Objective:To compare the effect of high-intensity interval training (HIIT) and moderate-intensity continuous training (MICT) on the abdominal visceral fat of obese women.Methods:Sixty-eight obese female college students were randomly divided into an HIIT group ( n=23), an MICT group ( n=22) and a control group ( n=23). The control group was not given any training intervention. The MICT group performed continuous exercise at an intensity of 60% of each person′s maximum oxygen uptake (VO 2max) until 300kJ of work had been performed. Those in the HIIT group performed repeated 4-minute bouts of cycling at 90% of their VO 2max with 3-minute intervals until 300kJ of work had been performed. The interventions lasted 12 weeks. The subjects′ visceral fat (AVFA) and abdominal subcutaneous fat (ASFA) were measured using computed tomography. Whole-body fat mass (FM) and FM in the android, gynoid and trunk regions were detected using dual energy X-ray absorptiometry before and 48 hours after the final session. Results:After the intervention, the average AVFA, ASFA, percentage of fat mass (FM%), whole-body FM, and FM in the abdominal, gluteo-femoral and trunk regions of the HIIT group and MICT group were significantly lower than before the intervention, but there was no significant difference between them. No significant differences were observed in any of the control group′s indexes.Conclusions:Both HIIT and MICT can reduce the abdominal visceral fat of obese female college students, and the effects of the two exercise modes are equivalent.

Objective: To investigate the effect of a 12-week circuit training program on health-related physical fitness and metabolic syndrome risk factors in obese female college students,and to provide reference for targeted interventions. Methods: Sixty subjects with body mass index (BMI) over 28 kg/m2 were randomly allocated to control group ( n =30) or exercise group( n =30). Participants of control group maintained daily lifestyle while those of exercise group performed circuit training program 3 times per week for 12 weeks. Parameter of body composition (including back strength, sit-up, sit-and-reach, and 1 600 m running time), health-related physical fitness (including body height, body weight, BMI), percentage of body fat (PBF) and lean body mass (LBM) and metabolic syndrome risk factors [including waist circumference(WC), fasting blood glucose(FBG), triglyceride(TG), total cholesterol(TC), highdensity lipoprotein cholesterol (HDL-C) and low-density lipoprotein cholesterol (LDL-C)] were tested before and after the experiment. Results: After intervention, body weight, BMI, PBF decreased, back strength, sit-up, sit-and-reach, and 1 600 m running time performance increased( t =2.14, 2.21, 2.48, -7.21, -7.69, -7.01, 4.83, P <0.05), WC, TG, TC reduced in exercise group compared with pre-test( t =2.89，4.54，2.71， P <0.05), whereas all parameters in control group showed no significantly different( P >0.05). Conclusion Regular circuit training improved body composition, enhanced physical fitness and may contribute to prevent metabolic diseases.

Objective: The aim of this study was to investigate the effects of smoking and aerobic exercise on metabolic syndrome risk factors among male college students. Methods: Eighty male college students were randomly selected from Global Youth Tobacco Survey and assigned to exercise smoker(ES), non-exercise smoker(NES), exercise non-smoker(ENS) and non-exercise nonsmoker (NENS) groups with sample size of 20 in each group. Subjects in NES and NENS groups maintained daily lifestyle while those in ES and ENS group performed aerobic exercise 5 times per week for 8 weeks with exercise intensity set at 50%~80% of heart rate reserve. Before and after experiment, risk factors for metabolic syndrome were assessed including systolic blood pressure (SBP), diastolic blood pressure (DBP), waist circumference (WC), fasting plasma glucose (FPG), triglyceride (TG) and high-density lipoprotein cholesterol (HDL-C). Results: After experiment, compared with ENS and NENS group, WC, SBP, DBP, FPG and TG increased while HDL-C decreased (P<0.05) in ES and NES groups. Compared with pre-experiment, SBP and DBP significantly decreased in ENS group(P<0.05), increased in NES group (P<0.05) while no statistically significant in ES and NENS group(P>0.05); WC was significantly reduced in both ES and ENS groups(P<0.05), increased in NES group (P<0.05) while no statistically significant in NENS group (P>0.05) after experiment. Compared with NES and NENS groups, △WC in ES and ENS group decreased (P<0.05); compared with other groups, △SBP and △DBP increased in NES groups while decreased(P<0.05) in ENS group. Conclusion Smoking is associated with higher level of metabolic syndrome risk factors, while aerobic exercise is associated with lowering blood pressure and WC level in male college students.

