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Cybex Owner’s Manual
Cardio - Heartrate Control
This workout requires a Polar® compatible heart rate transmitter belt (not included).
The Heartrate Control (HRC) workout will attempt to bring the user to their target heartrate in 3-5
minutes, then keep them there for the duration of the body of the workout. A Cool Down is built in to
the end of the workout. HRC is run in Constant Power and thus denes watts.
The user selects a target heartrate, which defaults to 75% of max. Limits should be set to not allow a
Target HR (THR) less than 60% of max or more than 94% of max.
Max HR formula: 208-(0.7 x Age).
The protocol starts in Stage II, with the entry point based on Target HR.
• 80 – 120 BPM = Step 6
• 121-127 BPM = Step 8
• 128-134 BPM = Step 10
• 135-up BPM = Step 12
A running pulse-to-pulse BPM value is continuously measured.
Every 15 seconds the user’s pulse rate is sampled and a prediction function is evaluated (decision.)
This is subtracted from the target heartrate to form an error value which is scaled and added to the
current load value. There is a maximum rate of change of 15 steps per decision.
The workload equates to the speed of the workout. A chart of Step and Watts has been created. It has
four dened stages:
• Stage 1 ramps the load from Step 1 to Step 5.
• Stage 2 ramps the load from Step 6 through Step 18.
• Stage 3 ramps the load from Step 19 through Step 39.
• Stage 4 ramps the load from Step 40 through Step 100.
The user has limited control over the load in that the user’s selections are not permanent. At the
next decision, a new load can be chosen by the software as described above to override any user
modications.
If the user presses the LEVEL key, they can modify their Target Heartrate real-time. Utilize the Target
Heartrate Setup selection screen and exit back to the workout in progress, making the change to their
target heartrate real-time.
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