Cybex Owner’s Manual
75
9 - Heartrate Control (E3 View Monitor Option)
The Heartrate Control (HRC) program 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 program. A Cool Down is built in to
the end of the program. HRC is run in Constant Power and thus denes watts.
The user selects a target heartrate, which defaults to 75% of max (max is 220-age). Limits should be
set to not allow a Target HR (THR) less than 60% of max or more than 95% of max.
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 and incline load of the 750T Treadmill HRC Program. 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 full control over incline throughout the program, with incline having no bearing on
the program at all. 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 program in progress, making the change to
their target heartrate real-time.
Lost Signal
If a signal is lost for two consecutive decisions (roughly 30 seconds), the display will beep four times,
show ‘HR SIGNAL LOST’, show dashes in the BPM window and show the heart solid white. During
this HR signal lost period, the load will remain steady.
If after two further decisions (roughly an additional 30 seconds) the heartrate signal has not been
reestablished, continue to show ‘HR SIGNAL LOST’ on the Text area. The program will reduce the
workload by 10 steps per minute until minimum workload or Step 1. After one minute at minimum
workload, go to Exiting Active Mode.
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