| Research purpose:This study intends to conduct a joint intervention of exercise and diet for 8 weeks in a specific group of obese youth,and follow them up for 3 months.The changes of body weight,BMI and body self-esteem were analyzed before and after intervention.Differences in body weight,BMI and body self-esteem were compared after follow-up and after intervention.To explore the relationship between body weight and body self-esteem during intervention and follow-up.And further explore the main reasons for weight rebound after weight loss.Research methods:Based on the peak weight loss closed boot camp,simple obese students aged 20 to 29 who volunteered to participate in the study were selected.The students who could not complete the experiment due to extra feeding and sports injury were excluded,and 92 obese students(40 males and 52 females)were finally included,with an average age of 25.70±4.76 years old and a BMI of 34.83±7.584kg/m2.The study was mainly composed of two parts.The first part: subjects participated in an8-week intervention program of exercise combined with diet to reduce fat and weight,and their body weight,BMI and body self-esteem were measured before and after the intervention.Part two: after the intervention was discontinued,the subjects were followed up for 3 months to investigate their body weight,body self-esteem,physical activity,sitting time,and energy intake.Before intervention,human component analyzer and exercise load experiment were used to measure subjects' basal metabolic rate and target heart rate,and personalized exercise and diet plans were developed.Polar heart rate was used to measure exercise intensity.The study was tested three times: eight weeks of exercise,before,after and after the dietary intervention,and three months of follow-up.The differences between body weight and body self-esteem in gender and intervention time were compared by independent sample T test,paired T test and repeated measurement anova.The correlation coefficient and anova were used to analyze the relationship between body weight and body self-esteem.Using binary Logistic regression model,the causes of weight gain were discussed from three aspects: physical activity,sitting time and energy intake.Results:1)body weight and BMI showed significant differences in gender before and after intervention.Compared with women,men have a large weight base and a high degree of obesity.Before the intervention,there was no gender difference in the three dimensions of body self-worth,physical attraction and physical condition,and significant difference in athletic ability and physical quality(p < 0.05).The scores of men were generally higher than those of women.After intervention,there were differences in athletic ability(p < 0.05)and physical condition(p < 0.01),and males were superior to females.2)There were significant differences in body weight,BMI and self-esteem between the three groups before and after intervention.Compared with before intervention,the body weight,BMI and self-esteem were significantly lower after intervention and follow-up.Compared with the intervention,the body weight increased significantly after follow-up,and the total body self-esteem,body self-worth,physical condition and physical quality decreased significantly.3)after intervention,taking the quartile of the BMI change value as a factor and the change of body self-esteem as a dependent variable,the one-way variance was calculated and it was found that there was a significant correlation between the change of BMI and the change of body self-esteem.Compared with Q1 group,Q3 group had significant changes in body condition,physical quality,body attraction and total body self-esteem,and Q4 group had significant changes in body self-worth,physical quality,body attraction and total body self-esteem.Compared with Q2 group,Q3 group showed significant changes in total body self-esteem.It indicates that body self-esteem score changes significantly when BMI changes significantly.It also showed that body self-esteem scores were more likely to increase when BMI decreased by more than 5.99.After follow-up,the body self-worth score of the weight gain group was significantly lower than that of the weight loss group.4)After follow-up,the total dietary energy intake and protein intake were significantly less than before intervention,the nutrient intake gradually approached the national recommended value,and the sedentary time was significantly reduced,from 466.83 ± 178.878 min to 307.32 ± 111.603 min.5)After follow-up,the relative risk of weight gain was 6(3.193,4.897)in sitting time Q2(5-6h),9(1.598)in Q3(? 6h),compared with low-level sitting time Q1(<5H),5.691);compared with the low level of dietary energy intake Q1(< 25.55met-h /W),the relative risk of weight gain in the high level of energy intake Q3(?53.75met-h / W)was 1.168(0.983,1.389);compared with the low carbon water intake Q1(< 198.3g / D),the relative risk of weight gain in the high carbon water intake Q3(? 298.1g / D)was 1.010(1.000,1.420).Physical activity,intake of three nutrients and medium energy intake were not related to weight gain.Research conclusions:1)There were significant differences in body weight,BMI and body self-esteem before and after intervention(p < 0.01),and the test indicators were different in gender.There were significant differences in body weight,BMI,exercise ability and physical attractiveness after follow-up compared with before intervention.After the intervention,there were significant differences in body weight,body value and body condition.2)After intervention,the correlation coefficients between weight loss,BMI change and weight loss % and changes in body self-esteem were all significant(p <0.05).Among them,the correlation coefficient between BMI change and body self-esteem was higher.When BMI changed significantly,the body self-esteem score also changed significantly.After follow-up,body weight gain had a tendency to decrease the scores of individual dimensions of body self-esteem.3)compared with before intervention,total dietary intake,protein intake and sitting time were significantly reduced and total physical activity level increased after follow-up.4)the main reasons for weight gain after weight loss are long sitting time and excessive dietary energy intake. |
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