M
M
a
a
x
x
D
D
i
i
s
s
p
p
l
l
a
a
y
y
M
M
o
o
d
d
e
e
In the
MAX DISPLAY
mode, the digital numbers on the display show the highest reading of the
current session for that channel. Any time the value shown is exceeded, the new higher value will be
displayed. At any time the value can be reset by pressing one of the arrow keys for that channel. In
the
WORK/REST
mode the value is automatically reset at the beginning of each trial.
The bar display always shows the current level of EMG activity in addition to the most recent
maximum. The current level is indicated as the top of the moving bar display. The maximum is shown
by a small indicator at the previous maximum of the bar. When the digital display is reset (by pressing
one of the arrow keys for the channel) the maximum indicator is also reset to the end of the moving
bar.
The
MAX DISPLAY
mode can be used for either or both channels, and either channel may be set to
the
MAX DISPLAY
mode while the other channel is set to any of the other modes.
R
R
a
a
t
t
i
i
o
o
D
D
i
i
s
s
p
p
l
l
a
a
y
y
M
M
o
o
d
d
e
e
The
Ratio Display
mode shows the value of EMG A divided by EMG B on the bar display. The digital
numbers show the individual EMG A and EMG B values as well as the ratio. This mode generates a
very clear comparison of the activation of one muscle to another. It may be used in bilateral training,
comparing a muscle on the left side to the same one on the right. It also may be used to train
activation of one muscle while inhibiting an opposing or substituting muscle.
The ratio goal is an
ABOVE TONE
type of feedback, with a tone generated when the ratio goal is
exceeded. The center of the bar is the 1:1 ratio position, the top of the bar is 10:1, and the bottom is
0.1:1.
When the ratio mode is initially selected, the default ratio goal value is 1 to 1. If either of the A arrow
keys are pressed, the digital displays show the current ratio goal setting rather than the current EMG
ratio. To change the ratio goal value, simply continue to press the appropriate A arrow key until the
desired ratio goal is reached. Use single key presses to increment or decrement the ratio goal value,
or hold the key down for larger changes. Both the digital display and the position of the goal arrow
will change to reflect the current ratio goal value. When the desired ratio goal value is displayed, do
not press any keys. The MR-20 will return to the real-time display in a few seconds.
In the ratio mode pressing either of the B arrow keys temporarily halts the operation of the MR-20,
freezing the display. This allows the values at any point in time to be easily recorded. When the MR-
20 is halted, pressing either of the B arrow keys causes operation to resume.