Objective: To compare the effectiveness of three forms of health education including classroom teaching, network teaching and after class tutoring on exercise behavior among college students. Methods: A literature search was performed using web of science, PubMed, ScienceDirect, Scopus, Cochrane Library, and CNKI database on randomized controlled trials of health education intervention on exercise behavior among college students. Literature filtering, data extraction, and assessment of the risks of bias were conducted by two independent researchers using Stata 16.0 software based on traditional Meta analysis and network meta analysis. Results: A total of 23 literatures were included. The results showed that health education courses could effectively increase the weekly exercise time of college students( SMD =0.29), exercise frequency ( SMD =0.25) and number of students participating in exercise( OR =1.33). Subgroup analysis revealed that the increase in classroom teaching and network teaching associated with increased weekly exercise time ( SMD =0.45, 0.36), exercise frequency ( SMD =0.22, 0.37) and exercise number ( OR =1.36, 1.26)(all P <0.05); The effect of after class tutoring on the time and frequency of weekly exercise was not statistically significant( P >0.05). Indirect comparison showed that the effects of classroom teaching and network teaching on weekly exercise time, and exercise frequency were superior to that of extracurricular counselling( P <0.05); There were no significant differences in the weekly exercise time, frequency and number of participants between the two groups( P >0.05). Based on SUCRA method and the effect size, health education in the form of classroom teaching may have the greatest effect on the weekly exercise time, frequency and the number of students participating in the exercise( SUCRA =91.5, 94.1, 87.1). Conclusion Health education in the form of classroom teaching and network teaching can positively influence exercise behavior of college students.It is suggested that health education courses should be carried out in college courses so as to better promote college students to participate in physical exercise.

Objective: In this study, a meta analysis was conducted to evaluate and compare the effects of different types of interval training, such as, repeated sprint training(RST), high intensity interval training(HIIT) and sprint interval training(SIT) on body index of overweight/obese college students and the effect of moderate intensity continuous training(MICT), so as to provide a reference for taking appropriate exercise measures. Methods: The data was searched and selected from the database of Web of Science, PubMed, Scopus, The Cochrane Library and CNKI, and from the articles about random research on the effects of HIIT, SIT, RST, and MICT on overweight/obese college students for the evaluation of bias risk. And Stata 16.0 software was used for Meta analysis and network analysis. Results: Totally 815 samples selected from 18 articles were included in the study. Meta analysis showed that HIIT( SMD=-0.26, 95%CI =-0.52--0.00, P <0.05) and SIT( SMD=-0.39, 95%CI =-0.72--0.07, P <0.05) could make greater effects on BMI than MICT. The differences between RST and MICT were of no statistical significance( SMD=0.28, 95%CI =0.32-0.87, P >0.05). According to the SUCRA method combined with effect size, the best effect on improving MetS related physiological indexes of overweight college students was found in SIT( SUCRA =79.3), followed by HIIT( SUCRA =78.2), RST( SUCRA =56.8), and MICT( SUCRA =35.7). Conclusion Compared with MICT, high intensity interval training can greatly improve BMI of the obese/overweight college students, and could achieve the optimal effect of reducing the fat by exercising through SIT.

Objective: To compare the effects of different types of high-intensity interval training and moderate-intensity steady training on improving cardiorespiratory fitness of college students, and to provide evidence supporting intervention methods for health promotion of college students. Methods: By using the method of Meta-analysis, Web of science, PubMed, Scopus and CNKI database was searched for randomized control trails regarding high-intensity intervention (HIIT), repeated-sprint training (RST) and sprint-interval training (SIT) among sedentary college students in April 1, 2020. Two independent researchers conducted literature filtering, data extraction, risk of bias assessment, as well as traditional Meta-analysis and network Meta-analysis by using Stata software version 16.0. Results: A total of 21 articles and 728 participants were included. Meta-analysis showed that HIIT (SMD=0.35, 95%CI=0.10-0.60, P<0.05) and SIT (SMD=0.38, 95%CI=0.05-0.70, P<0.05) were significantly better than MICT, there was no statistical difference in RST (SMD=-0.08, 95%CI=-0.41-0.25, P>0.05) compared with MICT; HIIT (SMD=0.40, 95%CI=0.08-0.72, P<0.05) and SIT (SMD=0.35, 95%CI=0.03-0.67, P<0.05) were significantly better than RST, there was no significant difference between HIIT and SIT(SMD=0.05, 95%CI=-0.25-0.36, P>0.05). The ranking of the four training methods for improving the effect size of VO 2max index was HIIT>SIT>RST>MICT. Conclusion The overall effect of high intensity interval training on VO 2max is better than MICT, and HIIT training may be the best.