Question

create a chart like the one below. then, complete the following steps.

1. find your pulse. count the number of times your heart beats in 60 seconds.
2. record and repeat two more times. its important to have more than one trial in an experiment to reduce errors.
3. calculate the average of the three trials, and record the results. the average can be calculated by adding the three trial values together and then dividing by three.
4. hold your breath for 30 seconds, and take your pulse immediately afterward.
5. record and repeat two more times.
6. calculate the average of the three trials and record.

	trial 1	trial 2	trial 3	average
heart rate after holding your breath (beats per minute)

comparing your results
use the following information to compare your results to the average results.

• resting heart rate (beats per minute)
• average: at rest, an adults heart beats an average of 72 times a minute. keep in mind that heart rate depends on age, size, activity, and so on.
• heart rate after holding your breath (beats per minute)
• average: most likely, your heart rate slowed down (less than 72 beats per minute) due to the decrease in oxygen.

Explanation:

Step1: Measure resting heart - rate

Count heart - beats in 60 seconds for 3 trials.

Step2: Calculate resting heart - rate average

Let the three trial values be $x_1$, $x_2$, $x_3$. The average $\bar{x}=\frac{x_1 + x_2+x_3}{3}$.

Step3: Measure heart - rate after breath - holding

Hold breath for 30 seconds and count heart - beats immediately afterward for 3 trials.

Step4: Calculate heart - rate average after breath - holding

Let the three trial values be $y_1$, $y_2$, $y_3$. The average $\bar{y}=\frac{y_1 + y_2 + y_3}{3}$.

Answer:

You need to actually perform the experiments (measure the heart - rates for each trial and calculate the averages) to fill in the chart. The resting heart - rate average should be compared to 72 beats per minute and the heart - rate average after breath - holding should likely be less than 72 beats per minute.