ERGO-FIT Power Line 4000 Owner's Manual page 49

POWER LINE 4000
of injury.
⊗ Do not let the weights impact on the weight bundle during and after exercise.
Always make sure that the weights fall smoothly on the bundle.
6.3 Eccentric function
When designing strength training machines, strength curves are often made use of.
The aim of considering strength curves is to ensure the correct and targetted
adjustment of the resistance for the respective abilities of the muscle to be trained.
This means concretely that training stimuli can be used optimally by almost all parts
of a muscle.
The technological aid for this purpose is the eccentric technique. The eccentric is
connected with the rotation axis of the exercise machine via which the load of the
training weight is transferred to the lever arm (moment arm) that is moved by the
trainee. The set weight is transferred to the outer border of the eccentric disc via a flat
belt.
Eccentric (example:
LEG EXTENSION 4000)
transferred via a long load arm to the rotation axis and vice versa (i.e. via a point of
the disc with a longer distance to the rotation point). Thus, the maximum strain on the
muscles may be realised by a high torque already at the beginning of the motion and
will be maintained almost until the final position is reached.
To meet individual needs, the moment arm may be adjusted in relation to the eccentric
to allow for strain adjustment by modifying the link positions.
Some machines of the POWER LINE 4000 are not equipped with an eccentric. This
is due to the vertical (LAT PULL 4000, SHOULDER ABDUCTION 4000, SHOULDER
Technical and optical modifications as well as misprints reserved
The edge of the eccentric does not form a concentric
radius (constant distance between outer edge and
rotation axis) around the rotation point of the disc but
an eccentric radius (variable distance between outer
edge and rotation axis). The distance between the
respective surface location of the weight plate (load)
and the rotation point determines the length of the
lever arm with which the weight pulls the plate. This
distance is called the load arm. In contrast, the length
of the lever arm (against which the trainee works)
determines the so-called moment arm. According to
the lever principle (Load x load arm = moment x
moment arm), an eccentric transfers a high torque
(more load) on the rotation axis if the weight is
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© 2013 by ERGO-FIT GmbH & Co. KG
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