By 2050, nearly 22% of the global population will be aged 60 years or older, with Europe experiencing a particularly rapid demographic shift in which those aged over 65 years will outnumber children aged under 15 years [1,2]. This aging trend is accompanied by a rise in chronic diseases, as aging is a primary risk factor for many health conditions [3,4]. Age-related chronic diseases often lead to functional decline and social isolation, making it difficult for older adults to maintain independence and quality of life.

To shift away from a disease-centered model of aging, the World Health Organization introduced the concept of healthy aging, which focuses on preserving functional abilities through the optimization of intrinsic capacity (IC) alongside environmental support. IC encompasses the core physical and mental abilities individuals have at different stages of life, which are influenced by environmental factors and naturally decline with age. It includes 5 key domains: locomotion, vitality, sensory function, cognition, and psychological health [5-7].

Preventing chronic diseases and improving the lives of older adults require care models that focus on maintaining IC. The World Health Organization’s Integrated Care for Older People framework recommends an integrative, long-term, multidisciplinary approach centered on person-focused care [8]. However, these complex care needs place significant strain on health care and social systems that are already facing resource shortages, compounded by a limited supply of formal and informal caregivers [9-11].

Digital technologies present promising solutions to support this challenging landscape. Remote monitoring and digital health platforms can streamline and integrate the management of chronic conditions, enhancing older adults’ independence while reducing health care costs. Collectively referred to as digital health solutions, these technologies require users to have varying levels of health and digital literacy, which must be considered to ensure accessibility and adoption, especially among older adults with frailty and chronic disability [12-16]. Given the wide variability in digital skills among seniors and their preference for personal contact with health care providers, digital tools must be tailored to be simple, intuitive, and user-friendly—for example, by employing large fonts, minimal button use, and straightforward interactions [17-19].

Many digital platforms targeting healthy aging have been developed in both commercial and research settings, as summarized in Table 1. Most health monitoring platforms collect data using sensors, such as blood pressure monitors, thermometers, oximeters, smartwatches, and activity trackers, as well as digital questionnaires assessing mental well-being and social engagement. These data are typically uploaded via a gateway device, such as a tablet or smartphone, and processed in the cloud. The outcomes are usually accessible through web- or mobile-based interfaces.

The platforms differ primarily in how they process data and the services they offer. Medical system–connected platforms often alert caregivers or clinicians to abnormal physiological readings and may provide online consultation features. Home-use platforms tend to focus on personalized care plans that adapt based on the user’s current status. More advanced solutions incorporate predictive analytics to estimate the risk of future health problems or declines in capacity.

As maintaining user engagement is crucial for platform success, features such as social networking and gamification are commonly added to enhance adherence. However, usability remains a pervasive and critical challenge. Many platforms incorporate wearables, mobile apps, and surveys to cover all IC domains, but often neglect the linguistic, educational, and social diversity of older adults. This oversight results in low user acceptance and limited engagement [23,35-40]. Reported challenges include difficulties with navigation, lack of personalized experiences, software bugs, and hardware integration issues [27,33]. These barriers are frequently observed in newly developed platforms within research projects.

Caring for an aging population within the healthy aging framework requires supporting residual IC and compensating for its decline. Technology designed specifically for older adults may facilitate integrated and continuous care, thereby addressing physical and psychosocial needs more effectively.

The CAREUP project introduced an innovative digital platform for the remote monitoring of older individuals’ IC to promote inclusive health. It integrates real-time physiological, cognitive, and behavioral data, aiming to slow IC decline and support caregiver-assisted care. This paper reports on a pilot feasibility study detailing the study design and user interactions with the CAREUP platform across Italy, Romania, and Austria. The results focus on usability, acceptance, and the platform’s impact on quality of life, cognition, and physical activity. In line with current reporting standards for digital health implementations, this work was structured according to the iCHECK‑DH (Guidelines and Checklist for the Reporting on Digital Health Implementations) to enhance completeness, transparency, and reproducibility of the implementation description. The completed iCHECK‑DH checklist is provided as Multimedia Appendix 1.

The pilot feasibility study was one of the main objectives of the CAREUP project, aimed at evaluating the platform in a real-life environment and collecting feedback from actual users. A mixed methods design was used to collect data from primary (older adults) and secondary users (formal or informal caregivers). End users (primary and secondary) were enrolled by project partners in 3 European countries (Austria, Italy, and Romania) from September 2024 to December 2024.

