Effectiveness of a school-based comprehensive intervention on abnormal body posture of adolescents / 中国学校卫生

Objective@#The purpose of this study is to explore a school-based comprehensive intervention for abnormal body posture in adolescents.@*Methods@#The study recruited from 3 senior high schools in Xicheng District of Beijing using random clustering method and randomly divided them into intervention group (n=213) and control group (n=227). The intervention group adopted a comprehensive intervention program for 16 weeks, while the control group maintained normal teaching plan. The comprehensive intervention included distributing booklet regarding body posture, health lectures and corrective exercise in physical classes. Before and after the intervention, forward head posture, shoulder asymmetry, rounded shoulder and sagittal angles of spine of subjects were evaluated.@*Results@#After 16 weeks intervention, shoulder asymmetry [boys(0.98±0.52)(0.70±0.44)cm; girls(1.00±0.67)(0.72±0.44)cm], forward head posture [boys(8.24±2.71)(4.73±2.99)cm; girls(9.14±2.56)(4.39±2.34)cm] and the differences of distance between left and right inferior angel of scapula and spine [boys(0.41±0.39)(0.28±0.30)cm; girls(0.52±0.38)(0.28±0.19)cm] of the intervention group were significantly improved(t=2.33, 3.07, 9.80, 11.51, 2.36, 4.61, P<0.05). The proportion of normal thoracic kyphosis angle and lumbar lordosis angle increased in girls of intervention group (63.4%, 95.7%), while these proportion decreased in boys of intervention group (74.2%, 65.0%).@*Conclusion@#School-based intervention including health education and exercise shows effectiveness on abnormal body posture in adolescents, which is recommended school.

Physiological load of physical education class of high schools in Xicheng District of Beijing / 中国学校卫生

Objective@#To evaluate physical load of different sports and in various forms of physical education class.@*Methods@#117 healthy adolescents (57 girls and 60 boys) were recruited from 6 high schools in Xicheng District of Beijing (2 high schools of type 1, 2 of type 2, and 2 of type 3), and each 10 students were randomly selected from grade 1 and 2 in the high school. Polar Team 2 was used to measure physiological load in martial arts, throwing, jumping and basketball, and 639 persontime eligible data were collected.@*Result@#In martial arts and high jump class, duration of heart rate response (HRmax) below 60% in the new classes were significantly longer, while duration of moderatetovigorous physical activity (MVPA) was shorter than comprehensive courses and review courses(P<0.05). Students spent about an average of 24.6 (9-34) minutes in activities of HRmax below 60% in P.E.class, accounting for 54.7% of P.E. class time, an average of 17.3 (7-26) minutes in activities of HRmax between 60%-80%, accounting for 38.4% of P.E. class time, and an average of 3.5 (0-20) minutes in activities of HRmax higher than 80%, accounting for 6.9% of P. E. class time.@*Conclusion@#This physical load cannot achieve the goal of improving adolescents’ physical fitness. Government should strengthen the continuing education of PE teachers and update their knowledge constantly, in order to maximize the physical education benefit for adolescents.