Acumen Stopwatch - Manual (Page 82)

78
Part III
The calculated exercise range for a 30 year old would be a low of 121 and a high of 158 beats per
minute. (You should never exercise near your maximum heart rate (max HR) for any period of time.)
TARGET ZONE CALCULATION FORMULA
207 - Your age x 0.7 = max HR
For a 30 year old person, your
calculations would be as follows:
207 - 30 X 0.7 = 186 Maximum Heart Rate
65% of this number = 121
85% of this number = 158
Depending on your specific goals, individual fitness level or just on how
energetic you feel, you may want to modify your range from one day to the
next based on the following chart:
Basic Fitness Tips & Target Zone
or Less