Concept explainers
To find: the interval in which the person’s heart is form 50% to 85% of the maximum heart rate.
Answer to Problem 90E
The required interval
Explanation of Solution
Given information:
Given
A 40 year old
Calculation:
The maximum heart rate in beats per minute is given by
The sedentary person should strive to increase his or her heart rate to at least 50% of the maximum heart rate. This means that the least increase in the maximum heart rate is 50% of the maximum heart rate, that is
Now, a healthy person should strive to increase his heart rate to at most 85% of the maximum heart rate. This means that the maximum increase in the maximum heart rate is at most 85% of the maximum heart rate, that is
Combining the previous two equations, we get
For a 20 year old, the maximum heart rate is given by the equation
Here
Therefore,
For expressing the interval range of the target heart rate for a 40 year ols,
We put the value of
This is the required interval.
Chapter A Solutions
EBK PRECALCULUS W/LIMITS
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