The research protocol was approved by the Ethics Committee of IRCCS INRCA (Istituto Nazionale di Ricovero e Cura per Anziani) on March 30, 2023 (approval number D/GEN 91).

The CAREUP platform integrates Android apps installed on a tablet (Careplan and Positive Health [PH]), smart devices, and an online dashboard (CAREUP’s Portal Web Interface). The CAREUP platform concept is presented in Figure 1, and a brief description of the platform components is provided in Table 2. The technical aspects of the platform and the implemented algorithms are described in more detail elsewhere [34].

The platform operation follows a common pattern in which primary users, using the platform devices, collect multimodal health data, such as the number of steps taken per day, blood pressure, oxygen saturation, body weight, and sleep quality. The core platform app is the Careplan app, which acts as the entry point to all platform apps. Its main purpose is to collect data from the medical devices. For supported Bluetooth-enabled devices, data are transferred and uploaded automatically using standard, secure protocols; for others, results can be entered manually. The Careplan app presents users with a personalized care plan, including tips for maintaining their IC at the required levels. Users can also access the PH app and the game section through provided links, featuring cognitive games selectable from both commercial and CAREUP-specific options.

The PH app is designed to collect health data that cannot be captured with smart devices. It includes digital health questionnaires to gather information on aspects such as well-being, emotions, and social activities, as well as 2 locomotion tests to assess physical performance. The PH app questionnaires are brief and consist of 3-4 closed-ended questions selected from a pool of 89 items derived from standardized and ad hoc reference questionnaires (Table 3). To reduce respondent burden, the PH app questionnaires do not address family situation, cognition, religion, or instrumental activities of daily living. A questionnaire for a given day is generated according to a predefined 4-week cycle, during which each question is asked at least once. Questions from specific reference questionnaires are distributed throughout the cycle to avoid monotony and maintain user engagement. If a user forgets to complete the PH app on a given day, the prepared questions are presented the following day. The questionnaire generation cycle is described in detail in Multimedia Appendix 2.

The app’s locomotion tests implemented selected components of the Short Physical Performance Battery, specifically the chair stand and balance tests. The PH app also provides users with appropriate instructions to enable them to perform the tests at home.

Results from device measurements and from the PH app’s questionnaires and tests are uploaded to the platform via a Representational State Transfer (REST) application programming interface using the secure HTTPS protocol. In addition, any application programming interface operation requires a valid token to be provided with the request. Tokens are generated only for logged-in users and have an expiration date. After a prolonged break of a few days in platform use, the user must log in again.

The results are stored in a secure database in the CAREUP cloud. For additional data security, they are pseudonymized, and they cannot be directly linked to users’ personal information without access to additional data. The collected results are used for weekly assessments of primary users’ health status and IC. They also serve as the basis for preparing personalized care plans and IC prognoses.

Summaries and graphs of the analysis results are automatically generated and presented in the CAREUP Portal Web Interface, the online dashboard of the CAREUP platform. This browser-based interface can be accessed by both primary and secondary users using personal credentials to review health status and monitor changes in IC among older adults. In addition, the Web Portal provides access to results from medical devices and outcomes of game sessions completed by the primary user.

Data collection was conducted at 3 time points: the baseline evaluation (T0), the intermediate evaluation (T1), and the final evaluation (T2).

The primary outcomes, assessed at T1 and T2, aimed to evaluate the system’s usability, user experience, and acceptance. Perceived usability of the platform (mobile apps, devices, and online dashboard) was assessed using the System Usability Scale (SUS) [55]; user experience was assessed using the User Experience Questionnaire short version (UEQ-S) [56]; and acceptance was evaluated using an ad hoc qualitative questionnaire consisting of open-ended questions.

The SUS score indicates excellent usability if it is over 80.3 (grade A), good usability from 68 to 80.3 (grade B), and poor or unacceptable usability if it is less than 51 (grade F). The UEQ-S focuses on pragmatic quality (usability-related aspects such as efficiency, clarity, and task support) and hedonic quality (emotional and aesthetic appeal, excitement, and innovation). Its score ranges from –3 to +3 and represents a very bad (–3.00 to –0.81), neutral (–0.80 to 0.80), good (0.81-1.40), excellent (1.41-2.00), or outstanding (2.01-3.00) experience. Acceptance refers to the degree to which users are willing to use a form of technology and was assessed using ad hoc open-ended questions.

