Athletics: Cardiovascular Zone Your maximum heart rate (in beats per minute) may be estimated as 220 minus your age. For maximum cardiovascular effect, many trainers recommend raising your heart rate to between 50% and 70% of this maximum rate (called the cardio zone).
a. Write a linear function to represent this upper limit as a function of x, your age. Then write a similar linear function to represent the lower limit. Use decimals instead of percents.
b. Use your functions to find the upper and lower cardio limits for a 20-year-old person. Find the cardio limits for a 60-year-old person.
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