부산대학교 도서관

Purpose: The purpose of this study is to investigate the effects of high-intensity circuit training (HICT) on the body composition, exercise performance, physical fitness benefits, sleep, and stress in the young generation. Methods: HICT training, guided by certificated trainer and mobile application (app), was implemented for eight weeks. This experiment was designed by random assignment and parallel design, and the physical fitness tests were applied to evaluate the effects of HICT. A total of 30 subjects with an average age of about 28 years and irregular exercise habits within three months were recruited for this study and were randomly divided into exercise intervention experimental group (n = 15) and control group (n = 15). The actual number of people who completed the eight weeks was 12 and 10 in experimental group and the control group, respectively. The correctness of the subjects' movements and proper app software operation were confirmed before the experiment, and then HICT was conducted for eight consecutive weeks with three times per day and two days per week and the maximum heart rate at 60%–85% was monitored and maintained by heart rate device. The physical fitness (2-minute push-up, 2-minute sit-up, agility T-test, and cardiorespiratory fitness), anthropometry (body composition, waistline, and hipline), and questionnaires were evaluated as dependent variables before and after HICT intervention. Results: After eight weeks of exercise intervention, the post-test of physical fitness and anthropometry in the experimental group significantly showed the improvement as compared to pre-test, but not in control group. Besides, the body fat, waistline, muscle mass, 2-minute push-up, 2-minute sit-up, standing long jump, and stress, also demonstrated the significantly higher improvement in experimental group than control group with eight weeks of exercise intervention. Conclusion: The app could effectively enhance the benefits of physical fitness and stress improvement and provide another form of exercise for home life with the Coronavirus Disease-2019 (COVID-19) epidemic impacts to achieve the health promotion effects.