20 women aged 20-50 years who were sedentary according to the International Physical Activity Questionnaire and had not participated in any pilates or yoga exercise group in the last 1 year

20 female volunteers between the ages of 20-50, practicing Pilates at least 2 days a week for at least 12 weeks

The study group was selected from women who did pilates exercises 2 days a week for at least 12 weeks under the supervision of a physiotherapist, while the control group was selected from women who did not participate in any pilates, yoga or exercise program in the last 1 year and were sedentary according to the International Physical Activity Questionnaire. Lateral Bridge Test, Static Trunk Extension Test, Trunk Flexors Endurance Test, Cervical Joint Position Error Test, Cervical Region Deep Flexor Muscle Endurance Tests were applied to the participants and Craniocervical Flexion data of the participants were evaluated with Stabilizer Pressure Biofeedback Device.

The endurance of the core muscles was used to assess the static resistance of the core region with three tests evaluating the trunk flexors, trunk extensors and lateral bridge exercise. Lateral Bridge Test, Static Trunk Extension Test (Sorensen Test) and Trunk Flexors Endurance Test were evaluated, measurements were recorded in seconds using a stopwatch. The tests were repeated twice and the best result value was recorded. The test was terminated when the person administered was unable to maintain the position or when the person said that they could not continue the test

The participant was positioned in the supine hook position with hands relaxed on the abdomen. The participant was instructed to pull his/her chin inwards (chin tuck) and lift his/her head off the bed while maintaining this position (approximately 2.5 cm). The participant was asked to maintain this position for as long as possible without distortion and the time to maintain the position was recorded in seconds. In order to perform the test correctly, the test was demonstrated to the individuals in a practical way before starting the test. The test duration was kept short to prevent pain and fatigue of the participant. The test was stopped when the jaw position (craniocervical flexion movement and jaw) was lost and sudden pain increased and the subject did not want to continue the test. A single test was performed and the time was recorded in seconds.

In our study, after the participants were placed supine on the examination bed, the pressure cell was placed under the nape of the neck without inflation. The cell was inflated to 20 mmHg, taking care not to slide the cell to the lower cervical region. The participant was asked to press the chin towards the neck without lifting the head as if saying 'yes' (posterior cervical tilt). The participant was instructed to place the tongue on the upper palate, bring the lips together but keep the teeth slightly apart.

The test consists of 5 stages. The value of the stabiliser device, which was set at 20 mmHg, was asked to increase by 2 mmHg at each stage until it reached 30 mmHg (20- 22- 24- 26- 28- 30 mmHg). The participant was asked to stay at each pressure value for 30 s and to complete the test by giving 30 s rest time after each pressure. The test was terminated at the stage where the participant could not complete the pressure value that he/she should keep constant for 30 s.