Abstract
The adverse impacts of lead and cadmium exposure on health outcomes have been reported in the past. Few studies have been conducted on the relationship between lead and cadmium exposures and disability. We evaluated whether lead and cadmium exposures were associated with functional dependence including the total number of disabilities, activities of daily living (ADL), instrumental activities of daily living (IADL), leisure and social activities (LSA), lower extremity mobility (LEM), and general physical activities (GPA) in an elderly population. A total of 5513 eligible subjects were enrolled in the study from the National Health and Nutrition Examination Survey 2001–2006. Serum lead and cadmium exposure assessments were performed using atomic absorption spectrometry. Functional dependence was assessed by 19 structured questions. The relationships between lead and cadmium exposures and functional dependence were investigated using by multivariable linear regression models. Q2, Q3, and Q4 of lead exposure were significantly associated with the total number of disabilities, with β coefficients of − 0.62 (95% CI − 0.99, − 0.24), − 0.64 (95% CI − 1.02, − 0.26), and − 0.81 (95% CI − 1.19, − 0.42), respectively. This relationship remained significant in males. Furthermore, we analyzed the relationships between lead and cadmium exposure quartiles and various functional dependence metrics, and we determined that lead content was significantly associated with decreased ADL, LEM, and GPA (p < 0.05) and cadmium content was inversely associated with ADL (p < 0.05). Our study demonstrated a strong relationship between exposure to lead and cadmium and functional dependence in an elderly population.
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Yuan-Yuei Chen contributed to the design of the study, was responsible for the management and retrieval of data, contributed to initial data analysis and interpretation, and drafted the initial manuscript. Yuan-Yuei Chen, Chung-Ching Wang, Tung-Wei Kao, Chen-Jung Wu, Ying-Jen Chen, Ching-Huang Lai, Yi-Chao Zhou, and Wei-Liang Chen decided upon the data collection methods. Yuan-Yuei Chen and Wei-Liang Chen were also responsible for the data analysis decisions. Wei-Liang Chen conceptualized and designed the study, supervised all aspects of the study, critically reviewed and revised the manuscript, and approved the final manuscript as submitted. All authors meet the ICMJE criteria for authorship.
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Chen, YY., Wang, CC., Kao, TW. et al. The relationship between lead and cadmium levels and functional dependence among elderly participants. Environ Sci Pollut Res 27, 5932–5940 (2020). https://doi.org/10.1007/s11356-019-07381-3
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DOI: https://doi.org/10.1007/s11356-019-07381-3