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112. Association Between Nocturnal Sleep Duration and Obesity Indicators Among People with Type 2 Diabetes: A Cross-Sectional Study in Ningbo, China.

Author

Xu, M, Chattopadhyay, K, Qian, X, Li, J, Li, X, Sun, J, Li, L, Xu, M, Chattopadhyay, K, Qian, X, Li, J, Li, X, Sun, J, and Li, L

Abstract

AIM: The study aimed to investigate the association between the nocturnal sleep duration and five obesity indicators, namely, visceral fat area (VFA), subcutaneous fat area (SFA), bodyweight, body mass index (BMI) and waist circumference (WC), among people with type 2 diabetes mellitus (T2DM) in Ningbo, China. METHODS: A cross-sectional study was conducted using the National Metabolic Management Centre (MMC) - Ningbo First Hospital data from 1st March 2018 to 28th February 2021. Adults with T2DM were included in the study. Simple and multiple (adjusted for sociodemographic and lifestyle factors and health conditions) linear regression analyses were performed to identify the associations. RESULTS: In terms of VFA, SFA, bodyweight, BMI and WC, the eligibility criteria were satisfied by 2771, 2771, 2863, 2863 and 2862 patients, respectively. In the unadjusted model, the shorter nocturnal sleep duration was associated with higher VFA, SFA, bodyweight, BMI and WC. In other words, an hour increase in the nocturnal sleep duration was associated with a decrease of 2.07 cm2 in VFA (regression coefficient = -2.07; 95% CI = -3.25 to -0.88), 2.67 cm2 in SFA (-2.67; -4.55 to -0.78); 0.82 kg in bodyweight (-0.82; -1.2 to -0.43), 0.2 kg/m2 in BMI (-0.2; -0.31 to -0.09) and 0.46 cm in WC (-0.46; -0.76 to -0.16). In the adjusted models, the shorter nocturnal sleep duration was still found to be associated with higher VFA, SFA, bodyweight, BMI and WC (except SFA and WC in models where we further adjusted for health conditions). CONCLUSION: The nocturnal sleep duration among people with T2DM in Ningbo, China is negatively associated with visceral and general obesity indicators (VFA, bodyweight and BMI). Thus, there is a need for appropriate interventions to address the issue of sleep deprivation.

Published
2022

132. High Temperature Dry Sliding Reciprocating Wear Behavior of Centrifugally Cast A356-Mg2Si In-Situ Functionally Graded Composites.

Author

Ram, S. C., Chattopadhyay, K., and Bhushan, Awani

Abstract

In this study, the Al-Mg2Si FG-composites were developed by in-situ centrifugal casting route with varied Mg contents (2.5, 5.0, 7.5, and 10.0 wt.% Mg). Cast FG-composites subjected to T6 heat treatment processes to achieve the high specific wear resistance and mechanical properties. High temperature linear reciprocating wear and friction properties of in-situ centrifugally cast A356-Mg2Si FG-composites has been studied. The wear resistance properties of Al-Mg2Si FG-composites were characterized by difference of initial and final weight measurement after sliding wear test. As a result, the mass loss decreases steadily as the %Mg increases from 2.5% to 7.5% and slightly increases with 10% Mg. The FG-composites containing 7.5%Mg exhibits the remarkable combination of wear resistance characteristics and coefficient of friction. Microstructural features and phases distributions were analyzed with the help of Optical and SEM microscopy. The surface topography of wear test samples were carried out using the Scanning Electron Microscopy (SEM) followed by Energy-dispersive X-ray spectroscopy (EDX) analysis. [ABSTRACT FROM AUTHOR]

Published
2023
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