Reliability of the Modified CKCUEST and correlation with shoulder strength in adolescent basketball and volleyball players.

• Reliability of the MCKCUEST was good to excellent and clinically acceptable. • Weak correlation was found between the MCKCUEST power score and isometric strength. • The MCKCUEST enables to standardize the test to any adolescent population. Physical performance tests provide a more complete picture of the functional status of the athlete's upper extremity. The primary purpose was to evaluate the reliability of the Modified Closed Kinetic Chain Upper Extremity Stability Test (MCKCUEST) in adolescent volleyball and basketball players. The secondary objective was to evaluate the relationship between the MCKCUEST and shoulder rotation isometric strength in this population. Seventy-three healthy basketball (n = 39) and volleyball (n = 34) players participated to establish the reliability and correlations of the MCKCUEST. We used a two-session measurement design to evaluate the reliability of the MCKCUEST. Shoulder rotation isometric strength was performed to determine relationships with the MCKCUEST. The intraclass correlation coefficients (ICC 2,1) for intra-session reliability of the MCKCUEST ranged from 0.86 to 0.89, and the between days test–retest reliability (ICC 3,1) was 0.93. The standard error of measurement (1 touch) and the minimal detectable change (3 touches) showed clinically acceptable absolute reliability values. A weak correlation was found between the MCKCUEST power score and shoulder rotation isometric strength (r values between 0.3 and 0.4). Results demonstrated good to excellent relative reliability and clinically acceptable absolute reliability values for the MCKCUEST on adolescent basketball and volleyball athletes. Performances on the MCKCUEST were weakly associated with shoulder rotation strength. [ABSTRACT FROM AUTHOR]