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Background <p>Light at night (LAN) has been reported to be related to a variety of metabolic diseases, especially in adults. This study aimed to investigate the association between indoor LAN exposure and obesity-related parameters among children and adolescents, and to assess this association at different levels of physical activity.</p> Methods <p>From April to December 2024, LAN exposure was collected by a portable illuminance meter over one week on 628 children and adolescents aged 9–15 years in Shanghai. Obesity-related parameters were measured by body composition analyzer and professional technicians. Moderate-to-vigorous intensity physical activity (MVPA) was assessed using Children’ s Leisure Activities Study Survey-Chinese edition (CLASS-C).</p> Results <p>Median indoor LAN<sub>avg</sub> (average light intensity from bedtime to rising time) was 2.4&#xa0;lx, with 72.1% of participants experiencing an average exposure above 1&#xa0;lx. Median indoor LAN1 (duration of nighttime light intensity ≥ 1&#xa0;lx) was 36.1&#xa0;min. Each SD (12.3&#xa0;lx) increase of indoor LAN<sub>avg</sub> was associated with increase of 0.34 in BMI (95% <i>CI</i>: 0.07, 0.61), 0.49&#xa0;kg in FM (95% <i>CI</i>: 0.02, 0.96), 0.26&#xa0;kg in FMT (95% <i>CI</i>: 0.01, 0.52). Extended exposure to LAN ≥ 1&#xa0;lx by 67.0&#xa0;min/day (1 SD) was related to increase of 0.42 in BMI (95% <i>CI</i>: 0.15, 0.69), 0.59&#xa0;kg in FM (95% <i>CI</i>: 0.12, 1.06), 0.32&#xa0;kg in FMT (95% <i>CI</i>: 0.07, 0.58), and 0.72&#xa0;cm increase of WC (95% <i>CI</i>: 0.02, 1.43). LAN duration (LAN1) was significantly associated with obesity (<i>OR</i> = 1.27, 95% <i>CI</i>: 1.05, 1.53). When stratified by MVPA, associations between LAN exposure and obesity, FM, FMT, WC disappeared in participants with MVPA ≥ 1&#xa0;h/day. The correlation of lighter LAN<sub>avg</sub> (≥ 1&#xa0;lx ) with BMI, FM and FMT was positive in the level of MVPA &lt; 1&#xa0;h/day, but negative in level of MVPA ≥ 1&#xa0;h/day, although no statistical significance was found (<i>P</i> &gt; 0.05).</p> Conclusion <p>This population-based study provides indicates that indoor LAN is significantly related to obesity among children and adolescents. Longitudinal studies are required to confirm the potential moderating role of MVPA between LAN and obesity.</p>

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Association between indoor light at night and obesity among children and adolescents at different physical activity levels: a population-based cross-sectional study

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月30日

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  • Shuangxiao Qu,
  • Dongling Yang,
  • Keyang Zheng,
  • Shenglei Huang,
  • Yanting Yang,
  • Liting Chu,
  • Yuting Huang,
  • Fengyun Zhang,
  • Chunyan Luo

摘要

Background

Light at night (LAN) has been reported to be related to a variety of metabolic diseases, especially in adults. This study aimed to investigate the association between indoor LAN exposure and obesity-related parameters among children and adolescents, and to assess this association at different levels of physical activity.

Methods

From April to December 2024, LAN exposure was collected by a portable illuminance meter over one week on 628 children and adolescents aged 9–15 years in Shanghai. Obesity-related parameters were measured by body composition analyzer and professional technicians. Moderate-to-vigorous intensity physical activity (MVPA) was assessed using Children’ s Leisure Activities Study Survey-Chinese edition (CLASS-C).

Results

Median indoor LANavg (average light intensity from bedtime to rising time) was 2.4 lx, with 72.1% of participants experiencing an average exposure above 1 lx. Median indoor LAN1 (duration of nighttime light intensity ≥ 1 lx) was 36.1 min. Each SD (12.3 lx) increase of indoor LANavg was associated with increase of 0.34 in BMI (95% CI: 0.07, 0.61), 0.49 kg in FM (95% CI: 0.02, 0.96), 0.26 kg in FMT (95% CI: 0.01, 0.52). Extended exposure to LAN ≥ 1 lx by 67.0 min/day (1 SD) was related to increase of 0.42 in BMI (95% CI: 0.15, 0.69), 0.59 kg in FM (95% CI: 0.12, 1.06), 0.32 kg in FMT (95% CI: 0.07, 0.58), and 0.72 cm increase of WC (95% CI: 0.02, 1.43). LAN duration (LAN1) was significantly associated with obesity (OR = 1.27, 95% CI: 1.05, 1.53). When stratified by MVPA, associations between LAN exposure and obesity, FM, FMT, WC disappeared in participants with MVPA ≥ 1 h/day. The correlation of lighter LANavg (≥ 1 lx ) with BMI, FM and FMT was positive in the level of MVPA < 1 h/day, but negative in level of MVPA ≥ 1 h/day, although no statistical significance was found (P > 0.05).

Conclusion

This population-based study provides indicates that indoor LAN is significantly related to obesity among children and adolescents. Longitudinal studies are required to confirm the potential moderating role of MVPA between LAN and obesity.