The secondary outcomes included various health variables evaluated at T0, T1, and T2. Physical health was assessed using the 12-Item Short Form version 2 (SF-12 v2) survey [43] and the Instrumental Activities of Daily Living (IADL) scale [44]. Perceived loneliness was assessed using the UCLA Loneliness Scale (UCLA version 3 [UCLA v3]) [45], and social interaction was assessed using the Lubben Social Network Scale—Revised (LSNS-R) [46]. Quality of life was assessed using the EQ-5D-5L [41]. Cognitive and mood health were assessed using the Montreal Cognitive Assessment (MOCA) [48] and the 15-item Geriatric Depression Scale (GDS-15) [42], respectively. Spiritual well-being was assessed using the Spiritual Well-Being Scale score [52], and cognitive game experience was assessed using the Game Experience Questionnaire [57]. In addition, care workload among secondary users was assessed as a secondary outcome using ad hoc questions.

The SF-12 [43] provides 2 summary scores: 1 for the physical component summary and 1 for the mental component summary. The UCLA v3 [45] score can range from 20 to 80, with higher scores indicating greater feelings of loneliness and isolation (scores: 20-30, low loneliness; 31-50, moderate loneliness; and 51-80, high loneliness). The LSNS-R [46] focuses on the quality and quantity of social relationships; higher scores indicate a wider and more supportive social network (scores: 12-30, low social support; 31-44, satisfactory network with room for improvement; and 45-60, strong and supportive social network). The GDS-15 [42] score ranges from 0 to 15. Values up to 5 indicate a normal condition, while scores from 5 to 10 indicate moderate depression and scores from 11 to 15 indicate severe depression. The Spiritual Well-Being Scale [52] total score ranges from 20 to 120, with higher scores indicating greater spiritual well-being. The EQ-5D-5L [41] measures health-related quality of life using 5 items, and the Visual Analogue Scale, with values ranging from 0 to 100, measures the person’s perceived state of health. The MOCA [48] has a maximum score of 30 points and generally indicates the presence of cognitive impairment when the score is 26 or lower. The Game Experience Questionnaire [57] measures the player’s emotional and cognitive status after playing games, and its score follows a 5-point Likert scale ranging from 0 (not at all) to 4 (extremely).

At T0, the primary and secondary users were asked to sign the informed consent form. Sociodemographic data were then collected from all participants. The initial evaluation of the primary users also included the MOCA [48] assessment to evaluate cognitive status and the User-Centered Goals questionnaire to define personal health goals and ambitions. Each primary user was provided, on a free-loan basis for the entire duration of the study, with all necessary equipment, including a tablet equipped with a SIM card for internet access and a selection of smart medical devices. Through the tablet, users could access the CAREUP platform apps and the online dashboard. Users were asked to select the smart devices they wished to test, and only the selected devices were provided.

Participants received detailed explanations on how to use the system and its role in supporting and monitoring their health and IC. An introductory training phase was also conducted at the start of the pilot at each study site. During this phase, users received a manual in their native language along with recommendations for system use. Participants were instructed to access the tablet apps at least once a week; use the devices at least 2-3 times per week; complete the questionnaires and locomotion test once a week; and play the games as desired. All collected data (measurement values and IC graphs) could be checked daily or weekly by both primary and secondary users through the web portal (online dashboard).

Primary users were invited to use the platform according to these recommendations from T0 to T2, covering the entire pilot period of approximately 2 months. Details of the assessments conducted at T0, T1, and T2 are summarized in Table 4.

The following section describes the outcomes of the pilot study. The pilot study data were uploaded to the Zenodo repository and are publicly available [59]. The dataset includes the results of the T0, T1, and T2 assessments; physiological measurements performed using the medical devices; and responses to the PH app questionnaires. The data are accompanied by anonymized demographic information for the users.

The dataset was curated at the end of the pilot study, and all data were cleaned and encoded using Python (Python Foundation) and the pandas package. The data are stored in standard CSV format. Instructions for dataset use, including a description of the file structure and variable dictionary, are available in the dataset description PDF file. The repository also includes exemplary Python code for dataset loading and visualization.

