Liver Transplant Recipients and 30-Second Lie-to-Sit Test

The 30-second sit-to-stand test will be used to assess participants' lower extremity muscle strength and functional capacity. In this test, the participant sits with their back against a chair, feet flat on the floor, and arms crossed over the chest, and stands up and sits down as many times as possible within 30 seconds. Hands should not touch the chair during the test, and only full, complete repetitions are counted. The total number of repetitions at the end of the test will be recorded.

Quadriceps muscle strength will be measured isometrically using a hand-held dynamometer. The participant will be seated with the knees flexed at 90°. The dynamometer will be placed on the front of the leg at ankle level, and the participant will be asked to lift the leg with maximal effort. Three measurements will be taken for each leg, and the average value will be recorded.

Isometric strength of the deltoid muscle will be assessed using a hand-held dynamometer. The participant will be seated with the shoulder positioned at 90° abduction and the elbow slightly flexed. The dynamometer will be placed on the lateral side of the upper arm at elbow level, and the participant will perform maximum-effort shoulder abduction. Three measurements will be taken for each extremity, and the average value will be recorded.

The isometric trunk flexion strength test will be performed with the participant positioned supine, with the knees extented or the hips flexed at 30°. The dynamometer will be placed below the suprasternal notch of the sternum. The participant will place their hands on the opposite acromions and perform isometric trunk flexion.

The isometric trunk extension strength, the participant will be positioned prone while lying down. The dynamometer will be placed at the T4 level, and the participant will be asked to perform maximum isometric trunk extension. In each test position, participants will first perform a submaximal trial, followed by three correct repetitions, and the average value will be recorded.

Handgrip strength will be assessed using a hand dynamometer. Participants will be seated with their shoulders adducted at the sides, elbows flexed at 90°, forearms in a neutral position, and wrists positioned at 0-30° extension and 0-15° ulnar deviation. Three trials will be performed for each hand, with a 30-second rest between trials. For analysis, the average of three measurements for both hands will be recorded.

The 2-minute walk test will be used to assess participants' exercise capacity and physical performance. During the test, participants will walk at a self-selected, safe pace for two minutes, and the distance covered in meters will be recorded.

This questionnaire consists of 15 items that assess difficulties in using the upper extremities for activities of daily living. Each item is scored from 0 (cannot do) to 4 (no difficulty). The raw score ranges from 0 to 59 and is converted to a final score ranging from 0 to 100. A higher final score indicates better upper extremity function, providing a comprehensive assessment of functional capacity.

This questionnaire is important for assessing lower extremity functional capacity and examining activity limitations in various lower extremity disorders. It consists of 20 items, each scored from 0 (extreme difficulty or unable to perform the activity) to 4 (no difficulty). Intermediate values are defined as 1 (quite difficult), 2 (moderately difficult), and 3 (somewhat difficult). The total score ranges from 0 to 80, with higher scores indicating better functional level.