Question

health opportunities through physical education
b. estimated resting heart rate
you can perform an estimated resting heart rate by lying quietly for 5 to 10 minutes. do not talk,
and match the time of your inhalations with your exhalations (breathe in 3-5 seconds, breathe
out 3-5 seconds). take your radial pulse count after 5 minutes. compare this to your \true\
resting heart rate.

date

15-second radial pulse count

resting heart rate (beats per minute)

------

------------------------------

----------------------------------------

2/5

18

72

2/5

23

92

3. now that you have your estimated maximal heart rate (max hr) and your estimated resting

heart rate (rhr), you can calculate your heart rate range (hrr; also called heart rate reserve) by
using the following calculation:
heart rate range (hrr) = maximal heart rate (max hr) - resting heart rate (rhr)

1. in the next class you will use your max hr, heart rate reserve (hrr), and resting heart rate (rhr)

to determine your heart rate target zone for building your cardiorespiratory fitness.

Explanation:

Step1: Define standard max HR

Max HR is typically $220 - age$, but since age is not given, we use the standard default for demonstration: $\text{max HR} = 220$ (for a 0-year-old, or we can note if we use average adult RHR, but first, calculate RHR from the table)

Step2: Calculate RHR from 15s pulse

For 2/5: $\text{RHR} = 18 \times 4 = 72$ bpm
For 2/5 (second entry): $\text{RHR} = 23 \times 4 = 92$ bpm

Step3: Calculate HRR for first entry

$\text{HRR} = 220 - 72 = 148$

Step4: Calculate HRR for second entry

$\text{HRR} = 220 - 92 = 128$
*Note: If using a realistic adult age (e.g., 16 years old: $\text{max HR}=220-16=204$):
For first entry: $\text{HRR}=204-72=132$
For second entry: $\text{HRR}=204-92=112$*

Answer:

If using the standard default max HR of 220:

• For the 2/5 entry with 15-second pulse 18: $\text{HRR}=148$ beats per minute
• For the 2/5 entry with 15-second pulse 23: $\text{HRR}=128$ beats per minute

If using a common student age (16, max HR=204):

• For the 2/5 entry with 15-second pulse 18: $\text{HRR}=132$ beats per minute
• For the 2/5 entry with 15-second pulse 23: $\text{HRR}=112$ beats per minute