## 3 Results  
The initial focus of our study was to analyze the recent trends in research involving monitoring devices over the past three years. Specifically, we targeted the years 2020, 2021, and 2022 to investigate the potential impact of the COVID-19 pandemic-related quarantine measures and to understand the evolving adoption of wearable devices. There were nine papers published in 2020, nine papers in 2021 and seventeen papers in 2022, showing almost the same number in the first two years and a significant rise in the last year (Figure 2). The consistent number of papers in the initial two years followed by a substantial surge in the final year indicates a significant growth in interest in wearable device research. After quality assessment, we found ten studies conducted prior to the COVID-19 pandemic, with five being undertaken in 2019 and another five in preceding years. Meanwhile, 11 studies were carried out post-March 2020, coinciding with the World Health Organization's declaration of the pandemic. Intriguingly, 14 studies lacked specific year indications for their research conduct. Among these unspecified studies, 11 were eventually published between 2021 and 2022, while 3 were published in 2020 (Figure 3). To study the relationship of authors and co-authors we explored the composition of authorship in 35 chosen articles (Figure 4). Out of total of 199 authors, [PERSON]  
Figure 3: Number of conducted research before or after pandemic. Figure 2: Number of articles by year. emerged as one of the most prolific contributors, with an involvement in four distinct papers, followed closely by [PERSON], who contributed to three. There are 19 authors who wrote two papers: [PERSON], [PERSON], [PERSON], [PERSON], [PERSON], [PERSON], [PERSON], [PERSON], [PERSON], [PERSON], [PERSON]. [PERSON], [PERSON], [PERSON], [PERSON], [PERSON], [PERSON], [PERSON], [PERSON], and [PERSON]. This indicates that a group of researchers are consistently engaged in this field. The remaining 178 authors each contributed to a single paper over the last three years, highlighting the diversity of contributors within this domain. Another valuable piece of information was the number of authors per paper. None of the selected articles were the sole work of an independent author; rather, a collective approach prevailed. Notably, papers authored by six individuals constituted the largest proportion, accounting for 28% of the sample (ten papers). This was closely followed by papers with four authors (17%, six papers), three authors (11%, four papers), and five authors (11%, four papers). Additionally, papers authored by seven, eight, eleven, and seventeen individuals each represented 6% of the sample, with two papers per category. In contrast, papers authored by two, nine, and ten individuals constituted a smaller percentage of 3% each, with one paper for each category (Figure 5). We directed our inquiry towards discerning the types of monitoring devices preferred by researchers in their investigations. Categorizing these devices into five distinct groups--shoes and insoles, sport watches, smartphones, fitness trackers, and smart clothing systems--we identified a total of 44 devices employed across various studies (as illustrated in Figure 6). Smartphones used were both Android (1) and iOS (2), while fitness trackers included Fitbit (6), Mymo (1), and Misfit Shine (1). Additionally, research included the use of smart clothing systems, such as COTS smart socks and the hitoe system. Predominantly used smartwatches in articles were ActiGraph, Apple, Coros, Fossil, Garmin, Huawei, Polar, Samsung, Suunto, and Xiaomi. The next fundamental question we posed was: which activity was measured with wearables in their research? Our analysis revealed a diverse array of activities, such as walking, running, cycling, climbing, jumping, weightlifting, training exercises (running, tennis, kayaking, and canoeing), and activities of daily living. Additionally, a few studies delved into the monitoring of resting behaviors and other physiological responses.