Physical and psychological effects of aerobic exercise in delinquent adolescent males. Influence of aerobic exercise training and relaxation training on physical and psychologic health following stressful life events. Improving physical fitness and emotional well-being in adolescents of low socioeconomic status in Chile: results of a school-based controlled trial. Influence of aerobic exercise on depression.
Aerobic exercise has been associated with improved psychological status and physical fitness in adults, but its effects in adolescents have been less clear. This study evaluated the effects of aerobic exercise on the self-concept, depression level, and physical fitness of juvenile delinquents. Ninety-eight incarcerated youths who volunteered to participate were assigned in a blind fashion to one of two exercise programs lasting three months. Sixty-nine completed all phases of the study and are the subjects of this report. One exercise program (32 subjects) emphasized aerobic exercise; the other (37 subjects), limited exertion. Before and after participating, each subject underwent measurement of self-concept, mood, and physical fitness. While the aerobic and comparison groups were initially similar, the data demonstrated an association between participation in the aerobic exercise program and improved self-concept, mood, and fitness. Improvement in psychological variables was not dependent on improved physical fitness and was not related to preintervention measures. An experiment was conducted to determine whether aerobic exercise training or relaxation training would be effective for reducing the deleterious effects of life stress on physical and psychologic health. Over 1000 college students were surveyed, and 55 of those who reported experiencing a high number of negative life events over the preceding year were assigned to an aerobic exercise training condition, a relaxation training condition, or a no-treatment control condition. Physical and psychologic health were assessed with self-report measures before, halfway through, immediately following, and 8 weeks after the 11-week training (and control) period. Heart rate data collected during a treadmill test indicated that the aerobic exercise training was effective for improving cardiovascular fitness. Psychologic measures indicated that the exercise training condition was more effective than the other two conditions for reducing depression during the first 5 weeks of training. No differences were found among the conditions on self-report measures of physical health. These findings suggest that aerobic exercise training may be useful for reducing the severity and duration of depressive reactions following stressful life change. Regular physical activity is associated with a reduced risk of all-cause mortality, and mortality due to cardiovascular disease and cancer. Among adolescents, physical activity is associated with benefits in the prevention and control of emotional distress, and improvement of self-esteem. Countries in transitional epidemiological scenarios, such as Chile, need to develop effective strategies to improve physical activity as a way to face the epidemic of chronic diseases. The objective of this study was to evaluate the effects of a school-based physical activity program on physical fitness and mental health status of adolescents living in a low socioeconomic status area in Santiago, Chile. A quasi-experimental design was used to evaluate the effects of the program over one academic year. The study included 198 students aged 15 years old. Two ninth grade classes were randomly selected as the intervention group, with two classes of the same grade as controls. A social planning approach was used to develop the intervention. The program was designed and implemented based on student preferences, teachers' expertise and local resources. Changes in physiological and mental health status were assessed. After the intervention, maximum oxygen capacity achieved a significant increase of 8.5% in the intervention versus 1.8% in the control group (p < 0.0001). Speed and jump performance scores improved significantly more in the intervention versus the control group (p > 0.01). Anxiety score decreased 13.7% in the intervention group versus 2.8% in the control group (p < 0.01), and self-esteem score increased 2.3% in the intervention group and decreased 0.1% in the control group after the end of the program (p < 0.0001). No significant change was observed in the depressive score. Student participation and compliance with the program was > 80%. To conclude, a school-based program to improve physical activity in adolescents of low socioeconomic status, obtained a high level of participation and achieved significant benefits in terms of physical fitness and mental health status. Forty-three depressed women were randomly assigned to either (a) an aerobic exercise treatment condition in which they participated in strenuous exercise, (b) a placebo treatment condition in which they practiced relaxation exercises, or (c) a no-treatment condition. Aerobic capacity was assessed before and after the 10-week treatment period. Self-reported depression was assessed before, during, and after the treatment period. The results indicated that subjects in the aerobic exercise condition evidenced reliably greater improvements in aerobic capacity than did the subjects in either of the other conditions (p less than .002 in both cases) and that the subjects in the aerobic exercise condition evidenced reliably greater decreases in depression than did subjects in the placebo condition (p = .05) or subjects in the no-treatment condition (p = .001). These results provide the first controlled evidence concerning the effects of strenuous exercise on depression.
Whilst there appears to be a small effect in favour of exercise in reducing depression and anxiety scores in the general population of children and adolescents, the small number of studies included and the clinical diversity of participants, interventions and methods of measurement limit the ability to draw conclusions. It makes little difference whether the exercise is of high or low intensity. The effect of exercise for children in treatment for anxiety and depression is unknown as the evidence base is scarce.