Department of Ophthalmology, Odense University Hospital, Odense, Denmark.
Department of Clinical Research, Faculty of Health Sciences, University of Southern Denmark, Odense, Denmark.
Acta Ophthalmol. 2018 Mar;96(2):134-141. doi: 10.1111/aos.13513. Epub 2017 Jul 3.
To determine associations between physical activity (PA) and myopia in Danish school children and investigate the prevalence of myopia.
This is a prospective study with longitudinal data on PA in a Danish child cohort. Physical activity (PA) was measured objectively by repeated ActiGraph accelerometer measurement four times with different intervals (1-2.5 years) at the mean ages 9.7, 11.0, 12.9 and 15.4 years. Mean intensity of PA was estimated as counts/minutes, and time spent in sedentary, light, moderate and vigorous PA was summed using defined cut-off points. The ophthalmologic examination was conducted at the mean age of 15.4 ± 0.7 years and included cycloplegic autorefraction and biometry.
A total of 307 children participated in the Childhood Health, Activity, and Motor Performance School (CHAMPS) Eye Study. The cycloplegic spherical equivalent (SE) was 0.30 ± 1.46 dioptres. The prevalence of myopia was 17.9% (SE ≤-0.5 dioptres). Mean axial length (AL) was 23.5 ± 0.9 mm. For all participants, the overall mean daily distribution of PA was 67.2% in sedentary, 25.6% in light, 4.4% in moderate and 2.9% in vigorous PA. Age- and sex-adjusted linear regression showed no association between PA and SE or AL. In a prospective slope analysis, there was no association between accumulated PA during the 7 years and AL or SE.
The prevalence of myopia among Danish children was 17.9%. By logistic regression and slope analysis, we found no association between PA and myopia, in this first of its kind study based on objective and repeated PA data.
确定丹麦学龄儿童的身体活动（PA）与近视之间的关联，并调查近视的流行率。
这是一项前瞻性研究，对丹麦儿童队列进行了 PA 的纵向数据研究。PA 通过重复使用 ActiGraph 加速度计四次进行客观测量，测量间隔为 1-2.5 年，平均年龄为 9.7、11.0、12.9 和 15.4 岁。PA 的平均强度估计为每分钟计数，使用定义的截止值对久坐、低强度、中强度和高强度 PA 时间进行求和。眼科检查在平均年龄 15.4±0.7 岁进行，包括睫状肌麻痹自动折射和生物测量。
共有 307 名儿童参加了儿童健康、活动和运动表现学校（CHAMPS）眼部研究。睫状肌麻痹等效球镜（SE）为 0.30±1.46 屈光度。近视的患病率为 17.9%（SE≤-0.5 屈光度）。平均眼轴（AL）为 23.5±0.9mm。对于所有参与者，PA 的总体日平均分布为久坐 67.2%、低强度 25.6%、中强度 4.4%和高强度 2.9%。年龄和性别调整的线性回归显示，PA 与 SE 或 AL 之间无关联。在前瞻性斜率分析中，7 年内累计 PA 与 AL 或 SE 之间无关联。
丹麦儿童的近视患病率为 17.9%。通过逻辑回归和斜率分析，我们在这项基于客观和重复 PA 数据的首次研究中发现，PA 与近视之间没有关联。
