Fontan Group Inclusion Criteria

be between the ages of 8-50 Having undergone Fontan operation in our hospital or another center Clinical stability of the patients (preserved ventricular function), No change in ongoing drug therapy that adversely affects clinical stability, At least 1 year after the operation and to be followed in the Pediatric Cardiology Polyclinic of our hospital

Fontan Group Exclusion Criteria:

Inability to access the patient's medical data Neurological and/or genetic musculoskeletal disease Having orthopedic and cognitive problems that prevent testing The patient's and/or family's unwillingness to participate in the study

Control Group Inclusion Criteria:

Not have cardiovascular, neurological and/or genetic musculoskeletal disease Not having orthopedic and cognitive problems that prevent testing The patient's and/or family's willingness to participate in the study

Demographic and clinical characteristics Age and complaints, post-operative follow-up, other problems, medications, ECHO and ECG findings, laboratory tests (complete blood count, liver and kidney function tests, brain natriuretic peptide (BNP) level)

Hand grip strength Right and left hand grip strength the highest of the three measurements

Lower extremity muscle strength Maximum isometric muscle strength of the quadriceps femoris

Body composition Body fat ratio, lean body weight and fat weight by bioelectrical impedance analysis

6 minute walk test The six minute walk test distance recorded in meters

Incremental shuttle walk test The lap number, the number of laps of the last level they can reach, and the walking/running distances recorded in meters

For the incremental shuttle walk test, it will be adjusted to a total of 10 meters with 2 cones placed at a distance of 9.0 meters from each other and a rotational margin of 0.5 meters. In this system, the patient will be asked to walk in a round-trip way by adapting to the increasing speed and the sound coming from outside. Walking/running distances of the patients in meters will be recorded.

The standard test protocol will be applied in a continuous 30 meter corridor. The patient wearing comfortable clothes and shoes will be given standard instructions and verbal guidance during the test. The distance the patient walked during the test will be recorded in meters.

Right and left hand grip strength will be measured using a hand grip strength hand dynamometer (Jamar, Sammons Preston, Rolyon, Bolingbrook, IL, USA). Measurements shall be made using standard procedures, right and left sides, with the arms at the side of the trunk, the elbow in a 90 degree flexion position, and the forearm and wrist in a neutral position. The highest of the three measurements will be considered as hand grip strength

The maximum isometric muscle strength of the Quadriceps femoris muscle will be measured with a dynamometer (Lafayette Instrument Company, Lafayette, Indiana).

Body fat ratio will be evaluated by bioelectrical impedance analysis. Tanita Body Fat Analyzer (model TBF 300, Tokyo, Japan) will be used during the analysis.