Trends in Physical Fitness Among 12-Year-Old Children in Urban and Rural Areas During the Social Transformation Period in China.

Aims: To investigate the 29-year (1985-2014) trends in body dimensions and physical fitness test performances among 12-year-old Chinese children living in urban and rural areas.

Methods: The data were from the findings of seven cross-sectional surveys from the Chinese National Survey on Students' Constitution and Health. In the seven surveys, there were 34,238; 11,664; 17,485; 18,057; 19,254; 17,962; and 17,906 children, respectively.