Department of Maternal, Child and Adolescent Health, School of Public Health, Anhui Medical University, Hefei, Anhui, China.
School of Public Health, Anhui Medical University, Hefei, Anhui, China.
Environ Pollut. 2022 Nov 15;313:120117. doi: 10.1016/j.envpol.2022.120117. Epub 2022 Sep 7.
Excessive exposure to light at night (LAN) has become a serious public health concern. However, little is known about the impact of indoor LAN exposure on blood pressure, particularly among young adults. We aimed to investigate the effects of bedroom individual-level LAN exposure in real-world environment on blood pressure and hypertension among vulnerable young adults, and to evaluate the possible buffering effect of physical activity. In this cross-sectional study, a total of 400 healthy young adults aged 16-22 years were included. Bedroom LAN exposure was recorded at 1-min intervals for two consecutive nights using a TES-1339 R illuminance meter. Blood pressure was measured three times (8-11 a.m. in the physical examination day) in the seated position using an Omron HEM-7121 digital sphygmomanometer. A wrist-worn triaxial accelerometer (ActiGraph GT3X-BT) was used to assess physical activity for seven consecutive days. Each 1 lx increase of bedroom LAN intensity was associated with 0.55 mmHg-increase in SBP (95% CI: 0.15, 0.95), 0.30 mmHg-increase in DBP (95% CI: 0.06, 0.54), and 0.38 mmHg-increase in MAP (95% CI: 0.12, 0.65). Higher levels of LAN exposure were associated with increased risk of hypertension (LAN ≥ 3lx vs. LAN < 3lx: OR = 3.30, 95%CI = 1.19-9.19; LAN ≥ 5lx vs. LAN < 5lx: OR = 3.87, 95%CI = 1.37-10.98). However, these detrimental effects of bedroom LAN exposure on blood pressure and hypertension were not observed among young adults with high MVPA (≥2 h/day) level. MVPA can alleviate negative effects of bedroom LAN exposure on blood pressure and hypertension. Maintaining bedroom settings darkness at night may be an important strategy for reducing the risk of hypertension. Furthermore, for individuals living with high levels of indoor LAN exposure, regular physical activity may be a good option for preventing cardiovascular disease and hypertension.
夜间过度暴露于光线下（LAN）已成为严重的公共卫生问题。然而，人们对室内 LAN 暴露对血压的影响知之甚少，尤其是在年轻人中。我们旨在研究真实环境中卧室个体 LAN 暴露对脆弱的年轻成年人血压和高血压的影响，并评估身体活动的可能缓冲作用。在这项横断面研究中，共纳入了 400 名年龄在 16-22 岁的健康年轻成年人。使用 TES-1339 R 照度计以 1 分钟的间隔记录两个连续晚上的卧室 LAN 暴露情况。使用欧姆龙 HEM-7121 数字血压计在体检日的 8-11 点在坐姿下测量三次血压。使用三轴加速度计（ActiGraph GT3X-BT）连续七天评估身体活动。卧室 LAN 强度每增加 1 lx，SBP 增加 0.55mmHg（95%CI：0.15，0.95），DBP 增加 0.30mmHg（95%CI：0.06，0.54），MAP 增加 0.38mmHg（95%CI：0.12，0.65）。较高的 LAN 暴露水平与高血压风险增加相关（LAN≥3lx 与 LAN<3lx：OR=3.30，95%CI=1.19-9.19；LAN≥5lx 与 LAN<5lx：OR=3.87，95%CI=1.37-10.98）。然而，在身体活动量较高（≥2 小时/天）的年轻成年人中，并未观察到卧室 LAN 暴露对血压和高血压的这些不利影响。身体活动可以减轻卧室 LAN 暴露对血压和高血压的负面影响。保持夜间卧室环境黑暗可能是降低高血压风险的重要策略。此外，对于生活在室内 LAN 暴露水平较高的个体，定期进行身体活动可能是预防心血管疾病和高血压的一个不错的选择。
