Healthy patients between the ages of 18 and 30 without neck problems will be included in the study.

The strength of the cervical flexor and extensor muscles will be measured with a digital hand dynamometer. While measuring with a dynamometer, the positions and methods of the fine muscle test defined by Lovett will be based on. Each muscle test with the dynamometer will be done three times. The subject will be given a break of at least one minute to rest between repetitions. The highest 3-repetitive results obtained as a result of these measurements will be recorded as the maximum power and in Newton (N) to be used in statistical analysis.

Cervical Range of Motion (CROM 3) device will be used for active evaluation of cervical range of motion. CROM 3 is a valid and reliable device . The CROM 3 instrument is a special version of the universal goniometer adapted to the cervical region, developed to evaluate cervical joint motion in 3 planes. Flexion and extension range of motion is measured on the first gravity-dependent quadrant on the side of the CROM 3 device. The gravity-dependent second quadrant CROM 3 device is located on the anterior surface and measures the degree of lateral flexion. The third quadrant is a compass dial on the upper surface of the CROM 3 device and measures the right and left rotation. In order for the compass dial to measure the degree of rotation accurately, magnetic field reinforcement, which is a part of the device, was applied to the shoulders of the subject. Flexion, extension, lateral flexion and rotation movements will be measured with the CROM 3 device.

When evaluating joint position sense, 6 positions will be evaluated including flexion, extension, right and left lateral flexion, right and left rotation. CROM 3 device will be used while making measurements. When the subject starts the test, he will be told to sit upright in a comfortable position with the arms at the sides and look forward. The head of the subject will be brought to the targeted point, slowly and passively, up to 65 percent of the maximum range of motion he has, which was previously determined by the physiotherapist. The case will be passively held at the point reached for three seconds and will be told to feel position. Then the head of the subject will be brought back to the neutral position. Then he will be told to remember the phenomenon and passively come to the point brought. The degree of error between the point and the previously determined reference point will be recorded. This process will be repeated three times and the average value will be calculated.