In this study, upper extremity anthropometric characteristics, functional upper extremity skills, and reaction time will be examined in healthy young adults. A total of 46 healthy individuals aged between 18 and 25 years, with no history of systemic disease or upper extremity injury affecting functional performance, will be included. Upper extremity anthropometric measurements, including arm, forearm, and hand lengths and circumferential measurements, will be obtained using standardized procedures. Functional upper extremity skills will be assessed using the Purdue Pegboard Test, and reaction time will be evaluated using the Nelson Hand Reaction Test. Correlation analyses will be performed to examine the relationships between upper extremity anthropometric characteristics, functional upper extremity skills, and reaction time.

Inclusion Criteria:

• Aged between 18 and 25 years
• No medical condition requiring regular medical supervision
• No history of upper extremity injury resulting in sequelae or any upper extremity injury within the past year
• Ability to communicate verbally and in writing in Turkish or English

Exclusion Criteria:

• Presence of postural abnormalities, movement restrictions, or pain affecting grasping or upper extremity function, as determined by inspection
• Adhesions, muscle shortening, or restricted joint range of motion affecting the neck muscles
• History of cervical canal stenosis or cervical disc herniation
• Significant impairment of balance system function
• Visual or sensory function disorders
• Upper extremity muscle tone disorders, including essential tremor