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The Quadriceps bench can be used for therapy to
improve strength, mobility, endurance or coordina-
tion. We direct you to the therapy guides and refer-
ence books published on this matter. Also the EN-
Xplore therapy guide from Enraf-Nonius can be of
assistance.
For the use of the Quadriceps bench please take
note of the following instructions:
1. Patient positioning
2. Adjustments of the Quadriceps bench to the
morphology/anatomy of the patient
3. Setting of the exercise resistance
4. Setting the range of motion (ROM)
1. Patient positioning
1.1. Adjust the chair for a sitting or lying position.
1.2. Be assured that all fixation knobs are tightly
fixed.
1.3. Let the patient take place in the required initial
position. In table 1 some suggestions of initial
positions for the different muscle groups are
given.
2. Adjustments of the Quadriceps bench
to the morphology/anatomy of the
patient
2.1. Adjust the back section to the patient (during
exercising a proper positioning with sufficient
lumbar support is essential).
2.2. Adjust the rotation axis of the Quadriceps bench
to the anatomical axis of the joint that is to be
exercised. In table 1 some suggestions are given
for joint axis estimation. In case the joint axis
and the rotation axis of the machine are not
well aligned, a frictioning movement between
the resistance pad and the leg will occur.
2.3. Fix other body parts with velcro when desired
(velcro is not standard supplied with the Quad-
riceps bench).
3. Setting of the exercise resistance
The exercise resistance is depending on:
•
The amount of weight;
•
The length of the lever arm;
•
The trajectory of the movement of the lever arm;
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HANDLING AND USE
3.1. The amount of weight
The amount of weight can be adjusted by place-
ment of the weight-discs that are supplied with
the Quadriceps bench as shown in fig 1. The
Quadriceps bench is supplied with 10 discs of
0,5 kg (~ 5 N) and 1 disc of 5 kg (~ 50 N). Be
sure all fixation knobs are well tightened.
3.2. The length of the lever arm
The torque (rotary force) around the axis can
be influenced by varying the lever arm. An in-
crease of the lever arm with an unchanged weight
will result in a larger torque around the axis
(M = F x d, where M is the torque around an
axis, F is the force of the weight and d is the
distance between the force and the axis).
The further the weights are allocated with re-
spect to the axis, the bigger the resistance.
The scale at the lever arm indicates the dis-
tance between the weight-discs and the axis of
rotation. Note that the tubes on which the discs
are mounted are allocated at 5 cm of the top
of the fixation shaft (see fig 2).
3.3. the trajectory of the movement of the lever arm
The settings of the trajectory of the lever arm
determine where exactly in the range of motion
(ROM) a certain resistance is given. The maxi-
mal resistance is produced at that point in the
ROM where the lever arm is horizontal (the ro-
tational resistance, or torque, than equals
M = F x d). At other angular positions the effec-
tive lever arm is the cosines of the real lever arm.
The torque than equals M = F x d x cos(α).
The trajectory is set by means of pin 1 and disc
A (see fig 2)
Move both the lever arm as the resistance arm
to the angular position where the maximum re-
sistance should be produced.
In this position one should pull pin 1 and move
the lever arm (thus independent of the resist-
ance arm) to vertical position.
Lock this position with pin 1.
4. Setting the range of motion (ROM)
4.1. In case the Quadriceps bench is not in use, we
recommend to move both ROM limiters to it's
0 position. To accomplish this pull pin 1 and
move both disc B and disk C in such a way
that both ROM limiters are pointing upwards.
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