key: cord-0203706-7ujnfmqc authors: Nishiyama, Yuuki; Kakino, Yuui; Naka, Enishi; Noda, Yuka; Hashiba, Satsuki; Yamada, Yusuke; Sasaki, Wataru; Okoshi, Tadashi; Nakazawa, Jin; Mori, Masaki; Mizutori, Hisashi; Shiota, Kotomi; Nagano, Tomohisa; Tokairin, Yuko; Kato, Takaaki title: Physical Activity Analysis of College Students During the COVID-19 Pandemic Using Smartphones date: 2021-03-11 journal: nan DOI: nan sha: f8fb8f122e62dd2fb5ef4fbe450938da5ce2ca48 doc_id: 203706 cord_uid: 7ujnfmqc Owing to the pandemic caused by the coronavirus disease of 2019 (COVID-19), several universities have closed their campuses for preventing the spread of infection. Consequently, the university classes are being held over the Internet, and students attend these classes from their homes. While the COVID-19 pandemic is expected to be prolonged, the online-centric lifestyle has raised concerns about secondary health issues caused by reduced physical activity (PA). However, the actual status of PA among university students has not yet been examined in Japan. Hence, in this study, we collected daily PA data (including the data corresponding to the number of steps taken and the data associated with six types of activities) by employing smartphones and thereby analyzed the changes in the PA of university students. The PA data were collected over a period of ten weeks from 305 first-year university students who were attending a mandatory class of physical education at the university. The obtained results indicate that compared to the average number of steps taken before the COVID-19 pandemic (6474.87 steps), the average number of steps taken after the COVID-19 pandemic (3522.5 steps) has decreased by 45.6%. Furthermore, the decrease in commuting time (7 AM to 10 AM), classroom time, and extracurricular activity time (11 AM to 12 AM) has led to a decrease in PA on weekdays owing to reduced unplanned exercise opportunities and has caused an increase in the duration of being in the stationary state in the course of daily life. や心肺機能異常，継続的な倦怠感などの後遺症 [2] , [3] , [ Evolution of Altered Sense of Smell or Taste in Patients With Mildly Symptomatic COVID-19 Outcomes of Cardiovascular Magnetic Res-onance Imaging in Patients Recently Recovered From Coronavirus Disease 2019 (COVID-19) Symptom duration and risk factors for delayed return to usual health among outpa-tients with covid-19 in a multistate health care systems network -united states Covid-19 dashboard by the center for systems science and engineering (CSSE) The impact of coronavirus on global activity Activity bounces back as lockdowns lift, but some healthy gains are slipping Sitting Time and All-Cause Mortality Risk in 222 497 Australian Adults Too much sitting: The population-health science of sedentary behavior. Exercise and sport sciences reviews Too much sitting -a health hazard Smartphone sensing methods for studying behavior in everyday life Cor-relates of stress in the college environment uncovered by the application of penalized generalized estimating equations to mobile sensing data Studentlife: Assess-ing mental health, academic performance and behavioral trends of college students using smartphones Smartgpa: How smartphones can assess and predict academic performance of college students Covid-19 related mobility reduction: Heteroge-nous effects on sleep and physical activity rhythms. Sleep Ob jectively-assessed physical activity, sedentary behavior, smartphone use, and sleep patterns pre-and during-covid-19 quarantine in young adults from spain Mental health and behavior of college students during the early phases of the covid-19 pandemic: Longitudinal smartphone and ecological momentary assessment study 心身の 状態を整え学生同士の繋がりを情報の力で支援するコロ ナ禍でのオンライン体育授業 (査読中).デジタルプラクテ ィス iOS crowd-sensing won't hurt a bit!: Aware framework and sustainable study guideline for iOS platform 研究報告ユビキタスコンピューティン グシステム (UBI)