Association between bedroom light exposure at night and allostatic load among Chinese young adults

Jun 25, 2022Environmental pollution (Barking, Essex : 1987)

Nighttime bedroom light exposure linked to stress-related health risks in Chinese young adults

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Abstract

The mean allostatic load score for individuals exposed to bedroom light at night (average intensity ≥ 3 lx) was 3.6, significantly higher than the score of those in dim conditions (2.7).

In a cohort of 484 Chinese young adults aged 16-22, bedroom light exposure may be linked to increased allostatic load, which reflects stress on multiple body systems.
For each 1 lx increase in bedroom light intensity, there was an associated 0.15-unit increase in allostatic load score.
Individuals in the LAN group showed an increase of 1.01 units in allostatic load score compared to those in the Dim group.
Significant associations between bedroom light exposure and allostatic load parameters were observed, indicating potential health risks.
Maintaining darkness in the bedroom at night could be a feasible approach to mitigate stress on the body and enhance health.

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Light at night (LAN) has received increasing attention for its potential health hazards to human and animals. However, to our knowledge, no study has explored the specific effects of bedroom nighttime light exposure on allostatic load (AL). To investigate the association between bedroom individual-level LAN exposure and AL among young adults, an integrative index manifests multiple system dysregulation. Using data from a cohort of 484 Chinese young adults aged 16-22 years. Bedroom light was objectively recorded at 1-min intervals for two nights using a portable illuminance meter. Fasting blood samples were collected at one-year follow-up for the detection of AL parameters. AL score was derived as sum of the top quartile of twelve physiological biomarkers in four systems: metabolic system (BMI, WC, TC, HDL, LDL, TG, HbA1c, INS, GLU); cardiovascular system (SBP, DBP); immune and inflammatory systems (hs-CRP), with HDL was lowest quartile. Univariate and multivariate linear regression models were used to evaluate the association between LAN intensity with AL score and separate AL parameters. The average age of subjects was 18.7 years, 64.3% were female. The mean AL score of LAN group (average LAN intensity ≥ 3lx) was significantly higher than Dim group (3.6 ± 2.6 vs. 2.7 ± 2.1; P = 0.007). For each 1 lx increase of LAN intensity was associated with 0.15-unit increase in AL score (95% CI: 0.06, 0.24; P = 0.001). Moreover, LAN group was associated with increased 1.01-unit in AL score (95% CI: 0.36-1.66; P = 0.003) compared to Dim group. Significant associations between bedroom LAN exposure with allostatic load and separate AL biomarkers were observed in our study. Keeping bedroom darkness at night may be a practicable option to reduce the wear of multiple body systems and improve human cardiometabolic health from early in life.

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Association between bedroom light exposure at night and allostatic load among Chinese young adults

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