Validity, Reliability, and Clinical Correlates of Immersive Virtual Reality Adaptation of the Five Times Sit-to-stand Test and Timed up and go Tests in Women With Fibromyalgia Syndrome

Fibromyalgia syndrome (FMS) is a chronic rheumatic condition characterized by widespread pain, fatigue, and functional impairments that negatively affect physical activity levels, muscle strength, balance, and functional mobility. These impairments may lead to reduced functional capacity and increased sedentary behavior. Therefore, objective assessment of mobility, balance, and functional performance is essential in individuals with FMS. Performance-based tests such as the Five Times Sit-to-Stand Test (5xSTS) and the Timed Up and Go (TUG) test are commonly used to evaluate lower extremity muscle function, balance, and functional mobility due to their simplicity, feasibility, and clinical relevance. Recently, virtual reality (VR)-based assessment methods have emerged as a standardized and objective approach for evaluating functional performance. This study aims to investigate the feasibility and measurement properties of virtual reality-based adaptations of the 5xSTS and TUG tests in individuals with fibromyalgia syndrome using a head-mounted VR system. Findings from this study are expected to contribute to the clinical use of VR technology in mobility and balance assessment in individuals with FMS.