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The effect of geographical indices on left ventricular structure in healthy Han Chinese population

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Abstract

The left ventricular posterior wall thickness (LVPWT) and interventricular septum thickness (IVST) are generally regarded as the functional parts of the left ventricular (LV) structure. This paper aims to examine the effects of geographical indices on healthy Han adults’ LV structural indices and to offer a scientific basis for developing a unified standard for the reference values of adults’ LV structural indices in China. Fifteen terrain, climate, and soil indices were examined as geographical explanatory variables. Statistical analysis was performed using correlation analysis. Moreover, a back propagation neural network (BPNN) and a support vector regression (SVR) were applied to developing models to predict the values of two indices. After the prediction models were built, distribution maps were produced. The results show that LV structural indices are characteristically associated with latitude, longitude, altitude, average temperature, average wind velocity, topsoil sand fraction, topsoil silt fraction, topsoil organic carbon, and topsoil sodicity. The model test analyses show the BPNN model possesses better simulative and predictive ability in comparison with the SVR model. The distribution maps of the LV structural indices show that, in China, the values are higher in the west and lower in the east. These results demonstrate that the reference values of the adults’ LV structural indices will be different affected by different geographical environment. The reference values of LV structural indices in one region can be calculated by setting up a BPNN, which showed better applicability in this study. The distribution of the reference values of the LV structural indices can be seen clearly on the geographical distribution map.

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Acknowledgments

Project 40971060 supported by the National Nature Science Foundation of China and No. GK201504015 supported by Central College Fund.

Authors’ contributions

MYC performed the statistical analyses and acquired and interpreted the data. GM conceived of the study and carried out the design of the study. YLL, CXW, and SFY helped to revise the manuscript. All authors have read and approved the final manuscript.

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Authors and Affiliations

  1. College of Tourism and Environment, Shaanxi Normal University, Chang’an Road NO.620, Xi’an, 710119, China

    Minyi Cen, Miao Ge, Yonglin Liu & Shaofang Yang

  2. Department of Cardiovasology, the Second Affiliated Hospital, Medical School of Xi’an Jiaotong University, Xi’an, China

    Congxia Wang

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  1. Minyi Cen
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  2. Miao Ge
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  3. Yonglin Liu
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  4. Congxia Wang
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  5. Shaofang Yang
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Correspondence to Miao Ge.

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Cen, M., Ge, M., Liu, Y. et al. The effect of geographical indices on left ventricular structure in healthy Han Chinese population. Int J Biometeorol 61, 303–311 (2017). https://doi.org/10.1007/s00484-016-1212-1

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  • DOI: https://doi.org/10.1007/s00484-016-1212-1

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