|（1.School of Physical Education，South China Normal University，Guangzhou 510006，China；2.Guangya Experimental School，Guangzhou 510176，China)
Abstract: The authors studied the physical development and physical health conditions of 2 306 elementary and mid-dle school students (aged 10-18) at 24 elementary and middle schools in Guangdong province. Test indexes include physical development, physical functions and physical qualities. The authors revealed the following findings: 1) the male students’ height had two quick increasing periods respectively at ages 11-14 and ages 17-18, while the female students’ height had one quick increasing period, which was earlier than the male students’; the weight of both the male and female students aged 10-13 had a quick increasing period; the male students’ body fat percentage showed a slowly increasing trend, while the female students’ increasing rate was significantly higher than the male students’; 2) the quick increasing period of the lung capacity of the male and female students occurred at ages 11-13, while their blood pressure changes indicated that blood vessel development and heart development were not synchronous; LDL-C showed “arch” characteristics, the “arc crown” occurred at age 15 or so; 3) both the male and female students’ strength quality showed a quick increasing trend at ages 12-14, the male students showed the second quick increasing period at ages 17-18; the male students’ speed development sensitive period was earlier and lasted longer than the female stu-dents’, both the male and female students’ endurance growth fell significantly behind their speed quality; the male and female students’ reaction capacity and flexibility developing and changing trends were basically synchronous, in which reaction capacity quick increasing period was ages 11-13, while flexibility quick increasing period was ages 13-16; 4) in recent years, the growth levels of the students in Guangdong increased significantly. As compared with the students at the same ages nationwide, the height, weight and BMI of the students in Guangdong were slightly lower, their lung capacity was higher, but their blood pressures, especially diastolic blood pressure, were higher; their speed quality and endurance quality were higher, while their strength quality and flexibility quality were lower.
Key words: school physical education；physical health；elementary and middle school students；Guangdong province