beats per minute (bpm).

rest for 15 seconds and repeat two more times.

1. Go up and down the stairwell four times.

2. Count the heart rate in 15 seconds and multiply that number by 4 to get the heart beats per minute.

3. Rest for 15 seconds 

4. Repeat steps 1-3 two more times (There should be three columns of data.)

The hypothesis that physical activity increases heart rate is supported by the data because as you can see in the two charts that physical activity does in fact affect our heart rate compared to our resting heart rate.

As shown by the lab, the average resting heart rates were between 66 bpm and 69 bpm. The heart rates during the exercise however were between 155 and 194, nearly double that of the resting heart rate. This data seems to suggest that partaking in physical activity or exercise does increase your heart rate. 

RESEARCH-

Your heart rate speeds up and slows down to accommodate your body’s changing needs for oxygen. When you exercise, your heart rate speeds up in order to pump more oxygen-carrying blood to reach your muscles.

EXPERIMENTAL WEAKNESSES-