Physical and Physiological Characterization of Custom-Made Virtual Reality Exergames: A Pilot Study

The continuous growth of the older adult population demands an urgent need to provide innovative ways to stimulate physical activity and promote functional health. This study presents FitFest, a custom-made virtual reality (VR) designed to deliver a complete physical activity (PA) session for older adults. A pilot study involving seven older adults (67.0 ± 3.8 years) was conducted, comprising 18 user testing sessions of two VR exergames: Wine Fest and Flower Fest. PA intensity and heart rate (HR) were measured. The rate of perceived exertion (RPE) and the participants' rating of the system's usability were also registered. Overall, sessions involved mostly sedentary behavior (56.5 ± 20.4%) and light PA (42.1 ± 19.3%), with an average of 436.7 steps and 92.1 bpm. Wine Fest elicited less sedentary behavior (53.6 ± 22.1% vs. 62.8 ± 16.2%), higher light PA intensity (44.7 ± 20.4% vs. 36.4 ± 17.0%), and a higher step count (503.0 ± 345.4 vs. 291.0 ± 143.1) than the Flower Fest, although not significantly. Tasks requiring cardiovascular effort and strength were rated as more physically demanding. Most participants found the system user-friendly and showed interest in continued use, though technical support was essential due to limited familiarity with VR. The findings suggest FitFest has potential to promote light PA in older adults, highlighting the importance of usability and support in tech-based interventions.