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Cybex Isokinetic Test and Exercise

Muscle strength and resistance are objectively measured with Cybex isokinetic test and exercise device and the performance-enhancing exercises are implemented depending on these measurements.



Monday- Friday

09:00 – 18:00



Memorial Şişli
+90 212 314 66 66 (Internal:2415)
+90 542 215 8080




Piyalepaşa Avenue,

No.434385, Şişli, İstanbul

Literally “isokinesis” means “equal motion.” In the context of exercise and muscle contraction, isokinetic exercise means muscle construction done with a fixed angular speed. Special devices are developed for the isokinetic exercise. On these devices, the movement can only be carried out with a constant speed independent from the force applied by the patient.

For example, the quadriceps femoris muscle, which is found in the front of the femur is responsible for the extension of the leg. In contrary, the hamstring muscles are responsible for the flexion of the leg. The whole movement has an angle between 0 and 135 degrees. If the movement is carried out with constant resistance and weight, the muscles are stretched less than desired at certain degrees and more than desired at other degrees. If the patient contracts the muscles more than desired, the movement may suddenly accelerate and cause tendon stretches and injuries. Isokinetic exercise provides an equalizing resistance to the force of the contracted muscle and thus the speed is held constant.

Which muscles and joints are suitable for the isokinetic exercise?

Isokinetic systems are used for the testing and improvement of the performance of knee, shoulder, elbow, wrist, hip, ankle joints, and muscles. Sportsmen use often isokinetic exercise to increase their performance. Isokinetic exercises are also useful in the treatment of knee osteoarthritis and anterior cruciate ligament sprains.

What Are The Benefits Of The Cybex Isokinetic Test and Exercise System?

  • An objective measurement of the muscle performance can be performed. The difference between the body sides and the strength and endurance of the antagonistic muscles can be determined. Precise measurements and presentation with numbers and graphics increase the motivation of the patients.
  • As a force equal to the muscle force is implemented, the possibility of risky stretching and twisting is low.
  • It provides a very productive exercise environment, as an optimal load can be used in every angular step of the movement.
  • Isokinetic exercise adapts itself to the performance of the patient. If the patient is not able to use the maximum force, the device reduces the resistance accordingly. Thus, the possibility of the interruption of the exercise due to pain and exhaustion is relatively lower.
  • The angles, at which the muscles are especially weak, can be determined and the exercise can be focused on this part.


What Are The Disadvantages Of The Isokinetic Test and Exercise?

  • It is expensive due to the special equipment and is not available in every health center.
  • The patient should adapt himself/herself to the directions of the trainer or therapist in order to get the most efficient results from the isokinetic exercise system.
  • The use of the device and interpretation of the measurements require a trained and experienced technician.
  • In movements comprising too many muscles, the objectivity of the device may diminish.
Robotic physical therapy systems help the patient to recover as quickly and accurately as possible.


Before starting the exercise, the characteristics of the patient are recorded in the system. The movements, which should be evaluated, are determined (e.g. flexion and extension in the knee joint). The patient is briefed about the device and exercise. Following the general warming up, the patient is positioned properly in the device. The joints, which will be not used during the exercise, are immobilized in order to execute the movement safely and efficiently. The patient is led to warm up while he/she is fastened to the device. The suitable test and exercise protocol is selected in the device. First the healthy side is evaluated so that the patient can easily adapt himself/herself to the exercise and the normal performance of the patient can be observed. Then the exercise is initiated on the weak side. During the testing and exercise, the patient is motivated and encouraged with verbal comments.

Who Should Not Use Isokinetic Exercise?

Isokinetic exercise may be not suitable for patients with cardiovascular diseases. In patients, who have uncontrolled high blood pressure, aneurysm in cerebral vessels, a history of stroke in the last 6 months, a history of heart attack in the last 6 weeks, lumbar surgery in the last three months, untreated inguinal hernia, angina pectoris and complain of paresis during the test, isokinetic exercises should be avoided. The physician or therapist will check whether there are any risks related to the exercise.

In the acute phase of the musculoskeletal system injuries; if the joints are swollen, there is an important limitation in the joint movements, abnormal movements are observed related to the injuries in the structures supporting the stability of the joint, the implementation of the exercise should be avoided.