ExerG - an exergame-based training device for the rehabilitation of older adults: a functional model usability study.

Background: Exergames are interactive technology-based exercise programs. By combining physical and cognitive training components, they aim to preserve independence in older adults and reduce their risk of falling. This study explored whether primary end users (PEU, healthy older adults and patients with neurological and geriatric diagnoses) and secondary end users (SEU, health professionals) evaluated the ExerG functional model to be usable, providing a positive experience and therefore acceptable.

Methods: We conducted a multi-methods study using several assessments to quantify usability and enjoyment outcomes, along with semi-structured interviews to gain an in-depth understanding of the users' experiences. Descriptive statistics were used for quantitative outcome measures. For qualitative data, a thematic analysis (TA) using an inductive, data-driven approach was carried out to develop themes for each user group.

Results: We interviewed 20 PEUs (13 healthy older adults, 7 patients) and 22 SEUs at two rehabilitation centres in Austria and Switzerland. Users' scores of over 70 on the System Usability Scale denoted good usability. On the Physical Activity Enjoyment Scale-16, both PEU groups rated the ExerG highly. Our TA approach identified four themes per user group. Themes from both PEU groups confirmed their enjoyment of training with the ExerG, however more variety and greater challenges were requested. Whilst the patient group appreciated the security given by the harness system, the healthy older adults reported feeling restricted. SEU themes reflected their approval of this novel training device, although a desire for increased difficulty and more individualisation was expressed. Clear instructions and an easy-to-use harness system were acknowledged and useful feedback for the developers emerged.

Conclusions: The ExerG is usable, offers a positive experience, and can therefore be regarded as an acceptable solution for the combined physical and mental training of older adults. Our findings contribute to the ongoing development of the ExerG, which will be a welcome addition to current training options for this target group. Further research is needed to confirm its effectiveness in preserving or improving functional independence in daily life and reducing the risk of falling.