The L-shaped association between superoxide dismutase levels and blood pressure in older Chinese adults: community-based, cross-sectional study

As an antioxidant, serum superoxide dismutase (SOD) have been found to be associated with hypertension. The data were derived from the Chinese Longitudinal Healthy Longevity Survey (CLHLS), a prospective cohort study in China. We explored the association between serum SOD and blood pressure (BP) usi...

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Published in:Journal of geriatric cardiology : JGC 2022-01, Vol.19 (1), p.71-82
Main Authors: Huang, Ying, Lai, Wei, Chen, Hong, Liu, Qi-Fan, Li, Ju-Xiang, Hu, Jin-Zhu
Format: Article
Language:English
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Summary:As an antioxidant, serum superoxide dismutase (SOD) have been found to be associated with hypertension. The data were derived from the Chinese Longitudinal Healthy Longevity Survey (CLHLS), a prospective cohort study in China. We explored the association between serum SOD and blood pressure (BP) using multivariable correction analysis in an older Chinese population. We observed a significantly gradual downward trend in the association between serum SOD levels and diastolic BP (DBP) in participants with lower serum SOD levels (< 58 IU/mL), while no associations were observed between serum SOD levels and DBP in participants with higher serum SOD levels (> 58 IU/mL). Similar results showed a significant gradual downward trend in associations between serum SOD levels and the risk of diastolic hypertension only at SOD < 58 IU/mL. Multiple linear regression analysis suggested that serum SOD was negatively correlated with DBP (Sβ = -0.088, < 0.001) but not with SBP (Sβ = 0.013, = 0.607). Multiple logistic regression analysis suggested that serum SOD was independently associated with the risk of diastolic hypertension (OR = 0.984, 95% CI: 0.973-0.996, = 0.010) but not with the risk of systolic hypertension (OR = 1.001, 95% CI: 0.990-1.012, = 0.836)) after adjusting for relevant confounding factors. Serum SOD levels (< 58 IU/mL, > 58 IU/mL) were an effect modifier of the association between serum SOD and DBP (interaction = 0.0038) or the risk of diastolic hypertension (interaction = 0.0050). Our study indicated for the first time that there was an L-shaped association between serum SOD levels and the risk of diastolic hypertension in the older Chinese population.
ISSN:1671-5411
DOI:10.11909/j.issn.1671-5411.2022.01.002