Keys Fitness 900R - Manual (Page 9)

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To set the countdown function for Time,
Calories, or Distance:
Press the Mode key until the correct screen has been chosen.
Press the Set key until the desired reading appears in the window
you are setting.
If the countdown mode is set for the Time, Calories, or Distance
before your workout begins, then the console will alert you when
you have reached your goal with an audible beeping. To turn off
the alert, simply depress the Mode key. After the countdown
mode has reached your selected goal, it will then begin counting
upward. This will allow you to continue to track your workout if
you decide to keep exercising.
To set the high and low heart rate range:
Press the Mode key until the up or down arrow in the Pulse win-
dow has been chosen. Press the Set key until the desired reading
appears in the Pulse window.
NOTE
Without signal for a period of 4 minutes, the LCD display will
automatically shut off. All information will be stored and appear
again once activity is returned.
Turn on the monitor by pressing any button or by beginning exer-
cise.
Monitoring Your Heart Rate
To obtain the greatest cardiovascular benefits from your exercise
workout, it is important to work within your target heart rate
zone. The American Heart Association (AHA) defines this target
as 60%-75% percent of your maximum heart rate.
Your maximum heart rate may be roughly calculated by subtract-
ing your age from 220. Your maximum heart rate and aerobic
capacity naturally decreases as you age. This may vary from one
person to another, but use this number to find your approximate
effective target zone. For example, the maximum heart rate for an
average 40 year-old is 180 bpm. The target heart rate zone is
60%-75% of 180 or 108-135 bpm. See Fitness Safety on page 16.