China record: men's 400m, 45s 14, created by Guo Zhongze at the 13th National Games in Tianjin, China on September 3rd, 20th17; Women's 400m, 49 seconds 8 1, Ma1September 993 1 1 created by the 7th National Games in Beijing, China.

Features of the 400-meter event:

400 meters is an anoxic event, which means that the oxygen intake is lower than the demand for ATP (adenosine triphosphate). The energy of 400 meters running comes from the depletion of high-energy phosphate and the decomposition of glycogen into lactic acid.

This movement basically depends on two anaerobic systems-adenosine triphosphate system and lactic acid system. So far, physiologists have not found a way to measure anaerobic capacity, and it is difficult to know whether anaerobic storage is increasing or decreasing. We can only know the types of athletes' tension through the fatigue components detected by physiologists in the 400-meter race.