The validity and test-retest reliability of the Reactive Neurocognitive Upper Extremity Tests (Reactive CKCUEST and Reactive 90/90 Wall Throws Test) will be analyzed through this protocol. Participants will undergo three assessment sessions spaced one week apart: measurements will be conducted using the Catchpad device during the first and third weeks, and the BlazePod™ device during the second week. To ensure blinding, the personnel responsible for conducting the assessments, recording the data, and performing the statistical analyses will be distinct individuals. Participants will be familiarized with the devices one week prior to testing, and a standardized 5-minute free walking warm-up will be administered at each session. All assessments will be performed under similar environmental conditions and at consistent times of day.

The test is performed bilaterally twice, each lasting 15 seconds. Three LED lights are arranged with a distance of 36 inches between them. Two LED lights on the same side are positioned 12 inches apart, while a single LED light is placed centrally between the two lights on the opposite side. The LEDs are arranged in a home base pattern, and the lights are configured to change instantaneously upon being touched, with zero delay. The target colors are set as blue for the two LEDs on the same side and red for the single LED on the opposite side. The athlete begins in a high plank position, with hands centered among the LEDs and feet shoulder-width apart. The participant is instructed to stabilize on one arm and sequentially touch the blue LEDs that light up on the same side, followed by the red LED on the opposite side, alternating between the blue and red LEDs using one hand. The objective is to touch as many lights as possible within the allotted time. Upon completion, the total number

This test is performed bilaterally in two trials of 15 seconds each. Three LED lights are vertically aligned on a wall, spaced 12 inches apart. The lights are positioned 6 inches from the corner, with the middle light placed 5 feet above the ground. An identical setup is arranged on the opposite wall or corner for the contralateral limb. The LEDs are programmed so that one target light (blue) illuminates while the other two display random distracting colors. The lights change immediately upon touch with zero delay.

The athlete stands facing the wall, holding a 2 lb plyoball in 90 degrees of shoulder abduction and 90 degrees of elbow flexion. They are instructed to continuously perform wall throws while maintaining shoulder and elbow alignment, and to touch the target-colored LED as many times as possible with the throwing hand. The non-throwing hand is used to follow the target color. Upon test completion, the total number of touches, number of errors, and average reaction time are r