Feasibility of Virtual Reality-assisted Ergometer Cycling in Addition to Regular Rehabilitation During Municipality-based Inpatient Rehabilitation Care

VR-C-REHAB is a single-group pilot and feasibility study examining the practicality of implementing virtual-reality-assisted ergometer cycling as an adjunct to usual municipal inpatient rehabilitation for older adults (≥65 years). Many individuals admitted to temporary inpatient care present with low physical activity levels and fluctuating motivation, reducing the achievable exercise dose. Virtual reality may enhance engagement, enjoyment, and adherence, but its feasibility in this setting must be evaluated before conducting a future effect trial. The primary objective is to determine whether participants can achieve an adequate exercise dose, defined as the proportion of completed VR-cycling sessions out of those offered (target: ≥75%). Secondary feasibility outcomes include recruitment rate, safety and acceptability, and total cycling time. Exploratory outcomes include change in the 10-Meter Walk Test and session-level motivation (0-10). The intervention consists of 15 minutes of VR-assisted cycling, three times weekly for up to four weeks, delivered alongside standard rehabilitation. Data are collected at baseline, during each session, and at completion. Analyses are descriptive, focusing on the precision of feasibility estimates. Progression criteria (Go/Amend/Stop) are based on adherence, recruitment, and safety. The results will inform the design and implementation of a subsequent controlled study.