@文章{info:doi/10.2196/35628，作者="吉村荣一和田尻，Eri和Michiwaki，良田和松本，直行和畑本，洋一和田中，重浩"，标题="使用步数的长期影响——特定的智能手机应用程序对身体活动和减肥:随机对照临床试验"，期刊="JMIR Mhealth Uhealth"，年="2022"，月="10"，日="24"，卷="10"，数="10"，页="e35628"，关键词="步数;减肥;智能手机应用;步数——特定的手机应用;身体活动;中等到高强度的体育活动;生活方式干预;移动健康;背景:一些关于使用智能手机应用程序促进减肥的研究表明，使用智能手机应用程序可以减肥，但并没有增加身体活动。然而，到目前为止，智能手机应用程序对减肥和增加身体活动的长期影响还没有得到严格的检验。 Objective: The aim of this study was to assess whether the use of a smartphone app will increase physical activity and reduce body weight. Methods: In this parallel randomized clinical trial, participants recruited between April 2018 and June 2019 were randomized in equal proportions to a smartphone app group (n=55) or a control group (n=54). The intention-to-treat approach was used to analyze the data from December 2019 through November 2021. Before the intervention, an hour-long lecture on weight loss instruction and increasing physical activity was conducted once for both groups. Participants in both groups were instructed to weigh themselves immediately after waking up at least once daily from the start of the intervention. Monthly emails were sent advising the participants in both groups on how to lose weight and increase physical activity in order to maintain or increase motivation. Participants in the smartphone app group were instructed to open the app at least once a day to check their step count and rank. The primary outcome was daily accelerometer-measured physical activity (step count) and the secondary outcome was body weight. Since there was a significant difference in the wear time of the accelerometer depending on the intervention period (P<.001), the number of steps and moderate-to-vigorous physical activity were also evaluated per wear time. Results: The mean age of the 109 participants in this study was 47 (SD 8) years. At baseline, the mean daily total steps were 7259 (SD 3256) steps per day for the smartphone app group and 8243 (SD 2815) steps per day for the control group. The difference in the step count per wear time between preintervention and postintervention was significantly different between the app group and the control group (average difference [95{\%} CI], 65 [30 to 101] steps per hour vs --9 [--56 to 39] steps per hour; P=.042). The weight loss was --2.2 kg (SD --3.1{\%}) in the smartphone app group and --2.2 kg (SD --3.1{\%}) in the control group, with no significant difference between the groups. In addition, when divided into weekdays (Monday through Friday) and weekends (Saturday and Sunday), there was a significant interaction between step counts (P=.004) and MVPA (P=.003) during the intervention, with the app group showing higher interaction on weekends than the control group. Conclusions: In this trial, the group with the smartphone app intervention showed increased physical activity, especially on weekends. However, this increased physical activity did not lead to increased weight loss. Trial Registration: University Hospital Medical Information Network UMIN000033397; https://center6.umin.ac.jp/cgi-open-bin/ctr{\_}e/ctr{\_}view.cgi?recptno=R000037956 ", issn="2291-5222", doi="10.2196/35628", url="https://mhealth.www.mybigtv.com/2022/10/e35628", url="https://doi.org/10.2196/35628", url="http://www.ncbi.nlm.nih.gov/pubmed/36279159" }