Training and Detraining Effects of a Physical Activity Program Implemented Through Mobile Applications in Adolescents.

"Before starting the intervention, a total of 465 adolescents participated in pretest measurements (T1).~Researchers in charge of explaining how the apps worked were not involved in the measurements or subsequent analysis, as they knew which student belonged to each App and control group. Once each app had been described and its use explained, a training plan was drawn up to be followed during the period of mandatory use.~The adolescents were motivated to utilize the app for a duration of ten weeks, aiming for a minimum usage of three times per week.~After the mandatory intervention with the mobile apps, post-test measurements were carried out (T2). Then, a period of 10 weeks was provided in which the use of the app was neither mandatory nor promoted from the physical education subject, after which the post-test 2 measurements (T3) were taken."