Effects Of Physical Activity Level,Body Fat Rate And Exercise Motivation On Delay Discounting In College Students

Objective:This study takes delay discount as a breakthrough point to explore the relationship between physical activity,body fat rate,exercise motivation and delay discount of college students,so as to comprehensively improve college students’sports participation and extracurricular exercise,promote their physical quality and physical health level,and provide scientific reference for the promotion of college students’physical health and the reform of college physical education.Methods:A total of 61 college students（30 males and 31 females）were recruited.The IPAQ Physical Activity Scale,BIS Impulsivity Scale,and SMS Exercise Motivation Scale are used to assess their physical activity level,impulsivity,and exercise motivation.The aerobic endurance of the subjects is measured by PWC₁₇₀ step test.The best exercise experience intensity of college students is explored through exercise running platform.E-prime3.0 software is used to measure the delay discount of subjects by matching and direct selection methods.Results:（1）In this study,the optimal exercise intensity is 87.72%±9.44%HRmax for boys and 71.30%±7.71%HRmax for girls.（2）In this study,the overall currency discount rate of college students is0.255%±0.28%;The delayed discount rate of food was 3.08%±6.73%;The discount rate of motor delay is 1.04%±1.57%.（3）There is no significant difference in body fat rate,impulsivity and currency delay discount rate among college students with different levels of physical activity（all P>0.05）.However,there are significant differences in the discount rates of aerobic endurance,exercise motivation,food and exercise delay discount rate（all P<0.01）.Through pairwise comparison,compared with the low physical activity group,the aerobic endurance of college students in the moderate physical activity group increases significantly（P<0.05）,exercise motivation increases significantly（P<0.01）,food delay discount rate decreases significantly（P<0.05）,and exercise delay discount rate decreases significantly（P<0.01）.Compared with the low physical activity level group,the aerobic endurance and exercise motivation of college students in the high physical activity level group increases significantly（P<0.01）,while the food delay discount rate and exercise delay discount rate decreases significantly（P<0.01）.（4）In this study,there is no correlation between body fat rate and exercise motivation,impulsivity,aerobic endurance,money and delayed discount rate（P>0.05）.There is a significant negative correlation between food delay discount rate（R²=0.07,P<0.05）and optimal exercise intensity（R²=0.23,P<0.01）.（5）In this study,there is no correlation between college students’exercise motivation and currency delay discount rate（P>0.05）.There is a significant negative correlation between exercise motivation and delayed food discount rate（R²=0.12,P<0.01）.There is a significant negative correlation between exercise motivation and motor delay discount rate（R²=0.09,P<0.05）.Conclusion:Scientific and reasonable sports can make college students feel happy and promote their participation in sports.High level of physical activity is beneficial to improve aerobic endurance and exercise motivation of college students.It may improve self-control over food and exercise;reducing body fat rate in overweight and obese college students may improve their food self-control.In addition,improving college students’exercise motivation may be beneficial to improve their food self-control,increase the pleasure of exercise and promote exercise participation.