Received: 8 January 2019
Accepted: 15 April 2019
First Online: 13 June 2019
Ethics approval and consent to participate
: Informed consent was obtained from the participants. In addition, this study was approved by the Ethics Committee of Kagawa University Faculty of Medicine and Graduate School of Medicine (approval number Heisei28–128).
: Not applicable.
: The authors declare that they have competing interests. The study was conducted in collaboration with Kagawa University and Sin Cire Co., Ltd. KK is the director of Life, a specified nonprofit corporation that is an organization related to Sin Cire Co., Ltd. YM, KY, HK, and AK are employees of Sin Cire Co., Ltd. They were involved in the development and implementation of exercise programs, but they were not involved in the research design, analysis, or reporting. TY, HS, and TH declare no conflicts of interest.