(1.School of Physical Education,Chongqing University,Chongqing 401331,China; 2.Department of Physical Education,Xiamen University of Technology,Xiamen 361024,China) Abstract: Based on the baseline data of China Education Tracking Survey (CEPS) from 2013 to 2014 and threshold regression model, this study analyzed the dose-effect relationship between extracurricular physical exercise and academic achievement of adolescents. The results show that: (1) extracurricular physical exercise had a significant promoting effect on teenagers’ academic achievement; (2) the dose-effect relationship of extracurricular physical exercise on teenagers’ academic achievement was nonlinear, and there was a significant threshold effect, showing an inverted U-shaped tendency; (3) the average 1.4 to 2 hours daily of extracurricular physical exercise can have the greatest effect on improving academic performance for teenagers; (4) the more academic stress the teenagers had, the more moderate extracurricular physical exercise they should keep every day. Keywords: school physical education;extracurricular physical exercise;academic achievement;threshold regression model;teenagers |