5.2.1 User Manual Isoforce
REV 5
01st July 2014
page 9 von 77
TUR Therapietechnik GmbH | Grubenstr. 20 | 18055 Rostock | Germany
Eccentric contraction involves a “training” of the non-contractual elements of muscle so that the muscle
“learns” to function in a higher force environment. I
t has been suggested that eccentric exercise
produces the greatest force in the least amount of time, while it is said to enhance muscle force
production and are less costly metabolically than concentric contractions
There are a few things to consider when setting the angular velocity in isokinetic mode: Exercising
every 30 degrees/second will help you overcome the specificity of strength gain. Higher velocities are
ideal for endurance gains without putting too much pressure on joints.
The Reactive Eccentric mode may be used to work on proprioception. When torque limits are set, the
subject must exert at least one-tenth of the torque limit to keep the shaft moving. If the subject exceeds
the limits, the unit will stop.
1.2.2. The Passive Mode
The Iso-Force Passive mode allows the dynamometer to provide continuous motion at constant
velocity, with direction changes occurring only when range of motion limits are reached.
In Passive mode, the dynamometer initiates motion when the Start button is pressed, requiring no
active participation by the subject.
CPM acts to reduce blood and fluid accumulation in and around joints that have been traumatized or
undergone surgery. In this way, CPM is useful in avoiding the development of subsequent joint stiffness
in the first few hours or days. Avoiding stiffness in the early stages minimizes its chances of progression
to fibrosis of the joint and establishment of contracture. Long-term benefits, however, are predicated on
preventing the accumulation of blood and/or edema fluid in the joint or periarticular tissues. This is
accomplished by the immediate application of a full range of passive motion on CPM, or by briefly
elevating and splinting the limb in a position that keeps the periarticular tissues stretched before
instituting a full range of passive motion on CPM. In the event that the patient is temporarily prevented
from using the machine due to other medical or technical factors (if, for example, the machine breaks
down) and periarticular swelling does occur, it must be reduced by alternately stretching the joint at its
limits of flexion and extension to work the fluid out of the periarticular region.
CPM is indicated to prevent stiffness and to maintain motion obtained at the time of surgery,
particularly following joint replacement, synovectomy, contracture release, excision of heterotopic
ossification, and fixation of intra-articular fractures. This is particularly true for joints that were stiff
preoperatively. It is relatively contraindicated if the soft tissue constraints (ligaments) are insufficient, if
the joint is unstable, or if rigid fixation of fractures has not been attained. By following these guidelines
and adhering strictly to the principles of CPM use, one will increase the chances of obtaining maximum
range of joint motion following trauma or surgery. It would be anticipated that proper application of CPM
would, indeed, be cost effective, because it would decrease the need for physical therapy and joint
manipulation under anesthesia, and later rehabilitation or surgical intervention to treat stiffness.
The Passive mode may be used to exercise or test isokinetically. Subjects that cannot meet the speed
will be passively moved through this portion of the range. The mode can also be used to stimulate joint
and muscle mechanoreceptors to improve proprioception.
