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Dyaco Canada Inc. 2015
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Symmetry
The Symmetry program may aid in achieving a more balanced pedaling stroke for patients with
lower limb deficiencies, such as stroke patients and post-op knee patients. The program will
measure the left and right power around the pedal rotation and display the watt measurements
in the message window. The Dot Matrix display will show a graph indicating the leg power
symmetry so the user has a visual feedback to aid in improving the involved limb’s strength.
1. Press the Symmetry key then press the
Enter
key.
2. The message window will prompt you to enter the
Time
for the program. You may enter
the time using the Up and Down keys or the numeric key pad then press the Enter key to
accept and proceed to the next screen.
3. You may turn the
Auto-brake
on or off then press enter to continue. Since the
auto-brake may be activated with severe asymmetry the auto-brake default setting is off.
If you want the auto-brake feature operational please set to on and press enter.
4. Now you are finished editing the settings and can begin by pressing the Start key. You
can also go back and modify your settings by pressing the Enter key.
For Best Results:
The Symmetry program starts at level 1 and the resistance needs to be increased manually by
pressing the Up arrow. Make sure to set the resistance to a level where the patient is doing
enough work to generate a meaningful measurement. It is recommended to set the resistance as
high as the patient can perform without discomfort, but low enough so they can complete full pedal
revolutions. Very low resistance settings result in erratic or inconsistent measurements.
Biofeedback Measurements and Graph:
Below is a sample picture showing the symmetry graph. In the message window there is an
average watt measurement and it is indicating that the left leg is producing more power than the
right leg, 41 vs. 34 watts. The graph reflects the higher wattage of the left leg. If the power is equal
in both legs only two dots would be lit on the bottom center of the graphic screen.
To view the Symmetry Index number press the Display key located under the message window.
The Symmetry Index number is the percentage of difference between the left and right leg power.
If the left and right legs are producing the same power the Symmetry Index will be 0%.
Note: The Symmetry program employs a proprietary algorithm using a power table and velocity
calculations to generate the watt readings; they are not from direct force measurements.