In the following analysis, data are reported using mean values (a measure of central tendency representing the typical value of the dataset), frequencies (indicating how often a particular value or category appears in the dataset), and P values (used to determine whether observed differences or associations in the data are statistically significant). Statistical analyses included the Wilcoxon test and ANOVA for continuous variables, whereas the chi-square test was used for categorical variables. These analyses were conducted using Python (version 3.11), leveraging libraries such as SciPy for statistical testing, pandas for data handling, and Seaborn for visualization. A descriptive flowchart of all study stages is presented in Figure 2.

A total of 66 older adults participated as primary users: 30 were enrolled in Italy, 25 in Romania, and 11 in Austria. Their caregivers were involved as secondary users (7 in Romania, 5 in Austria, and 5 in Italy).

In Romania, 2 primary users (who enrolled without caregivers) withdrew after the first week of the pilot because they considered the platform too difficult to use and requiring IT knowledge that they did not have. There were also 3 primary user dropouts in Austria: 2 withdrew during the first week after recruitment, and 1 withdrew after the T1 phase. These users did not perceive any benefit from using the system. The pilot was therefore completed by 61 primary users and 17 secondary users. Not every primary user (older adult) was assigned a secondary user (caregiver), as the inclusion criteria for primary users required them to be in good health and not in need of caregiver support for daily activities.

The primary users included 37 women and 24 men, with a mean age of 73.9 years. Most participants were married (n=36), whereas 14 were widowed, 4 divorced, 3 separated, 2 single, and 2 in a full-time relationship. Regarding education level, 27 older adults had a secondary education, 28 had a tertiary education (university or further education), 5 had a primary education, and 1 had no formal education. Most participants (n=54) lived in urban areas, whereas 7 lived in rural areas.

The secondary users included 10 men and 7 women, with a mean age of 47.5 years. All were informal caregivers except for 1 formal caregiver from Italy. Full sociodemographic details are presented in Table 5.

Adherence to platform use was defined as the proportion of days between the first and last app use relative to the individual study period, whereas app usage referred to the total number of distinct days on which the app was used (Figure 3).

The CAREUP pilot feasibility study evaluated the usability, user experience, and acceptance of an integrated care platform for tracking the IC of older individuals using various monitoring devices. Secondary outcomes included assessments of physical and mental health, quality of life, social interaction, and caregiver workload.

The CAREUP platform demonstrated both successes and challenges during the study. Although participant numbers varied across countries, no direct correlation was found between country and SUS scores. Differences in SUS ratings appeared to be more closely related to factors such as device connectivity, interface clarity, and users’ digital literacy levels than to cohort size [60]. These findings suggest that local contextual and technical conditions have a stronger impact on usability perceptions than the number of participants at each site. Digital skills vary among individuals according to their level of autonomy in using technology and are influenced by socioeconomic status [61]. Specifically, Austria’s lower scores highlighted issues with device connectivity and interface clarity that remained largely unresolved by the end of the trial. By contrast, Romania’s favorable scores suggested that the platform could be effective and well-received when it functions smoothly.

Despite these usability challenges, many older adults (the primary users) viewed CAREUP as engaging, innovative, and empowering. Adopting a technological health solution can initially pose varying degrees of difficulty, depending on an individual’s prior experience and available resources [62]. Nonetheless, most people are willing to learn and adopt new digital tools if they perceive tangible benefits for their health and well-being [63]. User experience assessments reflected a predominantly positive outlook, especially regarding the platform’s “hedonic qualities”—its emotional appeal. Participants valued access to cognitive games and health-monitoring features, which introduced stimulation and novelty into their daily routines. Nevertheless, some critical feedback was noted.

Acceptance among older adults and caregivers revealed a nuanced picture. Many users expressed enthusiasm for CAREUP, appreciating its capacity to track health parameters and support proactive health management. However, persistent technical obstacles—such as connectivity issues between devices and software—tested participants’ patience. Both groups also found the number of required devices cumbersome. Although health technologies are becoming increasingly accepted in older adults’ lives, partly accelerated by the COVID-19 pandemic [64], a digital divide remains, contributing to divergent views on acceptance. Although older adults typically acknowledge the benefits of technology for improving care efficiency and quality, they often struggle with adaptation. Therefore, promoting digital literacy is crucial for fostering their engagement and inclusion in the digital health care landscape [65].

