소위영1,최대혁1, 윤용진2

서강대학교1, 연세대학교2

Background : The rapid change in the social environment by the popularization of instant food, motorized vehicles, and the internet is threatening the health and fitness of adolescents. In particular, inactivity related to stress, schoolwork, and the university entrance exam results in bigger build but lower fitness as they enter their twenties. Circuit weight training is one type of exercise that maximizes the aerobic and anaerobic capacities. Though there are numerous studies from and outside Korea involving athletes, none studied subjects in their twenties. Perhaps, it was thought unnecessary to study the effects of training on persons in their twenties as this is one of the strongest periods in a person's life. This study is a well-controlled and quantitative study to show that weight training does affect this age group. Methods : Subjects included 36 adult males in their early- to mid-twenties who were students in S University exercise program at M-gu in S city. They were divided into exercise group (N=23) and control group (N=13). Circuit weight training was scheduled twice a week for 14 weeks. Body composition (weight, BMI (body mass index), and % body fat), cardiorespiratory function (SBP: systolic blood pressure, DBP: diastolic blood pressure), RHR (resting heart rate), RC (respiratory capacity), fitness (VO2max, sit-up, grip strength, sit and reach, vertical jump, reaction time, and balance), depression, self-esteem, and 36-item short form health survey were measured before and after this period of training. Results : There was a borderline level of significant difference before and after the 14 weeks of circuit weight training in % body fat (F=3.594, p=0.067), and there were significant differences in weight (F=4.444, p=0.042) and BMI (F=4.614, p=0.039). There were no significant differences in SBP (F=1.050, p=0.313), DBP (F=0.073, p=0.788), and RHR (F=0.604, p=0.442) under cardiorespiratory function, but there was a significant difference in RC (F=8.640, p=0.006). There were significant differences in all fitness variables- VO2max (F=4.921, p=0.033), sit-up (F=22.822, p<0.001), grip strength (F=6.880, p=0.013), sit and reach (F=6.743, p=0.014), vertical jump (F=18.381, p<0.001), reaction time (F=5.405, p=0.026), and balance (F=6.439, p=0.016). There was no significant difference in depression (F=0.037, p=0.848), but there was a significant difference in self-esteem (F=4.268, p=0.047). There were no significant differences in any of the SF-36 variables- physical functioning (F=1.784, p=0.191), role limitation-physical (F=0.030, p=0.864), role limitation-emotional (F=0.136, p=0.715), social functioning (F=0.271, p=0.606), mental health (F=1.424, p=0.241), vitality (F=0.611, p=0.440), bodily pain (F=0.899, p=0.350), and general health (F=0.855, p=0.362). Conclusions : For adults in their twenties, circuit weight training has little effect on psychological improvement, but a significant positive effect on body composition, cardiorespiratory function, and fitness. (
Korean J Health Promot Dis Prev 2009;9(4):321-328) Key words : circuit weight training, body composition, cardiorespiratory function, fitness, depression, self-esteem, 36-item short form health survey (SF-36)