Sports and Healthy China
CHENG Meichao, ZHANG Ruilin
Objective: To systematically evaluate the intervention effect and optimal dose of different exercise methods on myopia in children and adolescents. Methods: 32 studies (n=8 804) were included by searching PubMed, Web of Science and other databases, and network meta-analysis was performed using RevMan5.3 and Stata16.0. Results: 1) Effects on visual acuity improvement: the static visual acuity was best in outdoor sports (98.7%), followed by dancing (53.2%), sports games (41.2%), ball games (25.0%) and combined intervention (6.5%). Ball games (85.5%) and outdoor sports (85.4%) had similar effects on improvement of dynamic visual acuity. Outdoor sports (81.0%) were superior to ball games (72.6%) in terms of ocular axis regulation. 2) Dose effect: The lowest effective dose was 2~3 times per week[SMD=0.23,95%CI(0.15,0.30)], single 30 to 40 minutes per session[SMD=0.01,95%CI(0.08,0.10)], and lasted for 6~12 weeks[SMD=0.04,95%CI(0.03,0.11)]; Best sports dose was for 6~7 times a week[SMD=0.56, 95%CI(0.33,0.78)], 41~60 minutes per session[SMD=0.26,95%CI(0.21,0.32)], and lasted for 21~36 weeks[SMD=0.40,95%CI(0.24,0.56)]. Conclusion: Dancing, sports games, ball games, outdoor sports and combined intervention can effectively improve the myopia of children and adolescents, among which outdoor sports and ball games have the best effects. It is recommended that children and adolescents give priority to these two types of exercise, carry out exercise at least 2~3 times a week, 30 to 40 minutes each time, and last for 6 to 12 weeks; Increasing the duration or frequency according to individual situations can further enhance the effect of myopia improvement.