As secondary users, caregivers brought a nuanced perspective to CAREUP. They valued its ability to reduce worry through continuous health monitoring and to provide structured insights into their loved ones’ health. However, many also found the system unnecessarily complex. This tension between appreciation and frustration highlighted the need for targeted refinements, particularly simplifying the platform and improving reliability. For digital solutions to succeed, it is vital to involve all key end users—patients, caregivers, and health care professionals—early in development [66]. Caregivers, in particular, play a pivotal role; thus, it is essential not only to engage them but also to provide sufficient digital training. Empowering caregivers in this way enables them to support older users more effectively and substantially increases the accessibility and success of digital solutions [67]. More broadly, the CAREUP pilot exemplified both the challenges and opportunities associated with introducing technology into complex, human-centered settings. Technical reliability emerged as a major challenge, repeatedly undermining the user experience. Frequent Bluetooth issues and software glitches frustrated users and, at times, alienated them from the platform. This underscores the cost of technological shortcomings: regardless of innovation, systems must function seamlessly to earn users’ trust and loyalty. Poor reliability can foster frustration, leading to abandonment and an increased risk of digital exclusion [68]. Multiple factors influence the use of digital technology, and disengagement may stem from psychological reasons (such as low motivation, lack of confidence, or perceived lack of usefulness), physical barriers (such as limited access), or practical challenges (including insufficient digital skills) [69].

The issues described are also common in other platforms evaluated in usability studies reported in the literature. Issues such as connectivity problems leading to delayed data availability [22] and difficulties understanding how to use specific components [23,27,33] are particularly prevalent in novel solutions. Interface aesthetics are also a commonly raised concern, with users often requesting personalization options to better tailor the solution to their preferences [70].

Another key takeaway from the pilot was the importance of user education and support. Although digital technologies are a valuable resource in health care, older adults still lag significantly behind younger individuals in their use of these technologies [71]. Their limited digital health literacy is influenced by both subjective factors—such as anxiety, stress related to technology use, and lack of confidence—and objective factors [72]. These include sociodemographic factors (eg, age, education level, and economic status), digital device-related factors (eg, internet access and usability challenges), and social support factors (eg, support provided by family members) [73].

Even though each pilot site organized an instructional phase at the beginning of the pilot and provided a user manual, some participants, especially those less familiar with technology, struggled to fully understand the platform’s capabilities. This was particularly evident during the early phase of the trial, when users were still acclimating to the system. User comments also highlighted the potential value of video tutorials or in-person training for enhancing familiarity and confidence with the system. This may serve as a recommendation for future implementation. Given the persistent gap between the availability of digital health solutions and older adults’ ability to use them effectively, ensuring adequate digital health literacy is essential [74]. To provide tailored support, it is important to first assess users’ level of digital literacy, specifically their ability to search for, navigate, understand, and evaluate digital health information and tools [75].

The CAREUP pilot study demonstrates the potential of integrated digital health platforms to support healthy aging through IC monitoring. Despite the challenges associated with introducing technology into human-centered health care, the platform’s positive outcomes highlight the promise of digital health solutions for the future. The study also underscores the importance of cultural adaptation in digital health interventions, demonstrating that optimal adoption of multidimensional health-monitoring technologies among older adults requires attention to technical reliability, user interface design, and cultural context. Variations in usability scores across countries further emphasize this need.

Technical reliability is essential for user acceptance, as connectivity issues and software glitches can undermine the user experience and lead to platform abandonment.

However, system complexity and the need for digital literacy support underscore the importance of engaging all stakeholders—patients, caregivers, and health care professionals—early in the development process.

Future implementations of digital health platforms for aging populations must address technical infrastructure, user-friendly interfaces, comprehensive education, cultural adaptation, and multidimensional health monitoring. By meeting these requirements, platforms such as CAREUP can more effectively support healthy aging and enhance the quality of life of older adults and their caregivers.

The pilot also highlighted that technology-based interventions often focus on single domains (physical, cognitive, mental, emotional, etc) rather than adopting a multidimensional approach to health promotion. Expanding research in this direction could substantially strengthen the evidence base and further advance the field.