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Maximum heart rate
Your target heart rate range become smaller/decreases.
To calculate a target heart rate for exercise, first determine the maximum heart rate by subtracting the person's age from 220. For instance, a twenty year olds maximum heart rate is 220 minus 20, or 200. The target heart rate for moderate intensity exercise is 50-70% of the maximum. This is calculated by multiplying 200 by 0.50 and by 0.70. This gives you a target heart rate range of 100-140.
Using the maximum heart rate formula, ( for apex)
An ideal range to aim for when exercising, calculated using the maximum heart rate formula
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finding your heart rate recovery time - apex:)
finding your heart rate recovery time
Use the Target Heart Rate Calculator on this website http://www.cardiogod.com/tachycardia.html
(220 + your age) ×.55 = beats per minute