Cybex 770T Treadmill - Manual (Page 83)

Cybex Owner’s Manual
83
Heart Rate Control
Note: This workout requires the user to wear a Polar or compatible Heart Rate transmitter belt. The
Heart Rate Control Workout (HRCP) cannot be selected on the control console unless the treadmill
detects a Heart Rate signal. The HRCP will not work with the cardio touch contact Heart Rate system.
After selecting the HRCP, the treadmill will prompt you for workout time, weight, age, and target Heart
Rate. Your age is required to estimate the proper range of Heart Rates. The target Heart Rate is
calculated by the formula 220 minus your age times 75%. You will then have the option of adjusting
the suggested target Heart Rate selected either up or down. Select a target Heart Rate which will
allow you to exercise comfortably and safely while at the same time allowing you to reach your
training goals. If you are unsure of what to select as your target, consult your physician or a physical
training professional, After starting the HRCP, the treadmill will attempt raise your Heart Rate to your
target within 3 to 5 minutes. The treadmill will emphasize using elevation of the treadmill deck first to
achieve higher workloads and thus higher Heart Rates; this is done to maximize the use of a walking
gait, which is safer and more comfortable for many users. As a result, many users will spend nearly
the entire workout at elevation up to 12% grade. After reaching your target, the treadmill will attempt
to keep you there within 5 beats per min. As you tire, the treadmill will compensate by reducing
elevation, speed or both. A two-minute cool-down is built in at the end of the workout.
Method of HRCP:
User selects Heart Rate target in the initial start of workout or accepts the suggested target of 75%
of 220 minus age. This target Heart Rate is extremely important for more reasons than just the
establishment of the target itself. It also makes an assumption of the general fitness level and controls
several aspects of how quickly the elevation and speed will be adjusted. As an example, the starting
speed for a selected target of 120 bpm (beats per minute) will be 2 mph. The starting speed for a
selected target of 140 bpm will be 3.5 mph. In between those selected targets the starting speed will
be proportional to the difference between 2 to 3.5. The integral gain constants will also be modified
depending on what the selected target is at the start of the workout. This means someone with a
higher selected target will get faster changes in speed and grade than someone with a lower target.
This has the effect of getting the more fit user to their selected target faster without overshooting the
target for someone with a lower fitness level. After the starting speed is attained by the treadmill, it will
then increase the elevation every 15 seconds up to 12% grade or until the computer senses that the
user is getting close to approaching their target Heart Rate. Since the control is somewhat predictive
in nature, it will leave ample room for the user’s Heart Rate to catch up to the increasing load. If the
target Heart Rate is not attained at the load level of the start speed at 12% grade, then the treadmill
will start increasing speed every 15 seconds up to 4 mph or until the computer senses that the user
is getting close to approaching their target Heart Rate. If the user is still not at the target, the treadmill
will increase speed to 5 mph and drop the elevation down to 8% grade. This is done because the
speeds between 4 and 5 are difficult for the user because it is too slow to jog and too fast for many
to walk. The drop in elevation compensates somewhat for the larger increase in speed. The system
will then increase the speed of the belt every 15 seconds up to the maximum speed of the treadmill or
until the computer senses that the user is getting close to approaching their target Heart Rate. At any
time if the users Heart Rate exceeds the target, the load will be decreased in the same order it was
increased to ensure that the rate is stabilized at or below the target. When the time period is reached
that is two minutes before the selected total time of the workout, the system will go into the cool
down mode. This cool down will be similar to the cool down protocols in all the other workouts on the
treadmill.