Acumen Stopwatch - Manual (Page 47)

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Part II
Getting to know the three Target Zones (TZ)
In order to benefit the most from your workout, you need to become familiar
with your Heart Rate Target Zone. For most people, as your heart rate
exceeds the upper limit, your body begins to become anaerobic and produce
acids. By working within the correct range, you will achieve your fitness
goals and strengthen your cardiovascular system in less time.
Zone 1 (Fat Burning Zone, 55-65%) -This range is recommended for those
who haven't worked out in a long time, are trying to lose weight, are at a high
risk for heart problems or if you're just not feeling 100% one day.
Zone 2 (The Aerobic Zone, 65%-85%) - This range is recommended for
those in good physical condition who have been exercising on a consistent
basis for an extended period of time. Exercising at this range helps improve
your fitness level and prevent injury caused from overtraining.
Zone 3 (The Anaerobic Zone, 85% - 95%) This range is used only for those
in extremely good physical condition during races or training for competition.
It is typically used for interval training to help improve or measure endurance
levels.
Select Target Zone Before Exercise
Select a desired Target Zone before exercise. The watch will record the time
you are In, Below and Above this Zone, the Average Heart Rate, and will
give both visual & audible indications when you are out of the Zone during
exercise.